Journal of Environmental Engineering Technology | SinoGreenTech Research Archive

Browse by Publication Year & VolumeReset All Filters ✕

All Years (127)📅 2026(44)127

Select Specific Issue:

44 • 4 44 • 5 44 • 6 44 • 7 44 • 8

Published Research PapersFiltered: Year 2026 • 44 • 6

Showing 22 of 127 peer-reviewed papers with full Graphical Abstracts.

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606014• Jan 15, 2026

Adsorption Behavior of Microplastics for Typical Psychoactive Drugs

Authors: WANG Ruixue, WANG Yuqi, ZHANG Chenglong, XU Yunyun

Microplastics, as emerging environmental pollutants, can adsorb psychotropic drugs in aquatic environments, facilitating their migration and transformation, ultimately posing ecological risks. This study investigated the adsorption behavior and mechanisms of four common microplastics—polyethylene (PE), polypropylene (PP), polystyrene (PS), and polyvinyl chloride (PVC)—each with a particle size of 50 μm, toward three psychoactive drugs: diazepam, fluoxetine, and mianserin. Adsorption kinetics, isotherms, and the effects of pH and salinity were examined. Kinetic data fitted well to a pseudo-second-order model, indicating chemisorption as the rate-limiting step. Isotherm analysis using Langmuir and Freundlich models revealed that PE exhibited the highest affinity for fluoxetine, PP for mianserin, and PVC for diazepam, while PS showed linear adsorption for fluoxetine, suggesting partitioning. The adsorption of diazepam was maximal at pH 6.5–8.5, typical of natural surface waters, and increased with NaCl concentration, indicating that non-electrostatic interactions dominate and that higher ionic strength enhances adsorption. Mechanistic insights suggest that hydrophobic interactions, hydrogen bonding, π-π interactions (for PS), and halogen bonding (for fluoxetine) contribute to adsorption. These findings highlight the potential of microplastics to act as vectors for psychoactive drugs, necessitating further research on their environmental fate and ecological implications.

Read Full Research Article→Download Authentic PDF

Adsorption Behavior of Microplastics for Typical Psychoactive Drugs

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606008• Jan 15, 2026

Research Advances in Resin-Enhanced Electrosorption for Water Treatment

Authors: XIONG Qikun, WANG Xinyi, LIU Weirong, TANG Yingcai, MA Lixin, LIU Baozhen, BAO Huanyu

Resin-enhanced electrosorption for water treatment significantly improves ion adsorption efficiency and selectivity through synergistic effects, making it a research hotspot in the water treatment field. This technology provides an innovative solution to the bottlenecks of kinetic lag and insufficient selectivity by modulating electrode-solution interface behavior in multiple dimensions. Current technological advances include the following: a simple integration method enables desalination efficiency to exceed 92.3%; resin-coated composite electrodes eliminate the co-ion effect and achieve a 42% increase in total salt adsorption capacity; resin-derived porous carbon electrodes with tunable pore structures possess three to five times the adsorption capacity of commercially available activated carbon; and by enhancing solution convection and electrophoretic convection, the resin-filling strategy achieves a high desalination rate of (670 ± 20) mg/(L·h). Studies have demonstrated that different material combinations can achieve targeted optimization of adsorption performance based on specific water quality characteristics. Future research directions may focus on: developing intelligent resin materials with electromagnetic responsiveness; constructing a multi-scale structural design theory for resin-electrode systems; and establishing a cross-scale model integrating electrochemistry, fluid dynamics, and interface science for comprehensive analysis. In particular, in-depth studies are needed on the dynamic behavior of resin-based flow electrodes under electric/magnetic field regulation, as well as the precise construction of catalytic sites on the resin surface. This review aims to promote the widespread application and efficient practice of this technology in water treatment, providing a theoretical foundation and scientific basis for the future development of high-efficiency, selective, and stable electrosorption technologies.

Read Full Research Article→Download Authentic PDF

Research Advances in Resin-Enhanced Electrosorption for Water Treatment

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606007• Jan 15, 2026

Performance and Mechanism of Cobalt-Aluminum Spinel Catalyzed Oxidation of Nitric Oxide

