AAOA-MBR工艺在超高污泥浓度下的运行

Operation Analysis of AAOA-MBR Process in Ultra-high Sludge Concentration

为了解超高污泥浓度(MLSS)对膜生物反应器(MBR)工艺运行效果的影响,分析了某采用厌氧/缺氧/好氧/缺氧(AAOA)-MBR工艺的城市污水处理厂在超高MLSS浓度下的运行情况。结果表明:MBR工艺可在较高的污泥浓度下运行,并且高污泥浓度有助于系统对有机物的去除。该污水厂的MBR膜池在20 g/L左右的超高污泥浓度下运行了超过600 d的时间,出水COD、氨氮、TN、TP浓度分别约为14、0.43、6.37和0.25 mg/L;高污泥浓度可增强系统抵御低温、进水负荷冲击的能力,并且联合后置缺氧段强化了系统的内源反硝化。MBR系统在高污泥浓度下运行,需要密切注意膜通量及跨膜压差的变化,适时进行膜清洗,以免发生膜污染。

The actual operation data of a wastewater treatment plant with anaerobic/anoxic/aero bic/post-anoxic （AAOA） - MBR process was analyzed in order to know the effect of ultra-high MLSS on the operation of AAOA - MBR process. The results showed that MBR process could operate at high MLSS concentration, which was beneficial to the removal of organic matter. The MBR system was running in MLSS concentration of about 20 g/L for more than 600 days, during the time the mean COD, NH3 - N, TN, TP concentrations of effluent were about 14, 0.43, 6.37 and 0.25 mg/L respectively. The high MLSS could increase the anti-impact ability of the system to low temperature and influet load, and strengthen the system＇ s endogenous denitrification combined with the post-anoxic phase. However, while running in a very high MLSS, the MBR system should be paid close attention to the membrane flux and transmembrane pressure （TMP） variation, and need timely washing, in order to avoid membrane fouling. tank