YAO Tong,YU Hua-dong,ZHENG Yuan-wu,et al.Pilot-scale Test on First Grade A Upgrading and Reconstruction of a Wastewater Treatment Plant in a Chemical Industrial Park in Ninbo City[J].China Water & Wastewater,2020,36(19):72-76.
宁波某化工园区污水厂一级A升级改造工艺中试
- Title:
- Pilot-scale Test on First Grade A Upgrading and Reconstruction of a Wastewater Treatment Plant in a Chemical Industrial Park in Ninbo City
- 摘要:
- 为了使出水COD和TN满足《城镇污水处理厂污染物排放标准》（GB 18918—2002）中一级A标准要求，宁波某化工园区污水厂升级改造项目拟采用反硝化生物滤池+臭氧催化氧化组合工艺。为了优化工艺参数，进行了规模为0.1~0.3 m3/h的中试。反硝化生物滤池工艺中试结果表明，当滤速为2~4 m/h、C/N比值为5~6时，对TN的去除率可达85%以上。臭氧催化氧化工艺中试结果表明，当臭氧投加量为65 mg/L、气液比为1.5 ∶1时，对COD的去除效果最好，可将进水COD由117 mg/L稳定降至40 mg/L以下。组合工艺连续运行结果表明，出水COD可稳定在40 mg/L以下、TN可稳定在5 mg/L以下，达到一级A排放标准。
- Abstract:
- In order to make COD and TN in the effluent meeting first grade A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), a wastewater treatment plant in a chemical industrial park in Ningbo City was upgraded by using a combined process of denitrification biofilter and ozone catalytic oxidation. The pilot-scale test with treatment capacity of 0.1-0.3 m3/h was carried out to optimize the operational parameters. When filtration velocity was 2-4 m/h and C/N ratio was 5-6, the removal efficiency of TN in the denitrification biofilter could reach more than 85%. When dosage of ozone was 65 mg/L, and gas-liquid ratio was 1.5 ∶1, COD removal efficiency of the ozone catalytic oxidation process was the best, which could be stably decreased from 117 mg/L to less than 40 mg/L. COD and TN in the effluent of the combined process were always no more than 40 mg/L and 5 mg/L, respectively, which all met the first grade A discharge standard.
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