Authors: LIU Baiyun, ZHANG Jianning, ZHANG Yihuai, ZHANG Tao

Cobalt-aluminum spinel metal oxides derived from hydrotalcite were synthesized via hydrothermal, coprecipitation, and sol-gel methods, and their catalytic performance for NO oxidation was systematically evaluated. Characterization by X-ray photoelectron spectroscopy (XPS), O2 temperature-programmed desorption (O2-TPD), H2 temperature-programmed reduction (H2-TPR), and Raman spectroscopy revealed that the synthesis method significantly influences the surface Co2+/Co3+ ratio, which in turn modulates the formation of surface oxygen vacancies. The hydrothermally synthesized catalyst (CoAlO-H) exhibited the highest density of surface oxygen vacancies, leading to enhanced adsorption and activation of gaseous oxygen and superior NO oxidation activity compared to coprecipitation (CoAlO-C) and sol-gel (CoAlO-S) counterparts. Mechanistic studies using NO-TPD, NO+O2-TPD, and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) identified nitrates as key intermediates. Notably, CoAlO-C and CoAlO-S followed the Langmuir-Hinshelwood (L-H) mechanism, whereas CoAlO-H operated via both L-H and Mars-van Krevelen (MvK) mechanisms. The exceptional performance of CoAlO-H is attributed to its abundant surface oxygen vacancies, high surface oxygen mobility, and low decomposition temperature of reaction intermediates. These findings provide a rational basis for designing efficient non-precious metal catalysts for NO oxidation in diesel exhaust aftertreatment.

Read Full Research Article→Download Authentic PDF

Performance and Mechanism of Cobalt-Aluminum Spinel Catalyzed Oxidation of Nitric Oxide

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606013• Jan 15, 2026

Comparative Analysis of CH4 and N2O Generation and Emission Characteristics in A2/O and A2/O-MBR Wastewater Treatment Plants

Authors: SHANG Zhenxin, LIU Jia, GUO Yanli, HUANG Xiangfeng, CAI Chen

The A2/O-MBR process, owing to its superior effluent quality and smaller footprint, is increasingly adopted in newly built and upgraded wastewater treatment plants. However, systematic studies on its greenhouse gas (GHG) emissions remain scarce, and direct comparisons with the conventional A2/O process are lacking. In this study, two full-scale wastewater treatment plants employing the A2/O and A2/O-MBR processes under identical influent conditions, climate, and discharge standards were investigated. A high-frequency monitoring system covering the entire treatment train was established, and combined with measurements of dissolved CH4 and N2O, water quality parameters, and operational parameters, to elucidate the differences in GHG emission characteristics. Results showed that the daily average CH4 emission intensities were not significantly different between the two plants [(0.67 ± 0.22) and (0.65 ± 0.18) g/m3, respectively]. CH4 emissions mainly originated from sewer-derived anaerobic production and subsequent release in the pretreatment units (accounting for over 70% of the total emissions), with partial in-plant oxidation by methanotrophs. Temperature and aeration-induced stripping were identified as key driving factors, as CH4 emissions were positively correlated with ambient temperature and dissolved oxygen (DO). In contrast, more than 90% of N2O emissions occurred in the biological treatment units. The A2/O-MBR plant exhibited significantly higher daily N2O emission intensity [(0.132 ± 0.055) g/m3] than the A2/O plant [(0.060 ± 0.046) g/m3], largely due to intensive aeration and oxygen-enriched internal/external recirculation in the membrane tank, which enhanced N2O production and stripping. Correlation analysis further revealed that N2O emissions in the A2/O plant were positively related to influent COD and BOD5, indicating dominance of heterotrophic denitrification, whereas in the A2/O-MBR process they were mainly driven by NH3-N loading and DO, reflecting a nitrification-based pathway. Importantly, both processes exhibited CH4 and N2O emission factors that were significantly lower than the reference values recommended by the IPCC and industry guidelines, underscoring the necessity of localizing emission factors for accurate carbon accounting.

Read Full Research Article→Download Authentic PDF

Comparative Analysis of CH4 and N2O Generation and Emission Characteristics in A2/O and A2/O-MBR Wastewater Treatment Plants

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606010• Jan 15, 2026

Oxygen-Loaded Porous Materials Inhibit Phosphorus Release at the Sediment-Water Interface in Eutrophic Waters

Authors: LIU Ming, QIU Zile, LU Yang, WANG Ruxue, BAI Lanfeng, XIONG Shuangshuang, SHI Li, DOU Pengpeng

Dissolved oxygen (DO) is a critical factor controlling endogenous phosphorus (P) migration in eutrophic waters. Existing oxygenation technologies suffer from high energy consumption and sediment disturbance, necessitating low-disturbance, pH-stable strategies that avoid additional nitrogen and P loads. This study evaluated an oxygen-loaded porous material (OLPM) for inhibiting sediment P release using laboratory microcosms with natural eutrophic water samples. DO microprofiles across the sediment-water interface (SWI) were measured with microelectrodes; diffusive gradients in thin films (DGT) resolved Fe, S, and P distributions; and sequential extraction quantified sediment P fractions. Results showed that OLPM coverage increased surface sediment DO concentration by 6.58-fold and DO penetration depth by 1.33-fold (16.8 mm). Overlying water total phosphorus (TP) decreased by 93.79%, and sediment interstitial phosphate (PO4-P) decreased by up to 45.75%. The SWI TP exchange flux reversed from +0.0068 mg/(m2·d) to -0.014 mg/(m2·d), shifting the system from a P source to a P sink. Sediment P fractionation revealed a 5.22% increase in stable Res-P and a 4.48% decrease in labile NaHCO3-P. Mechanistically, OLPM enhanced iron oxidation (Fe2+ reduced by 59.62%) and suppressed sulfate reduction (S2- homogenized at low levels), promoting P immobilization via Fe-S coupling. The material effectively inhibits endogenous P release through interfacial DO regulation without altering pH, offering a promising approach for eutrophication management.

