我国规模化沼气工程存在原料单一、产气率低、装备落后等技术瓶颈,西南地区沼气原料来源分散、成分复杂,因此需要开发新的多种原料混合发酵的新模式来提高沼气工程厌氧消化效率。本工程通过全混式厌氧发酵两级工艺共同厌氧消化如秸秆和畜禽粪便等分散原料,形成新的沼气和发酵剩余物利用模式。结果表明,在30 d稳定运行期间,600 m3厌氧发酵罐每天可消纳猪粪7.9 t、浓污水8.2 t及农作物秸秆0.2 t,日产气量为900 m3,混合原料发酵的容积产气率达1.5 m3/(m3∙d)。
Large-scale biogas projects are impeded by single feedstock, relatively low gas production rate, backward equipment, and other technical bottlenecks in China. Due to the decentralized sources as well the complex components of feedstock in the southwestern region, a new mixed fermentation model of multiple raw materials needs to develop to improve biogas project anaerobic digestion efficiency. Herein a new pattern for utilizing biogas and fermentation residues based on co-digestion of urban decentralized feedstock by the continuous stirred tank reactor process was presented, to digest materials such as straw and raw manure. Results showed that 900 m3 biogas could be produced from 7.9 tons of pig manure, 8.2 tons of thick sewage, and 0.2 tons of crop stalks per day in the 600 m3 fermentation tank during 30 days stabilized operation, and the tank volume gas production rate was up to 1.5 m3/(m3∙d).
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