基于达标保证率的昆明市污水处理厂出水水质评价

Assessment of effluent quality of wastewater treatment plant in Kunming based on the percentile of standard compliance method

采用多元统计分析,将水质分级评价法和达标保证率法相结合,评价了昆明市7座污水处理厂出水水质.以《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A限值为达标基准,7座污水处理厂出水COD达标保证率均为100%、出水BOD5和SS达标保证率分别在94%和95%以上,不同污水处理厂出水TP、NH3-N和TN的达标保证率表现出较大差异,多维标度分析表明,出水TP的达标保证率与其他指标的偏离程度最大.将污染指标的达标保证率进行分级,建立污水处理厂污染指标达标满意程度评价规则,并制定出水水质的达标控制指标清单.结果表明,TP是第二和第七污水处理厂的重点控制指标,是第三污水处理厂的Ⅰ级控制指标;TN是第三和第七污水处理厂的Ⅰ级控制指标;NH3-N是第一和第三污水处理厂的Ⅰ级控制指标.

The effluent quality of seven wastewater treatment plants （WWTPs） in Kunming was assessed by using multivariate statistical analysis, combining classification evaluation and percentile of standard compliance. According to Level I-A of ＂Discharge standard of pollutants for municipal wastewater treatment plant＂ （GB18918-2002）, the compliance percentiles of COD in the effluent of the 7 WWTPs were all 100%, BODs and SS were above 94% and 95%, respectively. The percentiles of standard compliance of TN, TP and NH3-N presented much difference. The deviation of TP was highest among all the indicators by the multidimensional scaling analysis. The inventory of the control indicator for standard compliance of the effluent of Kunming WWTPs was established, with classifying the percentile of standard compliance of the effluent and formulating the rules for water quality assessment of the effluent of WWTPs. The results showed that TP was the key control parameter of the 2rid WWTP and the 7th WWTP, and was the first priority control parameter of the 3rd WWTP. Meanwhile, TN was the first priority control parameter of the 3rd WWTP and 7th WWTP, and NH3-N is the first priority control parameter of the 1 st WWTP and 3rd WWTP in Kunming.