餐厨垃圾与污泥、秸秆不同配比联合厌氧发酵对产气性能的影响

Biogas Production of Anaerobic Co-Digestion with Different Ratios of Kitchen Waste,Sewage Sludge and Rice Straw

为分析不同配比的餐厨垃圾与污泥、秸秆联合发酵对产气性能的影响,采用产甲烷潜力试验(BMP)研究了餐厨垃圾与污泥、秸秆不同配比联合发酵的产气性能,并采用修正的Gompertz模型对产甲烷潜力进行模拟.结果表明:物料配比与物料种类对联合发酵的产气性能有显著影响,餐厨垃圾+污泥配比为1∶2时,产气性能优于1∶1、2∶1两组,产气量为286 mL/g〔以VS(挥发性固体)计,下同〕;餐厨垃圾+秸秆配比为1∶1时,产气性能优于1∶2、2∶1两组,产气量为347 mL/g;餐厨垃圾+污泥+秸秆配比为1∶1∶1时,产气性能优于1∶2∶1、2∶1∶1两组,产气量为373 mL/g.两种物料配比中,餐厨垃圾+秸秆的产气性能优于餐厨垃圾+污泥;餐厨垃圾+污泥+秸秆3种物料混合后物料种类变丰富,元素配比更均衡,联合发酵的产气性能优于两种物料联合发酵,其最优配比为1∶1∶1,C/N值为13,接近最优C/N值(15~20).研究显示,不同配比物料产气性能差异性较大,可为大中型沼气工程在获得不同物料的情况下选择最优的进料配比提供理论指导,以解决其在设计与投资收益评估方面所面临的物料选择问题.

The effects of different ratios of kitchen waste,sewage sludge and rice straw fermentation on gas production performance were studied.The biogas production of the combined fermentation of kitchen waste,sewage sludge and rice straw with different ratio was studied by methane potential experiment(BMP).The modified Gompertz model was used to simulate the methanogenic potential.The results showed that material ratio and material type had a significant impact on biogas production of the combined fermentation.When the mixing ratio of kitchen waste+sewage sludge,kitchen waste+rice straw,kitchen waste+sewage sludge was 1∶2,1∶1 and 1∶1∶1,the biogas production performance was the best,and the biogas production was 286,347,373 m L/g,respectively.The biogas production performance of kitchen waste+rice straw was better than that of kitchen waste and sewage sludge.Compared with the two materials combined fermentation,the mixture of three kinds of materials,such as kitchen waste+rice straw+sewage sludge,were richer in materials,the ratio of elements was more balanced,and the biogas production performance was better.When the optimal ratio was 1∶1∶1,the C/N ratio was 13,which is close to the optimal C/N(15-20).This study provides a theoretical reference for large and medium-sized biogas projects to choose the best feed ratio for different materials.The research shows that the difference of gas production performance of different mixing ratio materials can provide theoretical guidance for large and medium-sized biogas projects to choose the optimal feeding ratio in the case of obtaining different materials to solve their problems in design and investment income evaluation,and in material selection.