分体式膜-好氧颗粒污泥反应器的运行及膜污染特性

Characteristics of Operational Performance and Membrane Fouling in a Sidestream Membrane Sequencing Batch Reactor with Aerobic Granule

采用分体式MSBR和人工合成配水,对处理系统在进料高负荷变化条件下的运行特性和膜污染表现特征进行了研究.结果表明,MSBR系统连续运行150 d以上,在进水COD 2001 200 mg·L^-1时,COD、TP、TN和NH4^＋-N的平均去除率分别为90%、80%、60%-80%和95%.MSBR中可实现污泥完全颗粒化,在70 d时350μm左右的颗粒占90%以上,之后污泥继续长大且平均粒径达394μm.MSBR形成颗粒后,膜系统的清洗周期达65 d,是絮体污泥清洗周期的3倍以上,也大大高于一般活性污泥膜反应器的清洗周期,说明好氧颗粒污泥形成有助于提高MSBR的抗冲击负荷能力及减缓膜污染发生并维持较长时间的稳定运行.

The characteristics of operational performance and membrane fouling were investigated using synthetic wastewater as feed in a sidestream membrane sequencing batch reactor（MSBR） system.The experimental results showed that the average removal efficiencies of COD,TN,TP and NH4^＋-N were 90%,60%-80%,80% and 95% respectively under the influent COD of 200 mg·L^-1 to 1200 mg·L^-1 during more than 150 days＇ operation.It was possible to achieve a complete granulation of sludge.In 70th day,sludge particles around 350μm were detected more than 90%.From then,sludge grew up continuously and finally reached to 394μm in diameter.With the formation of granular sludge in MSBR,the cleaning time of membrane system was prolonged to 65 days,which was larger than three times compared with flocculent sludge MSBR.It was also much better than conventional MBR.These results clearly demonstrated that the formation of granular sludge was good for improving the resistance to organic loading shock and retaining the membrane fouling of the system,and maintaining the stable operation for a long time.