Abstract
Subsurface wastewater infiltration system (SWIS) is an eco-friendly technology treating domestic sewage. On the other hand, SWIS has been found to be a source of nitrous oxide (N2O) emission. Unfortunately, the contribution of different depth layers to N2O emission is still unclear. Therefore, this study sampled N2O samples in different layers using a stratified gas sampler. Three parallel SWISs were operated under low, medium and high hydraulic loads, respectively. The results showed that N2O emission and conversion rate of SWIS were 12.5–27.5 g/m2·y and 0.11–0.35%, respectively. Within the tested loads of 5, 10 and 15 cm/d, the amount of N2O produced decreased as the load increased. SWIS amended with 10% activated sludge degraded nitrogen effectively with effluent quality meeting the first class A standard of the “Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant” (GB/T18918-2002). Under varying influent load strengths, anaerobic zone was the main source for N2O emission. When the hydraulic load increased from 5 cm/d to 15 cm/d, the contributions of anaerobic zone increased from 43.56% to 65.09% for wetting period and from 38.01% to 78.8% for drying period, respectively.
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