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Abstract Fermentation liquid of food waste (FLFW) was applied as external carbon to a pilot-scale A/O-MBR to explore the characteristics of nitrogen removal and membrane fouling under different dosage and HRT. Results demonstrated that FLFW and sodium acetate characterized similar specific denitrification rate (SDNR) and COD utilization efficiency, but both of them are higher than that of glucose. It was also found that the FLFW can stimulate the activity of biomass and enhance denitrification processes significantly, which further improved nitrogen removal. The TN removal efficiencies increased with the addition of FLFW. In addition, after adding FLFW, the EPS did not accumulate in reactor and the membrane fouling rate (FR) increased slightly. Chemical clean can effectively remove membrane foulants and recover the permeability. Lengthening the HRT was more advantageous in nitrogen removal and membrane fouling control.
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Received: 25 March 2015
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