Biogas production characteristics of anaerobic fermentation by mixing chicken manure with crop straw
CHEN Guang-yin1,2, ZHENG Jia-wei2, CAO Hai-nan2, WANG En-hui2, WU Pei2
1. Anhui Engineering Laboratory of Soil and Water Pollution Control and Remediation, Wuhu 241002, China; 2. School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
Abstract：In order to evaluate effects of anaerobic fermentation on biogas production of crop straw, four different levels of wheat straw and their mixtures with chicken manure were generated to make anaerobic fermentation; then, the gas production, pH value, EC, TVFAs, NH4+-N, and alkalinity contents of the digestive juice were analyzed during the experiment. The results showed that the biogas yields of wheat straw fermented alone were low, and the indicators of digestive juice in the mono-fermentation of different forms of wheat straw tended to be highly similar. In general, the values of indicators of the raw wheat straw were higher than those of the fermented wheat straw. The indicators' values of the extruded wheat straw were higher than those of the unextruded wheat straw. In addition, the biogas yield, the pH value, EC, and the TVFAs, NH4+-N, and alkalinity contents of chicken manure were much higher than those of all wheat straw fermented treatments alone. The biogas production rate and gas peak of wheat straw were improved by fermenting with chicken manure, while the peak occurrence time and the time to reach 80% of the total biogas production were also shorten. However, not all forms of wheat straw were available to the fermentation with chicken manure to improve the biogas production of wheat straw. After deducting the biogas production of chicken manure, the TS biogas yields of the fermentation treatments of chicken manure with raw wheat straw, extruded wheat straw, fermented wheat straw, and extruded fermented wheat straw increased by -12.19%, 10.54%, 13.01%, and -12.21%, respectively, compared with the corresponding wheat straw fermented alone. There were no significant differences in indicators' values between treatments (P>0.05). The values of those indicators in fermentation treatments were in between those of the treatments of chicken manure and wheat straw fermented alone. The changes in biogas production and each index were more moderate, and the anaerobic fermentation process was more stable. Therefore, a higher gas yield can be obtained by mixing chicken manure with extruded straw or primarily fermented wheat straw.
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