Bani Shahabadi M, Yerushalmi L, Haghighat F
Department of Building, Civil and Environmental Engineering, Concordia University, 1455 de Maissonnuve Blvd. West, Montreal, QC H3G 1M8, Canada.
Water Res. 2009 Jun;43(10):2679-87. doi: 10.1016/j.watres.2009.02.040. Epub 2009 Mar 11.
The overall on-site and off-site greenhouse gas emissions by wastewater treatment plants (WWTPs) of food processing industry were estimated by using an elaborate mathematical model. Three different types of treatment processes including aerobic, anaerobic and hybrid anaerobic/aerobic processes were examined in this study. The overall on-site emissions were 1952, 1992, and 2435 kg CO2e/d while the off-site emissions were 1313, 4631, and 5205 kg CO2e/d for the aerobic, anaerobic and hybrid treatment systems, respectively, when treating a wastewater at 2000 kg BOD/d. The on-site biological processes made the highest contribution to GHG emissions in the aerobic treatment system while the highest emissions in anaerobic and hybrid treatment systems were obtained by off-site GHG emissions, mainly due to on-site material usage. Biogas recovery and reuse as fuel cover the total energy needs of the treatment plants for aeration, heating and electricity for all three types of operations, and considerably reduce GHG emissions by 512, 673, and 988 kg CO2e/d from a total of 3265, 6625, and 7640 kg CO2e/d for aerobic, anaerobic, and hybrid treatment systems, respectively. Considering the off-site GHG emissions, aerobic treatment is the least GHG producing type of treatment contrary to what has been reported in the literature.
利用一个精细的数学模型估算了食品加工业污水处理厂的总体现场和场外温室气体排放量。本研究考察了三种不同类型的处理工艺，包括好氧、厌氧和厌氧/好氧混合工艺。当处理2000千克/日生化需氧量的废水时，好氧、厌氧和混合处理系统的总体现场排放量分别为1952、1992和2435千克二氧化碳当量/日，而场外排放量分别为1313、4631和5205千克二氧化碳当量/日。在好氧处理系统中，现场生物过程对温室气体排放的贡献最大，而在厌氧和混合处理系统中，最高排放量来自场外温室气体排放，主要是由于现场材料使用。沼气回收并作为燃料再利用满足了所有三种类型运行的处理厂的曝气、加热和电力的总能源需求，并分别使好氧、厌氧和混合处理系统的温室气体排放量从总共3265、6625和7640千克二氧化碳当量/日大幅减少512、673和988千克二氧化碳当量/日。考虑到场外温室气体排放，与文献报道相反，好氧处理是产生温室气体最少的处理类型。
