Treatment of rural domestic wastewater by modular biological filter and constructed wetland
The commonly used rural sewage treatment process of Anaerobic Tank+Aerobic Biological Filter was taken as the research object,the aerobic biological filter was designed modularly and combined with constructed wetlands.The filter effluent flowed into the subsurface flow constructed wetland.The removal effect of CODCr,NH4+-N,TN and TP was investigated through the operation parameters regulation,which made it a new combined treatment device for rural domestic sewage.The experimental results show that when the reflux ratio of aerobic biofilter was 300％and the interval of water distribution was 2 min∶8 min,NH4+-N,TN,COD and TP in the effluent of the combined process met the water quality requirements in the first-class A standard of Discharge Standard of Water Pollutants for Rural Domestic Sewage Treatment Facilities(DB32/3462-2020).Microbial community analysis at different heights from the top of filter bed reveals a diverse microbial composition within the filter,which was primarily dominated by the Proteobacteria and Firmicutes phyla.Microbial analysis and redundancy analysis at the genus level suggests that nitrogen removal primarily occurred in middle and lower part of the filter bed.
rural domestic sewagemodular biofilterbiological nitrogen removalmicrobial community
国家科技期刊平台
NSTL
万方数据
