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.
硫自养反硝化技术用于市政污水深度处理
- Title:
- Application of Sulfur Autotrophic Denitrification Technology in Advanced Treatment of Municipal Sewage
- Keywords:
- municipal sewage; advanced treatment; sulfur autotrophic denitrification filter; immobilization technology
- 摘要:
- 去除总氮是污水处理厂面临的一大难题。目前市政污水深度处理普遍采用的反硝化滤池需要额外投加碳源，不仅运行成本高，而且存在BOD5超标风险，而采用硫自养反硝化滤池不仅运行成本低，而且避免了出水BOD5超标的风险。某实际工程运行结果显示，在冬季低温平均12.8 ℃、出水pH为6.5以上、HRT为1.6 h的情况下，微生物驯化启动时间约为12 d，驯化完成后出水NO3--N稳定在5 mg/L以下，平均氮去除负荷为0.19 kgNO3--N/（m3·d），平均氮去除率达到90%，表现出较好的反硝化效果，但反洗后恢复反硝化效果需约1.5 d。反洗周期为5~10 d，运行成本约0.065元/m3。运行成本较投加碳源的异养反硝化滤池减少50%以上。该项目改造投资为400万元，预计3年左右可收回投资成本。
- 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.
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