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| Effects of sawdust covering thickness on greenhouse effect during biogas slurry storage |
| Received:December 12, 2023 |
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| KeyWord:sawdust;biogas slurry;covering thicknesses;greenhouse effect;microbial community structure |
| Author Name | Affiliation | E-mail | | WEI Jiaxin | College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Beijing 100193, China
Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | LUO Yiming | Beijing General Station of Animal Husbandry, Beijing 100101, China | | | GUO Wei | Lanzhou Xinrong Environmental Energy Engineering Technology Co., Lanzhou 730099, China | | | LIU Wancen | College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Beijing 100193, China
Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | LUO Wenhai | College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Beijing 100193, China
Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | LI Guoxue | College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Beijing 100193, China
Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | ZHANG Zhiye | College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Beijing 100193, China
Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | QI Chuanren | College of Resource and Environmental Sciences, China Agricultural University, Beijing 100193, China
Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Beijing 100193, China
Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | Qichuanren95@163.com |
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| Abstract: |
| To effectively control the greenhouse effect in the storage process of biogas slurry, we used sawdust as the covering material and explored the effects of different covering thicknesses（2, 4 cm, and 6 cm）on emissions of ammonia（NH3）and greenhouse gases[nitrous oxide（N2O）and methane（CH4）] and microbial community structure in the storage process of biogas slurry produced by fermentation of black membrane biogas digester in dairy farms. Using the comprehensive greenhouse effect as an evaluation index, appropriate covering thickness was determined. The results demonstrated that the NH3 emission reduction rates of 2, 4 cm, and 6 cm sawdust covering treatments were 37.5%, 19.4%, and 24.2%, respectively. The emission reduction rates of N2O were - 84.7%, 41.9%, and 44.6%, respectively. The emission reduction rates of CH4 were -18.7%, 16.3%, and 23.7%, respectively. From the microbial community structure perspective, all mulch treatments reduced the abundance of microorganisms related to carbon and nitrogen cycles and weakened the organic matter decomposition and the greenhouse gas production in biogas slurry. However, with the increase of the covering thickness, the sedimentation and decomposition of sawdust materials were enhanced, and the weakening effects of carbon and nitrogen cycling were gradually reduced. However, the adsorption and hindering effects of gas escaping were still enhanced with the increase of covering thickness, and the total CO2 equivalent produced by biogas slurry was gradually reduced. Taking into account all the greenhouse gas emissions, The total CO2 equivalences produced by a unit volume of biogas slurry in 35 d were 10.2, 13.0, 7.9 g CO2e·L-1, and 7.3 g CO2e· L-1, respectively, in the untreated treatment, 2, 4 cm, and 6 cm sawdust covering treatment. Therefore, it is more economical and effective to use sawdust with a 4 cm covering thickness to cover biogas slurry. |
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