LIUBao-feng,GUOYu-ping.Application of Sulfur Autotrophic Denitrification Technology in Advanced Treatment of Municipal Sewage[J].China Water & Wastewater,2022,38(22):91-95.
Application of Sulfur Autotrophic Denitrification Technology in Advanced Treatment of Municipal Sewage
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第22期
Page:
91-95
Column:
Date of publication:
2022-11-17
- Keywords:
- municipal sewage; advanced treatment; sulfur autotrophic denitrification filter; immobilization technology
- Abstract:
- Removal of total nitrogen is a major problem for sewage treatment plants. At present, the denitrification filter widely used in the advanced treatment of municipal sewage needs to add additional carbon sources, which result in two problems of high operation cost and the risk of BOD5 exceeding the effluent standard. While the use of sulfur autotrophic denitrification filter not only has low operation cost, but also avoids the risk of BOD5 exceeding the standard of effluent. A project operating results showed that under the low temperature of 12.8 ℃ in winter, effluent pH of above 6.5, and HRT of 1.6 h, the initiation time of microbial acclimation was about 12 days and showed good denitrification effect. The effluent NO3--N was stably below 5 mg/L, the average daily nitrogen removal load was 0.19 kgNO3--N/(m3·d), and the average nitrogen removal rate reached 90%. However, it took about 1.5 days to recover the denitrification effect after backwashing. The backwash cycle was 5-10 d and the operating cost was about 0.065 yuan/m3. The operating cost reduced by 50%, compared with that of denitrification filter with the carbon source. The project investment was 4 million yuan, which is expected to be taken back in about 3 years.
Last Update:
2022-11-17