Treatment Efficiency of A~2/MBBR Process for Municipal Wastewater

A pilot-scale study on treatment of municipal wastewater by A2/MBBR was conducted in upgrading and reconstructing the WWTP.The operation requirement could be met by micro-stirring mode in the anaerobic zone with baffled structure.After three months of trial operation,the results showed that under the conditions of temperature equal to or less than 15 ℃,influent rate 25 m3/d,HRT 8.7 h and return ratio 70%,the concentrations of COD,ammonia nitrogen,TN and TP in the effluent reached the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).