| Kinetics of biogas production and heating strategy in anaerobic fermentation of cattle manure |
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| DOI：10.7606/j.issn81000-7601.2020.03.24 |
| Key Words: cattle manure anaerobic fermentation biogas engineering biogas production rate kinetic model heating strategy |
| Author Name | Affiliation | | JIANG Tao | Chongqing Academy of Agricultural Sciences, Chongqing, 401329, China | | DENG Liangwei | Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu, Sichuan 610041, China | | WEI Xiuli | Chongqing Academy of Agricultural Sciences, Chongqing, 401329, China
Southern Scientific Observing and Experimental Station for Development and Utilization of Rural Renewable Energy, Ministry of Agriculture, Chongqing, 401329, China | | HE Jing | Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu, Sichuan 610041, China | | WANG Bing | Chongqing Academy of Agricultural Sciences, Chongqing, 401329, China | | XIANG Yuanyong | Southern Scientific Observing and Experimental Station for Development and Utilization of Rural Renewable Energy, Ministry of Agriculture, Chongqing, 401329, China |
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| Abstract: |
| This study carried out the biogas yields under different temperatures (15℃~35℃) and volumetric loads (0.5~6.0 g·L-1·d-1) on the basis of cattle manure and developed a semi\|continuous biogas anaerobic fermentation kinetics model, which was shown to be fit for the volumetric gas production rate of cow manure. The maximum volumetric rates of biogas production (（Rpmax) for fermentation at 15℃, 20℃, 25℃, 30℃, and 35℃ were found to be 20.18, 54.45, 73.86, 143.90 mL·L-1·d-1 and 146.35 mL·L-1·d-1, respectively. The θ values (temperature\|activity coefficient) within different temperature intervals with the （Rpmax-θ formula were worked out to be 1.22 at 15℃~20℃, 1.06 at 20℃~25℃, 1.14 at 25℃~30℃, and 1.00 at 30℃~35℃. In contrast to other temperature intervals, anaerobic fermentation appeared to be more sensitive to temperature variation in 15℃~20℃. According to the calculation of energy input and output, the biogas project of cattle manure in low total solid concentration (at about 1%) was not suitable for additional warming in winter in the south of China, in which the heat loss and the heat required for warming the feedstock to the expected temperature were much greater than the increased energy output. |
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