Purification of micro-polluted reservoir water from Huanghe river by membrane bioreactors

To investigate the feasibility of hybrid membrane process for treating micro-polluted water,the treatment of micro-polluted reservoir water from Huanghe river,which presented low turbidity and low temper-ature were carried out,and the submerged membrane bioreactors without(MBR)and with(PAC-MBR)pow-dered activated carbon(PAC)were evaluated for drinking water production,while the fouling mechanism of the two membrane were discussed too.Both of the MBR and PAC-MBR guaranteed the turbidity removal a-bove 97%.The ability of organic substances removal were:PAC-MBRMBRconventional processultra-filtration(UF)alone.No effect of UF alone on NH 3-N removal was observed,while PAC-MBR and MBR gave an average removal rate of 73.39%and 65.01%,respectively.By comparing the trans-membrane pres-sure(TMP)trend of two bioreactors,it could be concluded that activated sludge,with PAC as a carrier,showed higher activity and better filterability than the activated sludge naturally formed,and PAC-MBR ap-peared a slower membrane fouling.