Abstract
An anoxic moving bed biofilm reactor (ANMBBR) followed by an aerobic moving bed biofilm reactor (AEMBBR) operated as pre-denitrification system was used to investigate the effect of different influent NO3--N concentrations on performance of the pre-denitrification system in treating real coal gasification wastewater. Influent NO3--N concentration was controlled at 50, 100, 200, and 400 mg/L during the experiments. Evolution of COD and phenols in the effluent of the ANMBBR and AEMBBR, and performance of nitrification in the AEMBBR with different influent NO3--N concentrations were studied. Almost complete denitrification was achieved when influent NO3--N concentration was 100 mg/L. NO3--N and NO2--N accumulated in the effluent of the ANMBBR with influent NO3--N concentrations of 200 and 400 mg/L. NO3--N concentration of 400 mg/L facilitated high NH4+-N removal efficiency in the AEMBBR when influent NH4+-N concentration was around 165 mg/L. The ratio of CODconsumed/NO3--Nconsumed along with phenols removal of the ANMBBR under different influent NO3--N concentrations was discussed.
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