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Reaction Kinetics of Membrane Separation Anaerobic Digestion

膜分离厌氧消化的反应动力学

基本信息

批准号：
04650500
负责人：
AYA Hidenori
金额：
$ 1.28万
依托单位：
MUSASHI INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

Membrane separation anaerobic digestion is a process that consists of a complete mixing digester and membrane separation units that separates mixed liqueur to permeate and concentrate. The former one is discharged and the later is returned to the digester. The combined process is a kind of immobilized bioreactor that holds all of biomass and undigested solid. Treated permeate contains COD of less than 500 mg/L.There is not any organic solid accumulation nor inorganic solid that is liquefied and passes through membrane. Experiments were conducted by semi-batch reactors of which volume was 20L at 35ﾟC to determine reaction kinetics of real sewage sludge digestion. After feeding substrate, small amount of permeate was withdrawn through membrane at proper interval. VFA concentration of each sample was measured by gas chromatogram. Reaction velocity of VFA was estimated by using pure VFA solution as substrate. Employing those parameters obtained, a reaction model of the process was produced. Disintegration of VFA was estimated to follow first order reaction. Hydrolysis of organic solid in sewage sludge was also first order reaction on the condition that velocity of acidification was not a limiting factor. When first order reaction of biomass autolysis was introduced, change of VFA concentration in the permeate fitted well to the reaction model. Disintegrated biomass seemed to be used as substrate by the proposed model and observed stable concentration ratio of inorganic substance. To confirm this fact, digested sludge was stabilized by high temperature and was fed to the digesters. Gas production was observed, but amount of it was smaller than that of flesh sludge. The experiment indicated a new process of complete disintegration of sewage sludge.

膜分离厌氧消化是由完整的混合消化器和膜分离单元组成的过程，将混合酒分离为渗透物和浓缩物。前者排出，后者返回消化池。该组合工艺是一种固定式生物反应器，可容纳所有生物质和未消化的固体。处理后的产水COD小于500mg/L，无有机固体积累，无无机固体液化透过膜。实验在35℃、体积为20L的半间歇式反应器中进行，以确定实际污水污泥消化的反应动力学。加入底物后，以适当的时间间隔通过膜排出少量渗透物。通过气相色谱法测定各样品的VFA浓度。使用纯 VFA 溶液作为底物估算 VFA 的反应速度。利用获得的这些参数，生成了该过程的反应模型。 VFA 的分解估计遵循一级反应。在酸化速度不是限制因素的情况下，污水污泥中有机固体的水解也是一级反应。当引入生物质自溶一级反应时，渗透液中 VFA 浓度的变化很好地符合反应模型。该模型似乎使用分解的生物质作为底物，并观察到稳定的无机物质浓度比。为了证实这一事实，消化后的污泥通过高温稳定并被送入消化池。观察到气体产生，但其量少于肉泥。该实验揭示了污水污泥完全崩解的新工艺。