内电解-SMBR组合工艺处理蒽醌活性染料废水

采用自制的PVDF中空纤维膜组件构建浸入式膜生物反应器,进行了内电解-SMBR组合工艺处理难降解蒽醌染料(活性艳蓝X-BR)废水的试验.试验分为2组,一组为内电解出水直接进入的SMBR-3,另外一组为内电解出水经调节pH值达9~10后进入的SMBR-4.结果表明,组合工艺中2组SMBR对CODCr、色度和NH4+-N的去除率均很高,且相差不大;但两反应器对TN的去除效果却有明显差异,由于良好生物铁絮体的存在,SMBR-3对TN的去除可高达92.8%,而SMBR-4对TN的去除只有67.5%.与pH值调节后进水相比,内电解直接进水导致活性污泥絮体粒径增大34μm,EPS总量明显增加,且微生物表面结构中有丝状菌出现,菌种也变得相对复杂.对SMBR膜材料进一步检测发现,内电解直接进水所形成的生物铁絮体还可有效减轻膜污染,使膜通量衰减变慢.

Combined internal electrolysis/SMBR process for treatment of reactive anthraquinone dye wastewater

Wastewater containing reactive brilliant blue X-BR anthraquinone dye was treated by internal electrolysis coupled with submerged membrane bioreactor (SMBR), in which the self-made PVDF hollow fiber membrane modules were applied. During the experiments performance of SMBR-3 with internal electrolysis water directly entering was compared with SMBR-4 in which water entered after regulating pH to 9~10. The rates of both two SMBR on CODCr and NH4+-N removal were high, but the efficiency on TN removal was very different, in which SMBR-3 had a high rate of 92.9% compared to just 67.5% for SMBR-4. The mean particle diameter of activated sludge in SMBR-3 was 34μm bigger than SMBR-4, and the change of EPS quantity was in the same trend. Some extra filamentous bacteria in microorganism surface texture were observed in solution which predicted the relative intricacy of cultures. The bio-ferric sludge forming in SMBR-3 was found to be useful to alleviate membrane fouling and made the flux decline become slower.