Read Full Research Article→Download Authentic PDF

Oxygen-Loaded Porous Materials Inhibit Phosphorus Release at the Sediment-Water Interface in Eutrophic Waters

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606011• Jan 15, 2026

Preparation of Dispersed Iron-Sulfur-Based Nanoparticle Slurry and Its Application in Remediating Cr(VI) Contamination

Authors: XING Ningning, ZHANG Hongling, JIANG Hui, XU Hongbin

Hexavalent chromium (Cr(VI)) contamination in chromite ore processing residue (COPR) and associated soils poses a persistent environmental challenge. This study developed a dispersedly stabilized iron-sulfur-based slurry (DSS-ISB) modified with an inorganic dispersant to enhance nanoparticle suspension stability and interfacial reactivity. The slurry, with a particle size of approximately 200 nm, efficiently reduced and immobilized Cr(VI) without pH adjustment. Under optimal conditions (liquid-to-solid ratio of 5 mL:10 g, DSS-ISB dosage of 1.8 mg/g, reaction time of 20 h), the removal efficiency exceeded 97%, reducing the leaching concentration from 15.03 mg/L to 0.03 mg/L, well below the GB 5085.3—2007 limit of 5 mg/L. X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) analyses revealed a synergistic mechanism of chemical reduction (Fe2+/S2- as dual electron donors) and surface adsorption, converting toxic Cr(VI) to stable Cr(III). Compared with traditional reductants ferrous sulfate (FeSO4) and sodium sulfide (Na2S), DSS-ISB increased removal efficiency by 28.24% and 6.23%, respectively, and unit mass removal capacity by 92.43% and 77.08%. The reagent cost per ton of COPR was reduced to RMB 36.40, achieving savings of 33.82% and 26.02% versus FeSO4 (RMB 55.00) and Na2S (RMB 49.20). The process eliminates pH adjustment and subsequent passivation, simplifying remediation. DSS-ISB offers an economical and green solution for Cr(VI) remediation in both industrial residues and contaminated soils.

Read Full Research Article→Download Authentic PDF

Preparation of Dispersed Iron-Sulfur-Based Nanoparticle Slurry and Its Application in Remediating Cr(VI) Contamination

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606001• Jan 15, 2026

Machine Learning-Based Prediction of Acidogenic Performance in Anaerobic Fermentation of Chemical-Biological Sewage Sludge

Authors: ZHAO Ke, LI Tianle, LIU Changjie, PING Qian

Municipal sludge anaerobic resource recovery efficiency in China lags behind developed countries. Widespread chemical phosphorus removal increases iron and aluminum salt precipitates in waste activated sludge, forming chemical-biological sludge that reduces acidogenic efficiency. This study identified key factors and developed a high-precision prediction model. Integrating literature and experimental data, acidogenic performance indicators under various conditions were compiled. Five machine learning models—Backpropagation Neural Network, Adaptive Neuro-Fuzzy Inference System, Support Vector Machine, K-Nearest Neighbors, and Random Forest—were systematically compared. Random Forest achieved the best predictive performance with a test set coefficient of determination (R²) of 0.9463, significantly outperforming others with minimal overfitting risk, demonstrating strong capability for high-dimensional, nonlinear, multi-factor coupled problems. Feature importance analysis revealed pH and Volatile Suspended Solids (VSS) as primary drivers, with aluminum salts exerting greater influence than iron salts. Engineering optimization should follow the pathway: 'adjust pH, stabilize organic matter, control aluminum salts'. This study provides an intelligent predictive tool and clarifies optimization directions, advancing precision and intelligent sludge treatment.

Read Full Research Article→Download Authentic PDF

Machine Learning-Based Prediction of Acidogenic Performance in Anaerobic Fermentation of Chemical-Biological Sewage Sludge

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606006• Jan 15, 2026

Recent Progress in Chitosan-Based Microsphere Composites for Phosphorus Removal from Aqueous Environments

Authors: LIU Shuai, LI Yingjie, HONG Changhong, LIU Da, ZHANG Shenghao

Chitosan-based microsphere composites have attracted considerable attention for phosphorus adsorption due to their facile preparation, low cost, environmental friendliness, and high uptake capacity. This review summarizes the physicochemical properties and preparation methods of chitosan microspheres for phosphate removal, outlines common modification strategies to enhance adsorption capacity, and discusses their applications in aqueous environments. Adsorption mechanisms, regeneration, and resource recovery of spent microspheres are analyzed. Challenges and recommendations are proposed, including streamlined preparation, enhanced phosphorus recovery, removal of multiple phosphorus forms, and practical implementation. The review aims to guide the development of high-performance chitosan-based microspheres for phosphorus removal.

