Research Progress on Side-Stream Enhanced Biological Phosphorus Removal Process for Achieving Efficient Phosphorus Removal
The challenge of limited phosphorus removal efficiency in low-carbon municipal wastewater is addressed by the innovative side-stream enhanced biological phosphorus removal (S2EBPR) process, which has garnered significant attention. Recent research highlights the core mechanism rooted in the metabolic traits of phosphorus accumulating organisms (PAOs), pivotal for effective phosphorus removal. However, conventional enhanced biological phosphorus removal (EBPR) processes face constraints under low C/P conditions, where the scarcity of carbon source weakens PAOs’ competitive edge, directly impeding phosphorus removal efficiency. Consequently, S2EBPR establishes a side-stream sludge fermentation unit, through which anaerobic fermentation conditions are precisely regulated and PAOs’ dominant position in carbon source competition is strengthened, thereby enhancing the enrichment of PAOs and the optimization of their metabolism. This breakthrough not only overcomes the low C/P limitation but also underscores the fundamental advantage of S2EBPR. Furthermore, the discussion delves into the critical operational and environmental parameters influencing its efficacy, offering a foundation for precise process management. Looking ahead, the synergistic development of S2EBPR alongside emerging water treatment technologies holds promise for simultaneously efficient nitrogen and phosphorus removal in wastewater treatment, thereby furnishing technical insights for fostering sustainable resource recycling practices.