QIYa-ling,DIJian-ying,LINJia,et al.Application of Biological Aerated Filter with Multi-mode Operation in Advanced Treatment of WWTP[J].China Water & Wastewater,2022,38(20):85-89.
曝气生物滤池多模式运行用于城镇污水厂深度处理
- Title:
- Application of Biological Aerated Filter with Multi-mode Operation in Advanced Treatment of WWTP
- Keywords:
- advanced treatment; biological aerated filter; multi-mode operation; simultaneous nitrification and denitrification
- 摘要:
- 南方某城镇污水处理厂出水水质从《城镇污水处理厂污染物排放标准》（GB 18918—2002）的一级A标准提高至地表水Ⅳ类标准（总氮≤15 mg/L），需新建深度处理单元（曝气生物滤池和磁混凝沉淀池），其中曝气生物滤池要求具有同时去除COD、BOD5、TN、氨氮的功能。滤池进水可能存在仅氨氮超标、仅总氮超标、氨氮和总氮同时超标等情况，曝气生物滤池单体设计时考虑以上3种工况，每个工况都有相应的进、出水水质要求和工艺设计参数。在传统曝气生物滤池的基础上，对进水分配方式、碳源投加方式、出水回流方式、曝气系统等方面进行了优化改进。在现有二级生物处理单元出水水质不超过滤池设计进水边界条件的情况下，通过运营调整，可实现硝化、反硝化或同步硝化反硝化的多种模式灵活运行，降低了运营风险。
- Abstract:
- The effluent discharge standard of a wastewater treatment plant (WWTP) in southern China had been raised from the first level A criteria in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002) to level Ⅳ criteria in Environmental Quality Standards for Surface Water (GB 3838-2002) (except TN≤15 mg/L), thus the biological aerated filter (BAF) for removing COD, BOD5, TN and ammonia nitrogen, and magnetic coagulation sedimentation tank were built as the new advanced processing units. The three possible influent conditions including only ammonia nitrogen exceeded, only total nitrogen exceeded, both ammonia nitrogen and total nitrogen exceeded are considered in the design of BAF and each design condition has the corresponding influent and effluent quality and process design parameters. Based on the traditional BAF, the influent distribution mode, the carbon source dosage mode, effluent reflux mode and aeration system have been optimized and improved. Through flexible operation, the BAF can realize nitrification only, denitrification only, or simultaneous nitrification and denitrification, under the condition that the effluent quality indexes of the existing secondary biological treatment process do not exceed the design condition of the filter, which reduces the operation risk.
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