ZHANG Ling-ling,CAO Yang,GU Miao,et al.Advanced Nitrogen Removal Technology of Municipal Wastewater under High Discharge Standard[J].China Water & Wastewater,2021,37(13):27-31.
高排放标准下城市污水深度脱氮技术研究
- Title:
- Advanced Nitrogen Removal Technology of Municipal Wastewater under High Discharge Standard
- Keywords:
- municipal wastewater; advanced nitrogen removal; deep bed filter; denitrification; carbon source
- 摘要:
- 在对某城市污水处理厂二级出水中氮组分解析的基础上，研究将深床滤池改造为深床（反硝化）滤池后的脱氮效果、反硝化启动及脱氮影响因素。结果表明，在水温为24～25 ℃、碳源投加量为20～35 mg/L的条件下，历时10 d反硝化功能启动完成，与深床滤池相比，对NO3--N的去除率提高了23.1%，对二级生物处理工艺的脱氮过程起到了有效补充作用。深床（反硝化）滤池去除单位质量NO3--N消耗的COD量随水温降低呈对数增加趋势，低温期采用高碳源投加量提高脱氮效果存在COD超标风险时，需设置出水COD保障单元。
- Abstract:
- Based on nitrogen components analysis in secondary effluent of a municipal wastewater treatment plant, the nitrogen removal performance, denitrification start-up and influencing factors after the deep bed filter was transformed into the deep bed (denitrification) filter were explored. When water temperature and COD (carbon source) were 24-25 ℃ and 20-35 mg/L, the denitrification process was started after 10 days. Compared with the deep bed filter, the removal efficiency of NO3--N was increased by 23.1%, and the deep bed (denitrification) filter was an effective supplement to the denitrification process of the secondary biological treatment process. The COD consumption of unit mass NO3--N removal by the deep bed (denitrification) filter increased logarithmically with the decrease of water temperature. In low temperature period, an effluent COD guarantee unit should be set if there was a risk of effluent COD exceeding the standard as high carbon source dosage was employed to improve the denitrification efficiency.
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