Aiming at low concentration parachlorophenol wastewater discharged from a chemical works in Pearl River Delta,the biodegradation efficiency of parachlorophenol by aerated bio-packing tower and influencing factors were studied.Results showed that the effect of factors including initial concentration,DO concentration,HRT and glucose concentration were significant.The wastewater could be biodegraded to 0.894mg/L with initial concentration below 31mg/L and HRT 80h,which can satisfy national criteria of 1mg/L.Op...