城市污水处理厂甲烷的释放通量

Methane emissions from municipal wastewater treatment plants

通过对山东省济南市某城市污水处理厂所有处理单元的采样监测,分析研究了污水处理过程中CH4的释放通量。结果表明,该污水处理厂主要的CH4释放单元包括厌氧池、好氧池、缺氧池和二沉池,其中,厌氧池是最主要的CH4释放单元,释放量约占到全厂的50%。经测算,该污水处理厂每年释放CH4约12 600 kg,CH4的人均释放系数为31.5 g/(人.yr),每处理1 t污水释放CH4334.6 mg。COD浓度可能是影响厌氧池CH4产生和释放的重要因素,在实验监测范围内,高COD浓度可能会促进CH4的释放。

Methane（CH4） emissions from all processing units were measured in a full-scale wastewater treatment plant in Jinan.The major sources of CH4 emissions were found to be the following units： anaerobic tanks,oxic tanks,anoxic tanks and secondary settlers.The most significant methane emissions occurred in anaerobic tanks,which accounted for over 50% of the total emissions of this plant.The total annual fluxes of CH4 emissions from the Jinan WWTP were 12 600 kg/yr,with the emission factors of per capita emissions of 31.5 g CH4/person·yr and flow-based emissions of 334.6 mg CH4/ton of wastewater.The most significant factor influencing methane emissions from anaerobic tanks might be COD concentration.High COD concentration could promote methane emissions.