• • Post-optimization, NOx hourly average concentration decreased from 315.00 mg·m−3 to 181.69 mg·m−3 (42.3% reduction), and CO from 209.57 mg·m−3 to 73.46 mg·m−3 (65.0% reduction), with exceedance hours dropping from 59.52% to 8.93% for NOx and from 83.33% to 5.99% for CO, demonstrating enhanced combustion control and pollutant suppression.
• • The dual-combustion-chamber design (primary pyrolysis at 550–650 °C, secondary oxidation above 900 °C) enables stable gasification of low-calorific MSW (3,800–5,800 kJ·kg−1) with high moisture content (20–35%), addressing the bottleneck of small-scale facilities in cold regions.
• • In-situ leachate recirculation achieved complete on-site leachate disposal under the project's leachate yield, without significant adverse effects on combustion conditions, providing a cost-effective alternative to external leachate treatment and reducing secondary pollution risks.
• • The system achieved continuous stable operation with an 80 t·d−1 capacity, and all monitored gaseous pollutants met national emission standards, validating the engineering optimization for county-level MSW treatment in arid and cold regions.