Pilot Test of Dual-Mode MSBR for Wet Weather Flow Treatment in Urban WWTP
Domestic urban WWTPs experience hydraulic shock loads which increase drastically during wet weather.The WWTPs are insufficient in handling the peak wet weather combined flow as the treatment capacity of secondary treatment processes is based on dry weather flowrate,which causes overflow ahead of WWTPs or internal bypass inside the WWTPs.The overflow and bypass lead to severe pollution of receiving water.This pilot test was conducted in a WWTP in Zhejiang to determine the peak wet weather biological treatment capacity achievable of dual-mode MSBR with step feed capability.The results demonstrated that a peak wet weather secondary treatment capacity from 2～4 times dry weather flow rate could be maintained,meanwhile the effluent limits such as CODCr,ammonia nitrogen,total nitrogen(TN)could be maintained at or lower than first class A criteria specified of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002),among which average ammonia-nitrogen was below 1.0 mg/L,average TN was below 10 mg/L.The results also demonstrated that dual-mode MSBR is remarkably better than any physical-chemical enhanced primary treatment processes in removal efficiency.A new solution is provided to achieve a significant increase in peak wet weather treatment capacity of WWTPs,a remarkable decrease in receiving water's pollution,and the end of malodorous and black water.
国家科技期刊平台
NSTL
万方数据
维普
