YIN Hai-long,LIAN Qing.Evaluation and Analysis of Wastewater Treatment Plant Operation in Residential and Industrial Hybrid Areas[J].China Water & Wastewater,2020,36(21):87-92.
生活和工业融合区污水处理厂运行评估分析
- Title:
- Evaluation and Analysis of Wastewater Treatment Plant Operation in Residential and Industrial Hybrid Areas
- 摘要:
- 以我国城镇化程度高和工业企业众多的江苏省部分区域为调查对象，选择6个地级市的62座城市污水处理厂，分析了污水厂进水水质和活性污泥系统的运行特征。受调查的污水处理厂进水COD、BOD5、SS、NH3-N、TN和TP的中位值分别为223、86.6、127、22.8、30.8和2.97 mg/L，表现为进水碳源不足和含有难降解COD。难降解工业废水的接入造成污水厂进水BOD5浓度降低最为明显和相应的SS/BOD5值偏高；进水BOD5浓度最低为38.5 mg/L，SS/BOD5值最高为5.8。活性污泥系统MLVSS与MLSS比值的中位值为0.52，最低为0.32，与污水营养物不足导致的活性污泥分解和工业废水中带入的无机细颗粒物在活性污泥中累积有关。为了满足城镇污水处理提质增效行动方案中对污水处理厂进水BOD5的要求（BOD5≥100 mg/L），除了加强管网排查和修复外，还应对工业企业接管进行评估和实施工业废水集中处理。
- Abstract:
- A survey was carried out in some areas of Jiangsu Province with a high degree of urbanization and a large number of industrial enterprises, in which 62 municipal wastewater treatment plants (WWTPs) in six cities were selected to analyze the influent quality and operational characteristics of activated sludge system. Monthly median concentrations of COD, BOD5, SS, NH3-N, TN and TP in influent of the WWTPs were 223 mg/L, 86.6 mg/L, 127 mg/L, 22.8 mg/L, 30.8 mg/L and 2.97 mg/L, respectively, indicating that the carbon source was insufficient and refractory COD was present. Refractory industrial wastewater entering into municipal WWTPs resulted in the most significant decrease of BOD5 concentrations in the influent and corresponding higher ratio of SS to BOD5. The lowest BOD5 concentration in the influent was 38.5 mg/L, and the highest ratio of SS to BOD5 was 5.8. The median and the lowest ratios of MLVSS to MLSS were 0.52 and 0.32, respectively, which was associated with activated sludge decomposition caused by insufficient nutrients supply and accumulation of inorganic fine sediments from industrial wastewater within the activated sludge. In order to meet the requirement of BOD5 concentration in the influent more than 100 mg/L in action plan for improving quality and efficiency of municipal wastewater treatment, attentions should be paid to assessment of enterprises with industrial wastewater entering into municipal sewers and implement of centralized industrial wastewater treatment, apart from strengthening sewer pipes inspection and repair.
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