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 21):87-92.
Evaluation and Analysis of Wastewater Treatment Plant Operation in Residential and Industrial Hybrid Areas
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
21 21
Page:
87-92
Column:
Date of publication:
2020-11-01
- 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.
Last Update:
2020-11-01