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

本研究探讨了一种利用两相发酵罐厌氧发酵处理农业废弃物和食品废弃物的系统。以含有高浓度有机物的甘薯烧酒废液为研究对象，首先利用小型罐式发酵罐进行了产酸菌和产甲烷菌厌氧发酵特性的研究。测定了BOD、COD和VAF浓度、MLSS、MLVSS、沼气产生率、甲烷气体浓度和细菌浓度(DNA重量)。A发酵速率在对数增菌期最大，发酵效率在最大增菌率时最大。利用线织-体积图分析了有机物分解率与细菌增殖率之间的关系，并估算了最佳停留时间。细菌增殖特性在…的Monod模型中得到应用对数细菌繁殖期越长。对Runge-Kutta-Gill法的理论解析值与实验值进行了拟合。其次，对实际规模的两相发酵罐厌氧发酵、消化垃圾的净化、沼气产量进行了研究。在发酵罐中，厌氧细菌将有机物分解为甲烷和二氧化碳气体。从COD的去除率、COD和BOD的去除率、VFA浓度以及处理废水的最佳发酵条件等方面对发酵罐的性能进行了讨论。在能量收集方面，测定了沼气产生率、产气率α(m~3/kgCOD)、β(m~3/m~3垃圾)和甲烷浓度，并讨论了不同厌氧发酵条件下沼气的产气效率。研究表明，两相厌氧发酵沼气系统在处理浓缩有机废物方面具有实用价值，沼气可作为一种替代能源。较少

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