MOWen-ting,YANGTao,GUOJun.Upgrading Scheme and Project Design of a WWTP for Quasi-level Ⅲ Surface Water Criteria[J].China Water & Wastewater,2022,38(20):90-95.
污水厂地表水准Ⅲ类标准提标改造方案和工程设计
- Title:
- Upgrading Scheme and Project Design of a WWTP for Quasi-level Ⅲ Surface Water Criteria
- Keywords:
- upgrading and reconstruction; denitrification deep-bed filter; three-step ozone catalytic oxidation; dissolved air flotation
- 摘要:
- 武汉某污水处理厂现状出水水质执行一级A标准，提标改造工程要求出水水质执行地表水准Ⅲ类标准（TN≤6 mg/L）。根据现状处理效果分析，提标改造工程的处理难点是TN、COD和TP的深度去除，需增加对应的专用深度处理单元。根据污染物去除机理和中试研究结果，深度脱氮单元采用反硝化深床滤池工艺，深度降解COD单元采用三级臭氧催化氧化工艺，深度除磷单元采用溶气气浮工艺。此外，通过中试确定了溶气气浮工艺的絮凝剂投加量和回流比、臭氧催化氧化工艺的O3消耗量与COD去除量的质量比以及催化剂填充高度。
- Abstract:
- The current effluent quality of a wastewater treatment plant (WWTP) in Wuhan implements with first level A discharge standard, which will be promoted to quasi-level Ⅲ criteria of surface water (TN≤6 mg/L) in its upgrading and reconstruction project. Based on the analysis of current treatment effect, further removal of TN, COD and TP is regarded as the difficulty of the project and the correspondingly special advanced treatment process shall be supplemented. According to the results of the mechanism analysis for pollutants removal and the pilot study, denitrification deep-bed filter, three-step ozone catalytic oxidation and dissolved air flotation are selected for the further removal of TN, COD and TP, respectively. Besides, the flocculant dosage and reflux ratio of dissolved air flotation, the mass ratio of O3 consumption to COD removal and loading height of catalyst bed in ozone catalytic oxidation are determined based on the results of pilot study.
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