千岛湖引水工程实施前后杭州主城区出厂水水质变化研究

Study on the change of water quality of the water supply in the main urban area of Hangzhou before and after Qiandao lake water diversion project

为探究千岛湖引水工程对杭州主城区供水水质的影响,2019至2020年期间,持续定期采样检测,研究分析了工程实施前后主城区各水厂原水及出厂水水质变化趋势。结果显示,引水后5家水厂原水水质呈更优更安全趋势;出厂水安全指数提升,口感更佳。单样本t检验及两独立样本t检验结果显示,5家水厂原水及出厂水引水前后均具极显著差异;引水前原水与千岛湖水源水呈极显著性差异,引水后无显著性差异或差异较引水前更小。常规处理工艺水厂出厂水较深度处理工艺出厂水水质提升更为显著。但也存在"低浊"等问题,水厂运营过程中需特别关注。

In order to study the influence of the Qiandao lake river diversion project on the water quality of the water supply in the main urban area of Hangzhou, from 2019 to 2020, the variation trend of the water quality of the raw water and ex-factory water in the main urban area before and after the implementation of the project was analyzed by continuous periodic sampling and testing. The measured value analysis shows that the raw water quality of 5 water plants is better and safer after water diversion, and the ex-factory water safety index is improved and the taste is better. The results of single-sample t-test and two independent-sample t-test showed that there are significant differences between the raw water of five waterworks and the raw water before and after diversion, and between the raw water before diversion and the raw water of Qiandao lake, there is no significant difference or less differencen. The quality of effluent from conventional treatment process is better than that from advanced treatment process.