BPAC-UF组合工艺对微污染原水处理效果及膜污染控制

Effect of Combined Processes of BPAC-UF on Micro-Polluted Raw Water Treatment and Control of Membrane Fouling

采用生物粉末活性炭-超滤(BPAC-UF)分体式工艺的中试装置,探究该工艺对西氿微污染原水的处理效果,在此基础上对比研究聚偏氟乙烯(PVDF)和聚氯乙烯(PVC)两种材质超滤膜的膜污染情况。PVDF膜和PVC膜两种不同材质的膜组合工艺对浊度去除率均超过95%,超滤膜可保证出水浊度要求。PVDF膜对尺寸不超过2μm的颗粒物去除效果要略优于PVC膜。初期PAC未转化为BPAC时,工艺对氨氮和CODMn的去除主要靠活性炭吸附。当PAC转化为BPAC,BPAC-UF对氨氮的去除主要是通过生物作用,后期去除率稳定在80%以上,BPAC-UF对CODMn去除率不高,稳定在25%左右。在膜污染控制方面,PVDF膜和PVC膜的跨膜压差增长趋势相似,但PVC膜的跨膜压差增速要略高于PVDF膜。经过强化物理反冲洗和化学反冲洗后,PVDF膜和PVC膜的产水性能均能恢复至较优状态,且PVDF膜恢复程度略优于PVC膜。

Pilot-scale BPAC-UF reactors were established and research on the UF membrane fouling,and the UF membrane fouling of to evaluate the treatment effect of micro-polluted raw water of Xijiu Polyvinylidene fluoride(PVDF)and polyvinyl chloride(PVC)were compared during the study.Both PVDF membrane and PVC membrane had more than 95%turbidity removal rate and met the demand of effluent turbidity.PVDF membrane had a slightly better effect on the removal of particulate matter not exceeding 2μm in size than the PVC membrane.When PAC was not converted to BPAC,the removal of ammonia nitrogen and CODMn by the process mainly depended on the adsorption.of activated carbon.When PAC was converted to BPAC,the removal of ammonia nitrogen by BPAC-UF was mainly through biological activities,and BPAC-UF was stable with a removal rete above 80%,while BPAC-UF had a low removal rate of CODMn and was stable at around 25%.In the control of membrane fouling,there were similar growth trends of TMP between PVDF membrane and PVC membrane,the growth rate of TMP of PVC membrane was slightly higher than that of PVDF membrane.Both of the two membrane could be restored well in the performance of water production after enhanced physical backwashing and chemical backwashing,and the PVDF membrane was restored better than PVC membrane.