WANGXiang,XUHan-ling,CHENJi-yi,et al.Characteristics of Low Concentration Influent Quality in Municipal Wastewater Treatment Plants in a Southern City[J].China Water & Wastewater,2024,40(15):101-107.
Characteristics of Low Concentration Influent Quality in Municipal Wastewater Treatment Plants in a Southern City
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第15期
Page:
101-107
Column:
Date of publication:
2024-08-01
- Keywords:
- wastewater treatment plant; low concentration influent quality; BOD5 concentration; multivariate statistical analysis
- Abstract:
- A systematic analysis was conducted on the data pertaining to both the influent quantity and quality of 16 wastewater treatment plants (WWTPs) in a southern city over the past 8 years, so as to comprehend the characteristics of influent quality at WWTPs in southern China. From January 2015 to March 2023, the average COD, SS, NH3-N, TN and TP in influent of WWTPs exhibited a general increasing trend, while the average BOD5 in influent showed minimal interannual variation and remained below 100 mg/L. Based on the influent quality data from WWTPs in 2019, the BOD5, COD, SS, NH3-N, TN and TP concentrations were found to exhibit positive skewness, and the ranges with higher cumulative probability distribution were 40-160 mg/L, 100-350 mg/L, 50-300 mg/L, 6-21 mg/L, 15-33 mg/L, 1.5-6.5 mg/L, respectively. The statistical analysis of the ratio of influent indicators indicated that the wastewater exhibited favorable biodegradability and was capable of satisfying the requirements for biological phosphorus removal. However, it faced challenges related to insufficient denitrification carbon sources and susceptibility to collected industrial wastewater. The average influent SS of WWTPs in this city slightly exceeded the national statistical data, while the averages of other indicators were lower than or close to the national statistical data. The primary factors contributing to the low influent concentration included the low concentration of domestic sewage, infiltration of rainwater and external water, mixing of industrial wastewater, pollutants removal by septic tank, as well as the deposition and degradation of pollutants in the drainage network. Corresponding measures could be implemented to enhance the influent concentration and ensure consistent effluent quality.
Last Update:
2024-08-01