Read Full Research Article→Download Authentic PDF

Recent Progress in Chitosan-Based Microsphere Composites for Phosphorus Removal from Aqueous Environments

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606004• Jan 15, 2026

Environmental Impact and Cost Analysis of Ecological Buffer Zones from an LCA-LCC Perspective

Authors: SHI Wanxian, XIONG Lijun, GUO Fei, LEI Jingcheng, XU Kangning

To identify optimal watershed remediation pathways under environmental and economic dimensions, an integrated environmental-economic impact assessment framework combining life cycle assessment (LCA) and life cycle costing (LCC) based on openLCA was established, using 1 m³ of treated wastewater as the functional unit. This framework comprehensively evaluated the environmental impacts and economic costs of three ecological buffer measures—constructed wetlands, ecological intercepting ditches, and vegetation restoration projects—in non-point source pollution control. The results indicated that constructed wetlands offer the optimal environmental-economic profile, featuring the lowest comprehensive cost (¥1.01 yuan/m³) and the lowest load across most environmental impact categories, with only slightly higher land resource consumption intensity. Ecological intercepting ditches exhibited higher impacts in areas such as metal resource consumption due to the use of rebars and base fertilizer inputs, resulting in a moderate comprehensive cost (¥1.57 yuan/m³). Vegetation restoration projects incurred the highest comprehensive cost (¥61.14 yuan/m³) and produced the most significant environmental impacts, with elevated indicators such as human carcinogenic toxicity. This primarily stemmed from the extensive use of concrete grass pavers and base fertilizer in rural river sections. These findings provide quantitative references for environmental-economic integrated evaluation and decision-making regarding ecological buffer zone engineering schemes in similar watersheds.

Read Full Research Article→Download Authentic PDF

Environmental Impact and Cost Analysis of Ecological Buffer Zones from an LCA-LCC Perspective

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606009• Jan 15, 2026

High-Temperature Dechlorination Performance of Solid Waste-Based Dechlorination Agents

Authors: WANG Xuening, LI Hui, HU Yingying, GOU Yujin, CAO Taiyu, QI Yongle, ZHENG Wukui

The escalating volume of municipal solid waste in China necessitates effective disposal strategies. Industrial kiln co-processing offers a promising route, but high-temperature decomposition of chlorinated components releases HCl and Cl2, causing severe equipment corrosion and operational issues. This study investigates the high-temperature dechlorination performance of fly ash and red mud, two abundant industrial solid wastes, as potential dechlorination agents. Using a high-temperature tube furnace system, dechlorination efficiencies were evaluated across 600–900 °C. At 700 °C, fly ash achieved a peak dechlorination efficiency of 93.33%, while red mud reached 88.61%. However, efficiencies declined with further temperature increase, dropping to 65.6% and 58.27% at 900 °C for fly ash and red mud, respectively. To enhance performance at higher temperatures, fly ash was modified via alkali (NaOH) treatment. The modification increased surface roughness and porosity, disrupted Si-O-Si and Si-O-Al networks, and exposed active sites. Consequently, the alkali-modified fly ash exhibited a peak dechlorination efficiency of 94.98% at 800 °C, a 23.08% improvement over unmodified fly ash (71.9%). These findings demonstrate the technical feasibility of utilizing solid wastes as dechlorination agents, offering a dual benefit of waste valorization and cost-effective high-temperature gas purification. The study provides a foundation for scaling up this approach in industrial kiln applications, contributing to sustainable waste management and reduced environmental impact.

Read Full Research Article→Download Authentic PDF

High-Temperature Dechlorination Performance of Solid Waste-Based Dechlorination Agents

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606005• Jan 15, 2026

Establishment of a Carbon Emission Balance Model and Analysis of Carbon Neutrality Pathways for Urban Reclaimed Water Plants

Authors: PANG Hongtao, HOU Feng, ZHU Ke, ZHANG Lujing, LI Peng, JIANG Leyong, SUN Shihao

