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Denitrification of nitrified effluent with high concentration of nitrate, low COD in fertilizer plant was carried out in a 12-l gas-liquid-solid three-phase flow airlift loop bioreactor, in which biological membrane replace the activated sludge. The influences of pH, temperature, C/N ratio, gas-liquid ratio and HRT on the removal of nitrate-nitrogen were investigated and discussed. The optimum operation...