| The effect of the advanced treatment of domestic wastewater by using membrane bioreactor was investigated. Long-term operation had showed that the membrane bioreactor(MBR) had a good effect on the removal of chemical oxygen demand(CODcr), ammonia nitrogen( NHs-N), solid suspended substance(SS). The quality of the effluent had good stability, and the treated wastewater can be reused. The membrane fouling is divided into two parts: hydraulic cleanable and hydraulic uncleanable, based on the effects of hydraulic cleaning. A newly designed apparatus is employed to control the cake layer fouling on-line, coupled with the intermittent operating system, the hydraulic cleanable fouling is decreased. Based on the effects of different chemical cleaning methods hydraulic uncleanable fouling is subdivided into organic fouling, inorganic fouling and biologic fouling. On-line chemical cleaning of irreversible fouling was studied. Finally a surfactant was employed to minimize biologic fouling, with which the membrane surface is modified. |
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