海绵填料对AAO—MBR处理效能及膜污染的影响

Effect of Sponge Filler on AAO-MBR Treatment Efficiency and Membrane Fouling

在相同的运行条件下,分别采用AAO—MBR与AAO—HMBR(投加海绵填料的复合式膜生物反应器)处理生活污水,考察投加海绵填料对AAO—MBR处理效能及膜污染的影响。结果表明,两种反应器对生活污水中的COD、氨氮、TN均有较好的去除效果,出水中除TP之外的其他指标浓度均能满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准。投加填料后,反应器对COD、氨氮、TN和TP的去除率分别由92.71%、95.08%、41.87%、64.13%提高至96.06%、98.34%、59.10%、72.20%;另外,膜污染状况也有所改善,当跨膜压差(TMP)达到26kPa时,HMBR运行了20 d,而MBR仅运行了13 d;在60 d的运行过程中,MBR中的膜组件进行了4次清洗,而HMBR中的膜组件仅清洗了2次。运行相同时间后,MBR的膜表面有清晰可见的污染物附着,而HMBR的膜表面仅有少量污染物附着;红外光谱分析表明,膜表面滤饼层污染物主要为蛋白质与多糖。

Domestic sewage was treated by AAO-MBR and AAO-HMBR(hybrid membrane bioreactor with sponge filler) under the same operational conditions, and effects of adding sponge filler on treatment efficiency and membrane fouling of AAO-MBR were investigated. Both of the reactors had good removal effect on COD, ammonia nitrogen and TN in domestic sewage, and all other indexes except TP in the effluent could meet the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002). After adding sponge filler, the removal efficiencies of COD, ammonia nitrogen, TN and TP were increased from 92.71%, 95.08%, 41.87% and 64.13% to 96.06%, 98.34%, 59.10% and 72.20%, respectively. In addition, membrane fouling was improved. When the transmembrane pressure(TMP) reached 26 kPa, HMBR operated for 20 days, while MBR operated for only 13 days. During 60 days of operation, membrane module in MBR was cleaned four times, while the membrane module in HMBR was cleaned only twice. After running for the same time, the membrane surface of MBR had clear visible contaminants, while the membrane surface of HMBR had only a small amount of contaminants. Infrared spectrum analysis showed that the filter cake layer on the membrane surface was mainly proteins and polysaccharides.