In the context of carbon peaking and carbon neutrality, urban reclaimed water plants must adopt measures such as energy conservation, consumption reduction, and enhanced resource and energy utilization to achieve carbon neutrality. This study developed a carbon emission balance model and accounting method for such plants, incorporating strategies of carbon emission reduction, carbon substitution, and carbon sink. The optimal pathway towards carbon neutrality was evaluated based on the carbon emission balance ratio. Using a 1×10⁵ m³/d urban reclaimed water plant as a case study, the results showed total carbon emissions of 20,934 t CO2e. The carbon emission reduction from reclaimed water source heat pumps for heating and cooling was 21,701 t CO2e, yielding a carbon emission balance ratio of 103.7%. In contrast, other carbon reduction measures contributed 15,424 t CO2e, with a balance ratio of 73.7%, highlighting the pivotal role of reclaimed water source heat pumps. When the heat pump extracted 27% and 36% of residual thermal energy, coupled with reclaimed water reuse or sludge anaerobic digestion-cogeneration, respectively, both pathways achieved a 100% balance ratio. Assuming year-round extraction, the balance ratio reached 213%. The carbon reduction ratio between utilizing residual thermal energy and chemical energy was 8.76:1. This study demonstrates that urban reclaimed water plants can achieve carbon neutrality through multiple pathways, with residual thermal energy recovery exhibiting significant potential.

Read Full Research Article→Download Authentic PDF

Establishment of a Carbon Emission Balance Model and Analysis of Carbon Neutrality Pathways for Urban Reclaimed Water Plants

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606002• Jan 15, 2026

Whole-Process Management and Intelligent Monitoring System for VOCs Emissions in Rubber Paste Preparation Workshops: Design, Implementation, and Field Validation

Authors: LI Peixian, DANG Xiaoqing, ZHAI Chen, HAN Wei, LAI Zhiqiang, LI Zhaoyang, QU Jiaxin, WANG He, ZHENG Huachun

Industrial volatile organic compounds (VOCs) emissions are a major contributor to regional air pollution, and the rubber paste preparation process is a significant source. This study developed an intelligent monitoring system for whole-process VOCs management in a rubber paste preparation workshop, integrating software engineering and Internet of Things (IoT) technologies. The system architecture combines a hybrid database (MySQL relational and InfluxDB time-series), MQTT-based low-power wide-area communication, role-based access control, and containerized microservices. Field deployment at a large rubber enterprise enabled real-time monitoring of adsorption/desorption centrifugal fans and data fusion analysis. Under typical operating conditions, the extraction and ventilation systems achieved volume flow rates of 40,000 m³/h and 30,000 m³/h, respectively, maintaining a continuous micro-negative pressure environment that effectively suppressed fugitive emissions. The purification process, comprising zeolite rotor adsorption and regenerative thermal catalytic oxidation, reduced non-methane hydrocarbon (NMHC) concentrations to below 10 mg/m³, meeting the GB 27632—2011 emission standard. The system's multi-level permission management module precisely allocated operational responsibilities across production, environmental, and management roles, reducing response time to abnormal conditions. An online evaluation model for purification efficiency was constructed based on the actual process. The system demonstrates potential for extension to other high-VOCs industries such as coatings and printing. This research provides theoretical and practical references for applying computer technology to VOCs reduction and whole-process management in typical industries.

Read Full Research Article→Download Authentic PDF

Whole-Process Management and Intelligent Monitoring System for VOCs Emissions in Rubber Paste Preparation Workshops: Design, Implementation, and Field Validation

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606003• Jan 15, 2026

Machine Learning-Driven Development of Membrane Materials for Optimized Lithium Recovery Performance

Authors: WEI Jiaqi, CHEN Hao, ZHANG Jiahui, CHENG Xue, ZHANG Xuehong, LI Haixiang, ZHENG Junjian

Membrane separation technology, offering high separation efficiency, low energy consumption, and operational flexibility, is promising for lithium recovery. However, selective lithium extraction from complex matrices such as salt lake brines and battery leachates remains challenging. Traditional membrane development relies on empirical trial-and-error, suffering from low efficiency and the permeability-selectivity trade-off. This review systematically delineates machine learning (ML)-based frameworks for membrane material development, including high-throughput rational screening, inverse design of synthesis protocols, and high-fidelity performance prediction. We elucidate how advanced ML algorithms decipher structure-activity relationships at the molecular level, enabling breakthroughs in performance ceilings and guiding bottom-up fabrication of next-generation membranes. Critical challenges are assessed: scarcity of high-quality standardized datasets, limited model interpretability, and poor generalizability to industrial scales. Future directions emphasize physics-informed hybrid models, open-source global databases, and full-process system optimization to bridge laboratory innovation and industrial deployment.

