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| Combined internal electrolysis/SMBR process for treatment of reactive anthraquinone dye wastewater |
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Abstract Wastewater containing reactive brilliant blue X-BR anthraquinone dye was treated by internal electrolysis coupled with submerged membrane bioreactor (SMBR), in which the self-made PVDF hollow fiber membrane modules were applied. During the experiments performance of SMBR-3 with internal electrolysis water directly entering was compared with SMBR-4 in which water entered after regulating pH to 9~10. The rates of both two SMBR on CODCr and NH4+-N removal were high, but the efficiency on TN removal was very different, in which SMBR-3 had a high rate of 92.9% compared to just 67.5% for SMBR-4. The mean particle diameter of activated sludge in SMBR-3 was 34μm bigger than SMBR-4, and the change of EPS quantity was in the same trend. Some extra filamentous bacteria in microorganism surface texture were observed in solution which predicted the relative intricacy of cultures. The bio-ferric sludge forming in SMBR-3 was found to be useful to alleviate membrane fouling and made the flux decline become slower.
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Received: 08 June 2010
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