Carbon emissions of municipal sludge "deep dehydration-drying-incineration" processes under different sludge preconditioning methods
MA Jian-yun1, LI Zhi1, GU Jun1, WANG Fei2, HOU Bao-lian3, YU Ran1
1. School of Energy and Environment, Southeast University, Nanjing 210096, China; 2. Nanjing Water Group Co. LTD, Nanjing 210000, China; 3. Jiangsu Jinling Environment Co. LTD, Nanjing 210000, China
Abstract：This study developed pilot-scale "deep dehydration-drying-incineration" processes for sludge treatment and disposal with two different preconditioning approaches, i.e., novel sludge biolysis and the conventional chemical agent (iron salt + lime). Then, the carbon emission characteristics of these approaches were analysed and compared according to methods by Intergovernmental Panel on Climate Change (IPCC). The results showed that the moisture contents of dewatered sludge with the plate and frame filter press were both less than 60% no matter which preconditioning method was applied. However, the dry matter contents and the dry basis calorific values of the filter pressed sludges were significantly different. Specifically, the biolysed sludge showed 23.0 % lower dry matter content and 32.1% higher dry basis calorific value as compared with that treated with chemical preconditioning. Based on one cubic meter of raw sludge (RS) with 98% water content, and the total carbon emissions of the sludge "deep dehydration-drying-incineration" process for sludge treatment and disposal with biolysis as pretreatment was 15.8kg CO2eq/m3 RS, which was 41.7% lower than that with the chemical preconditioning process (27.1kg CO2eq/m3 RS).
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