Read Full Research Article→Download Authentic PDF

Machine Learning-Driven Development of Membrane Materials for Optimized Lithium Recovery Performance

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606012• Jan 15, 2026

Pollution Status of River and Lake Sediments and Research Progress in In-situ Remediation Technologies

Authors: DONG Yanting, YANG Jie, ZHU Nanwen, WANG Yan

River and lake sediments, as both sources and sinks of water pollutants, significantly impact overlying water quality and aquatic ecosystems. In pollution treatment and ecological restoration, managing contaminated sediments is critical. Remediation technologies are categorized into ex-situ and in-situ methods; in-situ techniques have gained prominence due to lower costs and minimal environmental disturbance. This review summarizes sediment pollution status, comprehensively examines physical, chemical, biological, and combined in-situ remediation technologies, and discusses their mechanisms, applications, and future research needs. It proposes optimization strategies for emerging technologies, material improvements, and pathways for sustainable development, emphasizing interdisciplinary integration to enhance remediation efficacy. Key pollutants include heavy metals (e.g., Cd, Hg), persistent organic pollutants (POPs), and emerging contaminants like antibiotics and microplastics. In-situ methods such as capping, chemical oxidation, and bioremediation show promise but face challenges in long-term stability and scalability. The paper underscores the need for sustainable, cost-effective solutions and highlights recent advances in combined technologies, offering a reference for future research and engineering applications.

Read Full Research Article→Download Authentic PDF

Pollution Status of River and Lake Sediments and Research Progress in In-situ Remediation Technologies

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606015• Jan 15, 2026

Resource Recovery of Corn Stover in Water Treatment: Nitrate Removal from Simulated Groundwater

Authors: WANG Lina, CHEN Lirong, MA Kun, JIA Biao, WANG Zhen

This study evaluated the sustainability and tissue-specific mechanisms of corn stover as a solid-phase carbon source for nitrate removal from groundwater. Cyclic heterotrophic denitrification experiments were conducted using leaf, stem pith, stem bark, stem node, husk, and mixed tissues as carbon sources. Denitrification efficiency, sustainability, dissolved organic carbon (DOC) release, carbon utilization efficiency, intermediate accumulation, and environmental parameters were systematically assessed. Kinetic modeling, correlation analysis, and structural equation modeling (SEM) were applied to elucidate regulatory mechanisms. Results demonstrated that mixed tissues and husk achieved the highest denitrification efficiency, with nitrate removal rates consistently above 98% across four repeated cycles. Total nitrogen removal reached 39.30 mg/g for mixed tissues and 39.95 mg/g for husk, while byproduct concentrations (NO2-N and NH4-N) remained below 2 mg/L. DOC release profiles indicated stable carbon release and high carbon utilization efficiency (203.99 mg TN/g organic carbon for mixed tissues; 182.41 mg/g for husk). Correlation and SEM analyses revealed that carbon source type indirectly governed total nitrogen removal by modulating DOC release, which subsequently influenced pH, electrical conductivity, and nitrogen transformation pathways. Significant differences among tissues were observed in denitrification efficiency, carbon utilization, and micro-environmental regulation. Mixed tissues and husk emerged as superior carbon sources due to their combined efficiency and stability. However, husk released odorous compounds during operation, posing sensory challenges for practical application. The findings support the potential of corn stover tissues as cost-effective carbon sources for in-situ groundwater nitrate remediation, though further optimization is required for field-scale implementation.

Read Full Research Article→Download Authentic PDF

Resource Recovery of Corn Stover in Water Treatment: Nitrate Removal from Simulated Groundwater

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606019• Jan 15, 2026

Characterization of Dust Characteristics from Sludge Co-combustion in Coal-fired Units and Experimental Study on Retrofit of Pneumatically Rapped ESP

Authors: ZHAO Haibao, TANG Zhichang, WANG Shaoquan, XIE Jie, XU Jianli

Sludge co-combustion in coal-fired power plants generates flue gas dust with high viscosity, causing severe dust deposition on downstream environmental protection equipment. This study analyzed the dust deposition mechanism in electrostatic precipitators (ESPs) and characterized the dust layer properties. Results indicated that sludge co-combustion increased flue gas moisture content, altered particle morphology, and elevated dust viscosity. To address these issues, an anode pneumatically rapped ESP technology was developed to enhance anode plate cleaning. This technology was retrofitted on a 1000 MW unit at Zhejiang Jiahua Power Plant, and performance tests under sludge co-combustion conditions were completed in February 2025. At a specific dust collection area of 118 m²·s/m³ and a unit load of 987 MW, the ESP outlet dust concentration decreased from 25.32 mg/m³ before retrofit to 7.95 mg/m³ after retrofit. Analysis revealed that sludge co-combustion caused excessive dust deposition on the first electric field anode plates, inducing back corona, high-voltage power supply flashover, and low secondary voltage and current. After retrofit, regions with low rapping acceleration were eliminated, achieving effective dust cleaning. Secondary voltage and current were significantly improved, and overall ESP efficiency was remarkably enhanced. The proposed technology provides a reference for ESP retrofitting of coal-fired units under biomass (sludge) co-combustion and low-load conditions.

