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| Effect of Adding Coarse Materials from Matured Compost on Greenhouse Gas Emissions from Organic Wastes During Composting |
| Received:March 06, 2015 |
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| KeyWord:greenhouse gas;ammonia;composted coarse material;matured compost;composting |
| Author Name | Affiliation | E-mail | | JIANG Tao | College of Chemistry, Leshan Normal University, Leshan 614004, China
College of Resources and Environment Sciences, China Agricultural University, Beijing 100094, China | | | LI Guo-xue | College of Resources and Environment Sciences, China Agricultural University, Beijing 100094, China | ligx@cau.edu.cn | | TANG Qiong | College of Chemistry, Leshan Normal University, Leshan 614004, China | | | MA Xu-guang | College of Chemistry, Leshan Normal University, Leshan 614004, China | | | WANG Gang | College of Chemistry, Leshan Normal University, Leshan 614004, China | |
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| Abstract: |
| Greenhouse gas emissions often occur during organic waste composting. However, covering the wastes with matured composts may reduce greenhouse gas emissions. In the present study, a mixed material of pig feces and corn stalks(7:1 by wet weight) were composted in 1.2 m3 rotting boxes for 70 d(turned weekly) to examine the reduction of greenhouse gas emissions by adding coarse materials from matured compost(CMMC). The composted coarse materials were applied in 3 different ways:surface covering, mixture with composting materials, and surface covering plus mixture with composting materials at the first turning, with no CMMC addition as a control(CK). Results showed that surface covering with CMMC reduced NH3 emissions by 49.1%, compared with CK. The total NH3 losses were 6.1% and 22.7% lower in the mixture and covering-mixture treatments than that of CK, respectively. In the mixture and covering-mixture treatments, nitrite-oxidizing bacteria in CMMC oxidized NO-2-N to NO3--N, reducing denitrification and in turn N2O production significantly. At the end of the experiment, the total N2O losses were 35.7% and 74.1% lower in the covering-mixture and mixture treatments than in CK treatment, respectively. The covering treatment decreased CH4 emissions by 67.4, due to the oxidation in the surface layer. The CH4 emissions also reduced by 41.8% in the mixture treatment, maybe own to reduced anaerobic zones. Together, CMMC surface covering, mixture and covering-mixture treatments reduced total GHG emissions by 35.2%, 50.4% and 58.1% over the control, respectively. These findings indicate that covering-mixture with coarse material from matured compost could be applied to reduce the secondary pollution from organic waste composting. |
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