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.
降雨对混接分流制地区污水厂进出水特征的影响
- Title:
- Influence of Rainfall on Influent and Effluent Characteristics of Wastewater Treatment Plants in Separate Sewer Area with Illicit Connection
- 关键词:
- 分流制管网; 污水处理厂; 雨污混接; 方差分析（ANOVA）; 相关性分析
- Keywords:
- separate sewer system; wastewater treatment plant; illicit connection; analysis of variance (ANOVA); correlation analysis
- 摘要:
- 为研究青岛市分流制管网在降雨期的雨污混流程度及其对下游污水处理厂的影响，采用方差分析（ANOVA）数据统计方法对污水处理厂在降雨期和非降雨期的进出水水质进行分析，对分流制管网末端（污水处理厂进水）在降雨期和非降雨期的水质、水量差异显著性进行了检验，并对相关水质指标的变化程度进行了相关性分析。结果表明，降雨期污水处理厂进水溶解性COD（SCOD）、氨氮、总磷等污染物浓度显著低于非降雨期，降低幅度分别为52%、40%、40%（P=0.000），降雨期SCOD与SS呈明显的负相关性，相关性系数为-0.467 0。由于降雨对道路表面沉积物和管道淤积物的冲刷效应，在小雨以及中到大雨条件下，污水处理厂进水SS和COD浓度比非降雨期增加了30%左右，而进水氨氮、总磷等指标浓度受雨水稀释作用的影响下降了40%~50%。
- 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.
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