GAOYang,ZHOULi,LILing-yun,et al.Deep Bed Denitrification Filter for Advanced Treatment of Municipal Wastewater and Its Microbial Characteristics[J].China Water & Wastewater,2022,38(19):54-60.
Deep Bed Denitrification Filter for Advanced Treatment of Municipal Wastewater and Its Microbial Characteristics
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第19期
Page:
54-60
Column:
Date of publication:
2022-10-01
- Keywords:
- deep bed denitrification filter; municipal wastewater; advanced treatment; microbial characteristics; high-throughput sequencing
- Abstract:
- A gas-water distribution system with circular stainless steel screen as the main structure was used in deep bed denitrification filter (DBDF). The effluent from a high-efficiency sedimentation tank of a municipal wastewater treatment plant was treated in a pilot scale test, and the diversity and microbial community of the suspended sludge, biofilm on the filter packing media and sludge in the biochemical tank before and after backwashing were investigated by high-throughput sequencing technology. The DBDF showed good performance for advanced treatment of the effluent from the sedimentation tank. When the influent TN was between 7.25 mg/L and 15.27 mg/L, the effluent TN was always less than 5.00 mg/L, and the effluent TP, SS and COD could stably reach the A criteria specified in Discharge Standard of Water Pollutants for Municipal Wastewater Treatment Plants (DB 11/890-2012). The TN load removed by the sludge in the biochemical tank was only 31.48% of that by the sludge in DBDF. Compared with the sludge in the biochemical tank, the microbial community of the sludge in DBDF had smaller species difference and lower richness, and the relative abundance of bacterial genera related to denitrification process was higher. Filter backwashing had little effect on the microbial community of sludge in DBDF. However, it would lead to the growth of some aerobic denitrifying bacteria with low relative abundance and poor nitrogen removal performance in a period of time.
Last Update:
2022-10-01