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Control of Fouling Substances in Membrane Bioreactors with Intermittent Aeration

间歇曝气膜生物反应器中污垢物质的控制

基本信息

批准号：
11650565
负责人：
NAGAOKA Hiroshi
金额：
$ 1.98万
依托单位：
Musashi Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

The performance of the submerged membrane separation activated sludge process with intermittent aeration was investigated in a laboratory scale experiment changing organic loading rate and intermittent aeration cycle. A rectangular PVC tank was used as an aeration tank, in which a flat-sheet type Micro-Filtration membrane made of poly-olefin with the pore size of 0.2μm was submerged. Organic loading rate to the reactor was set at 0.3 and 0.8 g-TOC/L/day. C/N ration in the feed was set at around 5.0 for every condition. Aeration cycle was changed from 10min-10min (aeration - stop) to 120min-120min in different organic loading conditions. Flux through the membrane was set at 0.25m/day. Membrane fouling proceeded rapidly in 0.8 g-TOC/L/day conditions. However, when organic loading rate was 0.3 g-TOC/L/day, bacterial metabolic substances were degraded rapidly compared to the production thereby decreasing viscosity in mixed liquor. Nitrogen removal rate was between 60% and 80% for 0.8 g-TOC/L/day loading, and between 50% and 65% for 0.3 g-TOC/L/day loading. And the nitrogen removal was highest in 40min to 60min aeration cycle conditions. Too short aeration cycle did not result in sufficiently long anoxic periods for denitrification while too long cycle resulted in unnecessary anaerobic periods after depletion of nitrate. Intermittent aeration was effective also for decreasing viscosity in mixed liquor.

通过实验室规模试验，研究了间歇曝气下膜分离活性污泥工艺的性能，改变了有机负荷率和间歇曝气周期。采用矩形PVC池作为曝气池，其中浸没了孔径为0.2μm的聚烯烃平板型微滤膜。反应器的有机负载率分别为0.3和0.8 g-TOC/L/d。每种条件下饲料C/N比例均设定在5.0左右。在不同的有机负荷条件下，曝气周期由10min-10min（曝气停止）改变为120min-120min。通过膜的通量设定为0.25m/天。在0.8 g-TOC/L/天的条件下，膜污染迅速进行。然而，当有机负荷速率为0.3 g-TOC/L/d时，细菌代谢物质的降解速度比产量快，从而降低了混合液的粘度。当负荷为0.8 g-TOC/L/d时，氮去除率为60% ~ 80%；当负荷为0.3 g-TOC/L/d时，氮去除率为50% ~ 65%。在曝气周期为40min ~ 60min的条件下，氮去除率最高。太短的曝气周期不会导致足够长的缺氧时间进行反硝化，而太长的曝气周期会导致硝酸盐耗尽后不必要的厌氧时间。间歇曝气也能有效降低混合液的粘度。