| The .effect of the treatment of micro-polluted raw water by using membrane bioreactor Was investigated .Long-term operation has showed that the membrane bioreactor(MBR) had a good effect on the removal of the chemical oxygen demand(CODMn),ammonia nitrogen(NH3-N), solid suspended substance(SS) and UV254. The result are CODMn 47.45%, NH3-N 79.29% and SS nearly 100%.However,the removal of UV254 was not so good .PACT-MBR and MBR-GACC were investigated. As a result, The removal of UV254 are 35.86%m 50.94%,and the quality of the effluent had good staility. The characteristic of the membrane fouling is investigated when the membrane bioreactor is used to treat micro-polluted source water. The sludge layer removal device and non-continuous suction operation are introduced as fouling alleviating alternatives. The irreversible membrane fouling occurred when the suction operated. The irreversible membrane fouling also could be released by modifying membrane surface with surfacetant. |
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