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| Influences of biochar on greenhouse gas emissions during municipal sludge composting |
| Received:September 09, 2017 |
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| KeyWord:municipal sludge;composting;greenhouse gas;biochar;emission characteristics |
| Author Name | Affiliation | E-mail | | YANG Yu-han | College of Resources and Environment, Southwest University, Chongqing 400715, China | | | YI Jian-ting | College of Resources and Environment, Southwest University, Chongqing 400715, China | | | REN Xiao-yu | Hainan Provincial Research Academy of Environmental Sciences, Haikou 570206, China | | | JIANG Yue | College of Resources and Environment, Southwest University, Chongqing 400715, China | | | CHEN Hong | College of Resources and Environment, Southwest University, Chongqing 400715, China | | | ZHANG Cheng | College of Resources and Environment, Southwest University, Chongqing 400715, China | zhcheng@126.com |
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| Abstract: |
| Effects of biochar on greenhouse gas emissions were investigated by analyzing the dynamic characteristics of municipal sludge composting with and without biochar. The results showed that adding biochar increased the pile temperature, extended the altithermal temperature period, increased the decomposition rate of the composting pile, and reduced total carbon(TC), total organic carbon(TOC), and nitrogen loss(especially for NH4+-N). The TC, TOC, and total nitrogen(TN) levels showed significant differences(P<0.05) between the two treatments. CH4 emissions mainly occurred during the altithermal temperature period and cooling phase in both the treatments, accounting for 76.40%~82.40% of the total emissions. Biochar increased the CH4 emissions, but this increase was non-significant compared with composting without biochar. CO2 emissions were primarily concentrated in the altithermal temperature period and cooling phase, accounting for 78.77%~78.83% of the total CO2 emissions. Unlike CH4 emissions, biochar reduced CO2 emissions. In addition, over 84% N2O emissions occurred in the rotten period. Biochar significantly reduced the N2O emissions, which were 18.94% lower than the treatment without biochar. CO2 emission equivalents of dry sludge were estimated to be 60.21 and 67.19 kg·t-1 in the with and without biochar treatments, respectively. The significant reduction in greenhouse gas emissions of 10.39% in the biochar treatment indicated that adding biochar reduced the greenhouse effect during sludge composting. |
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