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A Developmental Research on Upgrading and Practical Application of Anaerobic Contact Process by Using Two-Phase Anaerobic Process

两相厌氧工艺厌氧接触工艺升级改造及实际应用的进展研究

基本信息

批准号：
01850127
负责人：
NOIKE Tatsuya
金额：
$ 4.74万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B).
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

A biological sludge bulking phenomenon was observed in experimental anaerobic contact processes (ACP) treating wheat starch waste water, and the bulking was caused by filamentously growing anaerobic microorganisms. There are many kinds of anaerobic microorganisms which grow filamentously, like in activated sludge. One species of anaerobic bacteria caused serious sludge bulking, and it had thin rod (around 0.2 m in width) and long chained morphology. When acidogenically fermented starch waste water was fed to the ACP, the thin rod microorganism was eliminated and the biomass concentration of the methanogenic fermentor was recovered. From these results, it is revealed that acidogenic fermentation of waste water containing raw starch prior to treatment by an ACP is effective to prevent the anaerobic sludge bulking and to keep high organic loading of ACPs.The comparison of one-phase and Two-phase anaerobic digestion processes in the characteristics of substrate degradation and the bacterial population levels was investigated by using the chmostate-type reactor to which starch was fed as substrate when both processes were operated under the same experimental conditions. It was found that the two-phase system was more stable to the change in pH than one-phase system. The methane recovery rates and COD removal rates in the two-phase system increased by 4 to 9% and 3 to 10%, respectively. The population levels of acidogenic bacteria in both system were in the same order, but the number of acetate-utilizing methanogenesis in the methanogenesis of the two-phase system were 2 to 10 times higher than in the one-phase system. The phase separation by high dilution rate would strengthen the ecological relationships among the bacteria rather than weaken or destroy these relationships.

在厌氧接触法(ACP)处理小麦淀粉废水的实验过程中，观察到了生物污泥膨胀现象，这种膨胀是由丝状生长的厌氧微生物引起的。有许多种类的厌氧微生物以丝状生长，就像在活性污泥中一样。其中一种厌氧细菌引起严重的污泥膨胀，其杆状细长(约0.2m宽)，形态呈长链状。当产酸发酵淀粉废水进入ACP时，消除了细杆微生物，恢复了产甲烷发酵罐的生物量。结果表明，含生淀粉废水在ACP处理前进行产酸发酵，可以有效地防止厌氧污泥膨胀，保持较高的ACP有机负荷。在相同的实验条件下，采用以淀粉为基质的摇瓶式反应器，对单相和两相厌氧消化工艺的底物降解特性和细菌数量进行了比较。结果表明，两相体系比单相体系对pH的变化更稳定。两相系统中甲烷回收率提高4~9%，COD去除效率提高3~10%。两相系统产酸菌种群数量顺序相同，但两相系统产乙酸菌数量是单相系统的2~10倍。高稀释率的相分离会加强细菌之间的生态关系，而不是削弱或破坏这些关系。