Read Full Research Article→Download Authentic PDF

Characterization of Dust Characteristics from Sludge Co-combustion in Coal-fired Units and Experimental Study on Retrofit of Pneumatically Rapped ESP

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606020• Jan 15, 2026

Operational Efficiency and Fouling Mechanism of a Novel Swinging Ultra-Fine Screen

Authors: CHENG Yuantao, ZHANG Zongsheng, ZHANG Jie, WU Zhichao, ZANG Lili

Municipal wastewater treatment plants in China face excessive influent grit loads and carbon source deficiencies, while conventional pretreatment (screening, grit chambers, primary sedimentation) exhibits low fine grit removal and poor carbon retention. A novel swinging ultra-fine screen with a screening precision of 0.1 mm was developed and tested at a pilot scale of 1000 m³/d. Systematic evaluation of screens with apertures from 0.05 to 0.4 mm was conducted, with mechanisms analyzed via particle size distribution, COD fractionation, and fouling layer characterization. The 0.1 mm screen achieved an SS removal efficiency of 89.3%, significantly higher than 57.4% for conventional processes, while COD removal was only 9.5% versus 28.6%, corresponding to a carbon source retention of 93%. The device nearly completely retained particles >0.1 mm and achieved >98% removal for particles in the 0.075–0.1 mm range. Performance remained stable under fluctuating COD and SS conditions. A three-stage fouling theory for micro-screens was proposed. This work represents the first application of 0.1 mm screening precision in pretreatment, markedly improving fine grit retention and carbon source preservation, with strong resilience to water quality variations.

Read Full Research Article→Download Authentic PDF

Operational Efficiency and Fouling Mechanism of a Novel Swinging Ultra-Fine Screen

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606016• Jan 15, 2026

Mechanism of Desulfurization Pretreatment of Barium-Containing Waste Slag by Calcium Carbonate Precipitation Method

Authors: YANG Dan, LI Chen, WU Hanzhang, PENG Jiyi, GONG Zihao, YU Zhiyuan

Barium slag, a solid waste from barium salt production, poses environmental risks due to high sulfur and soluble barium content. This study investigated the desulfurization of barium slag using sodium carbonate (Na2CO3) as a precipitating agent. The effects of reaction temperature, time, and Na2CO3 concentration on desulfurization efficiency were systematically evaluated. X-ray diffraction (XRD) and scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS) were employed to analyze phase transformations and microstructural evolution. Results showed that desulfurization primarily proceeds via the reaction of ettringite (Ca6(Al(OH)6)2(SO4)3·26H2O) with Na2CO3, forming calcium carbonate (CaCO3) precipitates. However, the precipitated CaCO3 accumulates on ettringite surfaces, hindering further reaction. Under optimal conditions (60 °C, 5 h, 2 mol/L Na2CO3), the desulfurization efficiency reached 91.21%, reducing sulfur content in the slag to 0.27%, meeting the HJ 662—2013 standard for cement kiln co-processing. This work provides a mechanistic basis for efficient and environmentally sound treatment of barium slag, supporting its resource utilization in cement production.

Read Full Research Article→Download Authentic PDF

Mechanism of Desulfurization Pretreatment of Barium-Containing Waste Slag by Calcium Carbonate Precipitation Method

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606022• Jan 15, 2026

Numerical Simulation of Airflow Distribution and Structural Optimization of a VOCs Catalytic Combustion Reactor

Authors: HOU Yuxin, YI Tianli, XIAO Hailin, OU Yangming, LIU Peng, FU Mingli

This study presents a numerical simulation of the internal flow field in a volatile organic compounds (VOCs) catalytic combustion reactor used in an enameled wire enterprise. Using ANSYS Fluent, the effects of inlet expansion section length, inlet expansion section angle, and catalyst bed spacing on the velocity field were systematically investigated. Additionally, the influence of heating tube configuration on the temperature field was analyzed. The results indicate that an expansion section length of 250 mm is optimal, balancing spatial constraints and the avoidance of recirculation zones. A zero-degree expansion angle yields the most uniform velocity distribution, though practical considerations necessitate case-specific angle selection. A catalyst bed spacing of 0.05 m satisfies the engineering requirement of maintaining pressure drop across a single catalyst layer below 200 Pa while significantly improving gas distribution within the bed. Alternating heating tubes on both sides of the reactor enhance temperature uniformity and elevate the overall catalyst bed temperature, thereby promoting efficient VOCs catalytic combustion. These findings provide quantitative guidance for reactor design optimization, contributing to improved catalytic performance and extended catalyst lifespan.

