Parameters of biofilter for sanitary wastewater treatment which would treat wastewater intermittently were optimized.The influence on pollutant removal efficiency by effluent amount,different species and diameter of filler and different quality of influent water was studied,results showed that hydraulic loading of the system had inverse relation with removal efficiency of pollutants,with hydraulic loading decreased with increasing of removal efficiency of pollutants.Results also indicated that COD removal r...