猪场污水高氨氮负荷处理过程中温室气体的排放特征

为探讨畜禽养殖污水高氨氮负荷处理过程中的温室气体排放，本试验对缺氧/好氧(A/O)中试工程处理猪场沼液过程进行采样，对温室气体特性及影响因素进行了监测分析。结果表明：A/O工艺CH₄平均排放通量为1 454.76 mg·m^-2·h^-1，平均排放因子为0.85%，缺氧池排放占比最高，占总排放量的56.0%;N₂O平均排放通量为101.25 mg·m^-2·h^-1，平均排放因子为0.64%，好氧池排放占比最高，占总排放量的87.1%。NO₂^--N的积累会促使N₂O排放，但对CH₄排放有抑制作用。硝化细菌和反硝化细菌的反硝化反应可能是猪场污水处理过程中N₂O的主要排放途径。

Greenhouse gas emissions during the treatment of swine wastewater with high ammonia

To explore the greenhouse gas emissions during livestock wastewater treatment processes under a high ammonia loading rate, this study sampled the anoxic/aerobic(A/O) process during the treatment of swine digestate at the pilot scale. We monitored the characteristics of GHG emissions and analyzed the influencing factors. The results indicated that the CH₄ emission flux of the A/O process was 1 454.76 mg·m^-2·h^-1 and the emission factor was 0.85%. The largest source of CH₄ emissions was the anoxic tank, accounting for 56.0% of the total emissions. The N₂O emission flux was 101.25 mg·m^-2·h^-1 and the N₂O emission factor was 0.64%. The largest source of N₂O emissions was the aerobic tank, accounting for 87.1%. An accumulation of NO₂^--N contributes to N₂O emissions but inhibits CH₄ emissions. The denitrification reactions of nitrifying bacteria and denitrifying bacteria may be the main emission pathways of N₂O during the treatment of swine wastewater.