Development of a membrane-aerated biofilm reactor applicable to livestock wastewater

适用于畜禽废水的膜曝气生物膜反应器的研制

基本信息

批准号：
12555219
负责人：
TSUNEDA Satoshi
金额：
$ 8.45万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2003
项目状态：
已结题

项目摘要

The discharge of livestock wastewater that contains high concentration of nitrogen causes eutrophication, algal blooms and groundwater pollution. We developed a membrane-aerated biofilm reactor (MABR) capable of simultaneous nitrification and denitrificaiton (SND) in a single reactor.1.Analysis of dissolved oxygen (DO) profile in biofilmsDO profile in biofilms of several thicknesses was investigated using an oxygen microelectrode. From this experiment, a large anaerobic zone was observed at the bottom of the thick biofilm. This result clearly indicated the possibility that quite different microenvironment is created in a same biofilm, allowing for SND.2.Feasibility of SND using the MABRFeasibility of SND on the MABR for treatment of domestic wastewater was conducted for 150 days. After 50 day, removal efficiencies of organic carbon and nitrogen were more than 90%, which indicates that SND can be accomplished using the MABR.3.Application of the MABR to livestock wastewaterThe removal characteristics from livestock wastewater were investigated for 1 year. Average removal efficiencies of organic carbon and nitrogen were 96% and 83% at removal rates of 5.76 g-C/(m^2・day) and 4.48 g-N/(m^2・day), respectively. The combination of the in situ detection of specific bacteria and determination of the DO microprofiles made it possible to prove the mechanism of SND and the microbial ecology in the biofilm. Furthermore, nitrogen removal not via nitrate but nitrite was mainly achieved in the MABR system. The MABR takes advantage of the easy control of oxygen mass transfer, and thus it is useful when removing nitrogen from low carbon/nitrogen-ratio wastewater such as livestock.

含有高浓度氮的畜牧废水的排放会导致富营养化、藻华和地下水污染。我们开发了一种能够在单个反应器中同时硝化和反硝化（SND）的膜曝气生物膜反应器（MABR）。1.溶解分析。生物膜中的氧 (DO) 分布使用氧微电极研究了多种厚度的生物膜中的 DO 分布，从该实验中观察到了大的厌氧区。这一结果清楚地表明，在同一生物膜中可能会产生截然不同的微环境，从而允许 SND。2.使用 MABR 进行 SND 的可行性对 MABR 进行 SND 处理生活废水的可行性进行了研究。 50天后150天，有机碳和氮的去除效率超过90％，这表明使用MABR可以完成SND。3.MABR在牲畜上的应用。废水对牲畜水中的去除特性进行了为期 1 年的调查，去除率为 5.76 g-C/(m^2·day) 和 4.48 g-N/(m^2·day ) 时，有机碳和氮的平均去除效率分别为 96% 和 83%。分别将特定细菌的原位检测和 DO 微剖面的测定相结合，使得证明 SND 的机制和生物膜中的微生物生态成为可能。此外，MABR系统主要不是通过硝酸盐而是通过亚硝酸盐去除氮，MABR利用了易于控制氧传质的优点，因此在去除牲畜等低碳/氮比废水中的氮时非常有用。