合肥市污水处理厂进水水质特征的统计学分析

Statistical Analysis of Influent Water Quality Characteristics of WWTPs in Hefei

选取合肥市24座污水处理厂2019年的进水数据,系统分析进水有机物、氮、磷和悬浮物的分布特征和相关关系。结果表明,BOD5、COD分布符合正态分布,NH3-N、TN、TP和SS分布呈正偏态分布。BOD/COD>0.4的累积概率为83.8%,表明进水可生化性好;BOD/TN>3和BOD/TP>20的累积概率分别为20.9%、82.0%,表明进水碳源不能满足反硝化碳源需求,但基本满足生物除磷需求;SS/BOD>1.1的累积概率为86.3%,进水SS/BOD偏高会严重抑制污泥活性,出水TN有超标风险。Spearman秩相关系数显示,进水各指标间相关性显著,其中BOD5和COD,NH3-N和TN的相关性最强,SS与其余各项指标相关性较弱。结合进水水质特征及新排放标准要求,提出了适用于合肥市污水处理厂的出水达标建议。

Based on the influent water data of 24 WWTPs in Hefei in 2019,distribution characteristics and related relationships of influent water organic matter,nitrogen,phosphorus and suspended solids were analyzed systematically.Results indicated that BOD and COD fitted normal distribution,while NH3-N,TN,TP and SS showed positive skew distribution.Cumulative probability of BOD/COD>0.4 was 83.8%,indicated an adequate biodegradation ability of influent water;the cumulative probability of BOD/TN>3 and BOD/TP>20 were 20.9%and 82.0%,which indicated that the carbon source of influent water could not meet the carbon source demand for denitrification,but meet the demand for biological phosphorus removal basically.Cumulative probability of SS/BOD>1.1 was 86.3%,which high SS/BOD would inhibit sludge activity seriously,and the TN of effluent water had the risk of exceeding the standard.Spearman rank correlation coefficient showed that there was a significant correlation between the indicators of influent water,which the correlation between BOD5 and COD,NH3-N and TN were strongest,while the correlation between SS and other indicators were weak.Combining the characteristics of influent water quality and new discharge standards,some recommendations are made for the effluent compliance with WWTPs in Hefei.