MBR中低pH值与低有机负荷引起的污泥膨胀及其恢复  

Sludge Bulking and Its Recovery Caused by Low pH Value and Low Organic Loading in MBR

作　　者：李亚峰[1] 金亚斌[1] 陈涛[1] 孟繁丽[1] 高可[1] 

机构地区：[1]沈阳建筑大学市政与环境工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2007年第6期994-998,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：建设部攻关项目(05-K2-9);沈阳建筑大学省级重点实验室开放基金资助项目(HJ-200605)

摘　　要：目的研究低pH值、低有机负荷引起的丝状菌活性污泥膨胀对MBR工艺运行效果的影响，控制污泥膨胀，为实际工程应用提供实验依据.方法试验以增加反应器内的碱度和污泥负荷来提供适应菌胶团生长的微生物环境为主，同时投加次氯酸钠杀菌剂和硫酸亚铁絮凝剂来辅助控制污泥膨胀.结果污泥膨胀期间，上清液CODcr平均去除率比未发生污泥膨胀时提高了6.31%；为保持恒定出水量，膜两侧压差在7 d内由10 kPa迅速增加到65 kPa.控制反应器内pH值7.2-8.0，BOD污泥负荷在0.292-0.323，调整十余天后，成功控制住了污泥膨胀.结论丝状菌比表面积大，在低底物浓度的条件下对基质的亲和能力比菌胶团强，污泥膨胀使膜污染急剧增加.创造有利于菌胶团生长的微生物环境可有效地恢复由丝状菌引起污泥膨胀.Experiment was made to investigate the influence of sludge bulking of filamentous microbe caused by low pH value and low organic loading on the operation of MBR. We controlled sludge bulking and offered experimental data to the practical project. Mainly increasing alkalinity and sludge loading in the reactor for microbial condition where zoogloea grew easily, we added Javel water and ferrous sulfate on side, and sludge bulking was well under control. The result shows that there was an increase of the removal rate of COD in the process of sludge bulking, which rose by 6.31% compared with no sludge bulking happening in the upper liquid. In order to maintain the out water volume, the higher net water-head differential pressures changed from 10 MPa to 65 MPa within 7d. With pH value ranging from 7.2 to 8.0 in reactor, sludge loading changed between 0. 292 and 0. 323 kgBOD/（kgMLSS·d）. After more than ten days, sludge bulking was successfully kept under control. Sludge bulking got membrane polluted in an increasing rate. Therefore, it created a favorable environment for the growth of zoogloea and made the recovery of sludge bulking of filamentous microbe easily.

关 键 词：膜生物反应器 膜污染 污泥膨胀 污泥负荷 

分 类 号：X703[环境科学与工程—环境工程]