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| Mesophilic Anaerobic Digestion of Sheep Manure and Wheat Straw Mixture with Different Mixing Ratios |
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| KeyWord:sheep manure; wheat straw; anaerobic digestion |
| Author Name | Affiliation | | XING Jie | College of Forestry, Northwest Agriculture and Forestry University, Yangling 712100, China
Research Center of Recycle Agricultural Engineering and Technology of Shannxi Province, Yangling 712100, China | | YIN Dong-xue | College of Forestry, Northwest Agriculture and Forestry University, Yangling 712100, China
Research Center of Recycle Agricultural Engineering and Technology of Shannxi Province, Yangling 712100, China | | ZHAI Ning-ning | College of Agronomy, Northwest Agriculture and Forestry University, Yangling 712100, China
Research Center of Recycle Agricultural Engineering and Technology of Shannxi Province, Yangling 712100, China | | WANG Xiao-jiao | College of Agronomy, Northwest Agriculture and Forestry University, Yangling 712100, China
Research Center of Recycle Agricultural Engineering and Technology of Shannxi Province, Yangling 712100, China | | YANG Gai-he | College of Agronomy, Northwest Agriculture and Forestry University, Yangling 712100, China
Research Center of Recycle Agricultural Engineering and Technology of Shannxi Province, Yangling 712100, China | | FENG Yong-zhong | College of Agronomy, Northwest Agriculture and Forestry University, Yangling 712100, China
Research Center of Recycle Agricultural Engineering and Technology of Shannxi Province, Yangling 712100, China | | REN Guang-xin | College of Agronomy, Northwest Agriculture and Forestry University, Yangling 712100, China
Research Center of Recycle Agricultural Engineering and Technology of Shannxi Province, Yangling 712100, China |
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| Abstract: |
| Anaerobic digestion is an efficient way to dispose and recycle agricultural organic wastes. This paper investigated the performance of anaerobic digestion of sheep manure and wheat straw mixture with different mixing ratios. Experiments were conducted in self-manufactured anaerobic digestion reactor at 35 ℃ with sheep manure/wheat straw ratios of 1∶9, 3∶7, 5∶5, 7∶3 and 9∶1 and total solid concentrations of 8% in the reactor. The pH value, contents of volatile fatty acid（VFA） and total alkalinity were examined every 6 days during anaerobic digestion. The highest cumulative biogas yield of 9580 mL was obtained in sheep manure and wheat straw mixture at the ratio of 7∶3 , while the lowest biogas production of 2886 mL was observed at the ratio of 1∶9, accounting for only 30.1% of the highest. Significant regression models for VFA and cumulative biogas yields under all ratios suggested a remarkable role of VFA in biogas production. Daily biogas yield was dynamically correlated with the pH value, VFA and total alkalinity. This study may provide a new way to effectively utilize livestock manure and crop residues. |
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