PIAOHeng,WANGXiao?dong,WUYu?xing,et al.Influence of Rainfall on Influent and Effluent Characteristics of Wastewater Treatment Plants in Separate Sewer Area with Illicit Connection[J].China Water & Wastewater,2022,38(17):88-92.
Influence of Rainfall on Influent and Effluent Characteristics of Wastewater Treatment Plants in Separate Sewer Area with Illicit Connection
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第17期
Page:
88-92
Column:
Date of publication:
2022-09-01
- Keywords:
- separate sewer system; wastewater treatment plant; illicit connection; analysis of variance (ANOVA); correlation analysis
- Abstract:
- The mixed pollution of rainwater and sewage in the separate sewer system of Qingdao and its impact on downstream wastewater treatment plants (WWTPs) during rainfall period was investigated. Analysis of variance (ANOVA) was used to analyze the influent and effluent quality of WWTPs during wet period and dry period. The significant difference of water quality and quantity at the end of the sewer system (influent of WWTPs) during wet period and dry period was tested, and a correlation analysis of the change degree of the related water quality indices was carried out. The dissolved COD (SCOD), ammonia nitrogen and total phosphorus in influent of WWTPs in the wet period were significantly lower than those in the dry period, which decreased by 52%, 40% and 40%, respectively (P=0.000). There was a significant negative correlation between influent SCOD and SS in the wet period, and the correlation coefficient was -0.467 0. Due to the flush effect of rainfall on road surface sediments and pipeline sediment, the influent SS and COD of the WWTPs during light rain or moderate and heavy rain period increased by nearly 30% compared with those in the dry period. However, the ammonia nitrogen and total phosphorus decreased by 40%-50% due to the dilution effect.
Last Update:
2022-09-01