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.

含有高浓度的氮的牲畜废水的排放会导致富营养化，藻类血液和地下水污染。我们开发了一种在单个反应器中同时硝化和硝化剂（SND）的膜体现生物膜反应器（MABR）。1。在使用氧气微电极的几个厚度研究中，研究了几个厚度的生物膜中溶解氧（DO）的分析。从该实验中，在厚的生物膜的底部观察到一个大的厌氧区。该结果清楚地表明，在同一生物膜中产生了完全不同的微环境，从而允许SND。2。使用SND在MABR上使用MABR可行性的可行性进行了150天。 50天后，有机碳和氮的去除效率超过90％以上，这表明可以使用MABR来实现SND。3。将MABR施加到牲畜废水中，研究了牲畜废水的去除特征，研究了1年。有机碳和氮的平均去除效率分别为5.76 g-c/（m^2 ・日）和4.48 G-N/（M^2 ・天），其去除率分别为96％和83％。特异性细菌的原位检测与DO微型细菌的测定的结合使证明SND机理和生物膜中的微生物生态学是可能的。此外，不是通过硝酸盐去除氮，而是在MABR系统中实现了亚硝酸盐。 MABR可以轻松控制氧气传递，因此在从低碳/氮比废水（如牲畜）中去除氮时很有用。