Abstract
Some azo dyes such as Acid Orange 7(AO7) could be reduced to produce aromatic amines with a hydroxy group in ortho-position to an amino group, which undergo easily the autoxidation, led to the generation of more recalcitrant compounds. Therefore AO7 biodegradation was explored in a membrane-aerated bioreactor (MABR) for the first time. The results indicated that, oxygen supply pressure showed obvious impact on the MABR performance with appropriate oxygen pressure of 0.03 MPa; under optimal conditions, AO7decolorization efficiency reached over 98 % in 6 h and the effluent COD kept stable with COD specific removal rate of 0.26 g/m2.h; whereas conventional anaerobic-aerobic process achieved only 57.8 % COD removal with yellow effluent; the used silicone membrane resist biofouling and kept high oxygen permeability after long term running, oxygen transfer coefficient KL decreased slightly from 0.031 to 0.029 m/h.
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