Read Full Research Article→Download Authentic PDF

Numerical Simulation of Airflow Distribution and Structural Optimization of a VOCs Catalytic Combustion Reactor

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606018• Jan 15, 2026

Comparative Study on Hydrogen Production Characteristics of Pre-treated Swine Wastewater in ASBR Process

Authors: SUN Jian, YANG Zhipeng, ZHANG Dongmei, ZHANG Ling, WANG Haoyu, ZHONG Jiaxing, WANG Xiaoling, DU Juli

Swine wastewater, a high-strength organic effluent, offers a viable substrate for anaerobic biohydrogen production, aligning with clean energy recovery. This study compared hydrogen production in three anaerobic sequencing batch reactors (ASBRs) treating: raw wastewater (R1), supernatant after MAP (magnesium ammonium phosphate) precipitation for nitrogen and phosphorus recovery (R2), and the same supernatant with anaerobic sludge heat-treated at 75°C for 0.5 h (R3). Without pH adjustment, hydrogen production in R1 remained below 0.50 mmol/(kg·d). At an influent COD of 1800 mg/L, R2 and R3 achieved hydrogen production rates of 48.17 and 71.44 mmol/(kg·d), respectively. At COD 2400 mg/L, methane concentrations in R1, R2, and R3 were 10.8%, 14.2%, and 9.1%, respectively, indicating MAP pretreatment enhanced both hydrogen and methane production. As COD increased, R1's methane concentration rose to 14.6%, while average COD removal efficiencies for R1, R2, and R3 were 78.9%, 70.8%, and 52.5%, respectively. Under pH adjustment, all reactors peaked at pH 4.0, with hydrogen production rates of 0.10, 7.74, and 8.83 mol/(kg·d) for R1, R2, and R3, respectively. These findings demonstrate that MAP pretreatment combined with sludge heat treatment significantly enhances biohydrogen production, offering a promising strategy for swine wastewater valorization.

Read Full Research Article→Download Authentic PDF

Comparative Study on Hydrogen Production Characteristics of Pre-treated Swine Wastewater in ASBR Process

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606017• Jan 15, 2026

Interpretation of the Revision to the Regenerated Zinc Raw Material Standard: A Perspective on Resource Circulation and Low-Carbon Development

Authors: ZHANG Kewei, CHENG Yong, FENG Junli, JIANG Linhua, HE Hongping

Against the backdrop of global green transition and tightening resource constraints, China's Dual Carbon Goals and Zero-Waste City initiative have positioned waste valorization as a critical pathway for sustainable development. Zinc, a fundamental metal, faces high external dependence and nearing primary resource limits, making the regenerated zinc industry essential. However, the previous standard YS/T 1093-2015 lagged in classification, technical indicators, and environmental requirements. This paper analyzes the revision to YS/T 1093-2024, which renames the standard to 'Recycled Zinc Raw Materials' and clarifies its role as front-end smelting intermediate feedstock. The new standard establishes a classification system covering six typical zinc-bearing materials, expanding utilization of low-grade complex materials (zinc content 5%-15%). It tightens limits on harmful elements (fluorine, chlorine, lead, arsenic) and introduces moisture control and appearance evaluation indicators, enhancing operability and environmental risk control. Compared with EU standards, it shows systematic improvements in raw material coverage, process adaptability, and environmental risk prevention. The revision is expected to drive the regenerated zinc industry toward intensification, high-value utilization, and clean production, improving resource recycling efficiency and supporting China's zinc resource strategic security and low-carbon development.

Read Full Research Article→Download Authentic PDF

Interpretation of the Revision to the Regenerated Zinc Raw Material Standard: A Perspective on Resource Circulation and Low-Carbon Development

Graphical Abstract

Original ResearchVol. 44, Issue 6 • pp. 100-112DOI: 10.13205/j.hjgc.202606021• Jan 15, 2026

Construction and Application Analysis of Overall Energy System for Regenerative Thermal Oxidizers (RTOs)

Authors: WEI Ziqiang, LU Zhaoyang, QU Xiaolei, LI Ming, XU Zunzhu, CHEN Hongrui, CHEN Weijie

To provide a theoretical basis for energy-saving combustion of regenerative thermal oxidizers (RTOs), this study analyzes energy nodes during RTO operation, refines heat balance accounting, and establishes an overall energy system. Taking a three-chamber RTO as the research object, the enthalpy of exhaust gas at different stages is calculated, and a whole-process heat balance model is developed to systematically analyze exhaust gas preheating, combustion, heat recovery, and heat loss transfer. An improved energy accounting method is proposed to address dynamic heat exchange inside heat accumulators, coupling of multiple gas streams, and boundary heat loss under complex conditions. The longitudinal temperature distribution function of heat accumulators is introduced to overcome difficulties in heat accounting within the accumulator chamber. A thermodynamic system covering 11 key internal energy nodes is constructed. Combined with design characteristics of RTO operation across industries, the application scope of the overall energy system is analyzed; equilibrium terms can be adjusted according to actual conditions, ensuring wide applicability. Validation via an RTO energy system for a glove manufacturing plant demonstrates that outlet temperature prediction accuracy improves from 14.3% to 2.8%, providing a theoretical foundation for future intelligent energy-saving combustion research.

Read Full Research Article→Download Authentic PDF

Construction and Application Analysis of Overall Energy System for Regenerative Thermal Oxidizers (RTOs)

Graphical Abstract