Study on Anaerobic Fermentation System for Agricultural and Food Wastes Using Two-phase Fermenter and Utilization of Biogas Generation

研究了一种利用两相发酵罐对农业和食品垃圾进行厌氧发酵的系统。以甘薯烧酒的蒸馏废液为原料，进行了有机物质含量较高的试验。首先，为了研究产酸菌和产甲烷菌的厌氧发酵特性，采用小型罐式发酵罐进行了批量培养试验。测定BOD、COD、VAF浓度、MLSS、MLVSS、沼气生成率、甲烷气体浓度、细菌浓度（DNA重量）。在对数细菌繁殖期发酵速率最大，在最大细菌繁殖率下发酵效率最大。利用线性编织-体积图分析了有机物分解速率与细菌增殖速率的关系，并估计了最佳保留时间。细菌的繁殖特性应用于Monod模型，更多的是对数细菌繁殖项。龙格-库塔-吉尔法的理论分析值与实验值拟合。其次，在实际规模的两相发酵罐上对厌氧发酵、消化废物净化、沼气产率进行了研究。在发酵罐中，厌氧细菌将有机物分解成甲烷和二氧化碳气体。从COD去除率、COD与bod去除率、VFA浓度及最佳发酵条件等方面对发酵罐的性能进行了探讨。在能量收集方面，测定了产气量、产气比α (m3/kgCOD)、β （m3/m3废物）和甲烷浓度，并在不同的厌氧发酵条件下讨论了产气效率。本研究表明，两相厌氧发酵制气系统对高浓度有机废物的处理具有实际意义，所产沼气有望成为一种替代能源。少

Inthis study, An anaerobicfermentation system for agricultural and food wastes usingtwo-phase fermenter were discussed. Distilllation liquid waste of sweet potato shochu which contained high concentration of organic substance was used in this experiment.First, in order to investigate anaerobicfermentation characteristics of acid-forming and methane forming bacteria, a small scale jar-fermenter were used on a batch culture test. BOD, COD and VAF concentrations, MLSS, MLVSS, biogas generated rate, methane gas concentration, and bacterium concentration (DNA weight) were measured. A fermentation rate was maximum at logarithmic bacterium maltiplication term, and anefficiency of fermentation was maximum at maximum bacterium maltiplication rate. A relationship between organic substance decomposition rate and bacterium maltiplication rate was shown using alineweaver-Bulk plot, and an optimum retention time was estimated. Bacterium maltiplication characteristics were applied for Monod model at … More the logarithmic bacterium maltiplication term. Theoretical analysis value using Runge-Kutta-Gill method was fitted for eperimental value.Second, anaerobic fermentation witha practical scale two-phasefermenter, purification of digestive waste, productivity of biogas were investigated. In the fermenter, anaerobicbacteria decompose organic substance into methaneand carbonic dioxide gas. The performance of fermenter was discussedby usingCOD removal rate, removal ratio of COD andBOD, VFA concentration and the optimum condition of fermentation for the disposal of the waste. In energy collection, the biogas generatedrate, the producedbiogas ratio alpha(m3/kgCOD), beta(m3/m3waste) and the concentration of methane were measured, andtheefficiencyof biogas generation was discussed with the various conditions for anaerobic fermentation. The present studyclarified that the biogas generation system with two phase anaerobic fermenterwas practically useful for the disposal of concentrated organic waste and produced biogas could be expected as a substitute energy. Less