Greenhouse gases emissions accounting for typical sewage sludge digestion with energy utilization and residue land application in China |
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| Authors: | Dong-jie Niu Hui Huang Xiao-hu Dai You-cai Zhao |
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| Institution: | 1. Key Laboratory of Yangtze Aquatic Environment, Ministry of Education, College of Environmental Science and Engineering of Tongji University, 1239 Siping Road, Shanghai 200092, PR China;2. National Engineering Research Center for Urban Pollution Control, Shanghai 200092, PR China;3. UNEP-Tongji Institute of Environment for Sustainable Development, 1239 Siping Road, Shanghai 200092, PR China |
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| Abstract: | About 20 million tonnes of sludge (with 80% moisture content) is discharged by the sewage treatment plants per year in China, which, if not treated properly, can be a significant source of greenhouse gases (GHGs) emissions. Anaerobic digestion is a conventional sewage sludge treatment method and will continue to be one of the main technologies in the following years. This research has taken into consideration GHGs emissions from typical processes of sludge thickening + anaerobic digestion + dewatering + residue land application in China. Fossil CO2, biogenic CO2, CH4, and avoided CO2 as the main objects is discussed respectively. The results show that the total CO2-eq is about 1133 kg/t DM (including the biogenic CO2), while the net CO2-eq is about 372 kg/t DM (excluding the biogenic CO2). An anaerobic digestion unit as the main GHGs emission source occupies more than 91% CO2-eq of the whole process. The use of biogas is important for achieving carbon dioxide emission reductions, which could reach about 24% of the total CO2-eq reduction. |
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