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 NO-2-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.
关键词
温室气体排放/畜禽养殖污水/污水处理/甲烷/氧化亚氮/高氨氮负荷
Key words
greenhouse gas emissions/livestock wastewater/wastewater treatment/methane/nitrous oxide/high ammonia loading rate
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万方数据