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| The effect of microbial agent and phosphorus-containing additives on compost maturity and pollutant gas emissions during sewage sludge composting |
| Received:August 02, 2021 |
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| KeyWord:sewage sludge;composting;microbial agent;phosphorus-containing additives;maturity;pollutant gas |
| Author Name | Affiliation | E-mail | | LI Wangwang | Hubei Xiaohuan Environmental Technology Co., Ltd., Xiaogan 432100, China | | | LIU Yan | Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | | | LI Guoxue | Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | | | YANG Jia | Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | | | YANG Yan | Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | | | MA Ruonan | Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | | | YUAN Jing | Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | jingyuan@cau.edu.cn |
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| Abstract: |
| The effects of VT microbial agents and phosphorus-containing additives（superphosphate and phosphogypsum）on compost maturity and gas emission during dewatered sludge and corn stalk composting was investigated in a laboratory-scale system. The results showed that microbial agent addition had a higher final germination index（GI），（126%~158%）, which significantly promoting compost maturity. The microbial agent combined with superphosphate reduced NH3 and H2S emissions by 63.3% and 42.8%, respectively. The combined addition of a microbial agent and phosphogypsum reduced NH3 and H2S emissions by 97.6% and 54.4%, respectively. All additive treatments reduced CH4 emissions and microbial agent addition reduced N2O emissions by 30.7%. However, combined addition of the microbial agent with superphosphate or phosphogypsum increased N2O emissions in the early stage of composting. Two treatments involving phosphorus additives increased the total nutrient content（TN+P2O5+K2O）from 18.3% to 22.9%. Therefore, combined addition of the VT microbial agent and phosphorus-containing additives is an effective method for improving the compost maturity and reducing pollutant gas emissions. |
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