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| Changes in carbon and nitrogen in biogas slurry during mixed anaerobic fermentation and storage of animal manure and straw |
| Received:December 27, 2017 |
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| KeyWord:anaerobic fermentation;biogas slurry storage;total organic carbon;total nitrogen |
| Author Name | Affiliation | E-mail | | LIU Ye | School of Biology and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan 430023, China
Institute of Rural Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Beijing 100121, China
Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beijing 100121, China | | | MENG Hai-bo | Institute of Rural Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Beijing 100121, China
Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beijing 100121, China | | | WANG Jian | Institute of Rural Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Beijing 100121, China
Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beijing 100121, China | | | SHEN Yu-jun | Institute of Rural Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Beijing 100121, China
Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beijing 100121, China | | | DING Jing-tao | Institute of Rural Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Beijing 100121, China
Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beijing 100121, China | | | LI Rui | School of Biology and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan 430023, China | liruiwuhan@163.com |
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| Abstract: |
| In order to investigate changes in carbon and nitrogen in biogas slurry during anaerobic fermentation and storage, in the present study, pig manure, chicken manure, and straw were mixed to perform mesophilic anaerobic fermentation for 30 days. Afterwards, the biogas slurry was stored at room temperature for 30 days under 4 treatment conditions:closed and settled (CS), closed and agitated (CA), opened and settled (OS), and opened and agitated (OA). The forms and concentrations of carbon and nitrogen were tracked and analyzed in biogas slurry over the entire duration of the fermentation. Results showed that during anaerobic fermentation, total dissolved organic carbon and organic nitrogen in biogas slurry increased significantly, while other forms of carbon and nitrogen increased slightly, which resulted in a 15.0%~36.1% increase in total organic carbon (TOC) and total nitrogen (TN). TOC concentration reached its peak (6467 mg·L-1) on day 18 of fermentation, and TN concentration reached its peak (4181 mg·L-1) on day 23. After 30 days of storage of biogas slurry, TOC and TN concentrations both decreased. TOC concentrations first decreased and then increased slowly during storage, with an overall decrease of between 2.9% and 12.0%. The order of decrease of TOC concentrations from the lowest to the highest degree was:OS < OA < CS < CA. TN concentrations first increased and then decreased during storage, with an overall decrease of between 4.2% and 56.2%. The order of decrease of TN concentrations was:CS < CA < OS < OA. Therefore, during the period between days 18 and 23 of anaerobic fermentation, TOC and TN concentrations reached peak levels in biogas slurry. The use of the closed and settled treatment and shorter storage time could effectively reduce nitrogen loss in biogas slurry during its storage. |
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