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上海的主要水源是黃浦江,由于工业废水和生活污水的大量排放,使水质每况愈下。盛夏时节尤甚,江中污泥泛起,有害物质含量上升,黑臭难闻。据78年统计,黄浦江黑臭期竟长达106天,近几年又有继续延长的趋势,从而严重威协着全市一千万人民的健康,也给工业用水的处理造成极大困难。为此,开发水处理技术,合理用水,节约用水,保护水资源已成为当前国民经济发展中亟待解决的重大课题。每年冬春长江枯水期,黄浦江水位低落,海水倒灌,造成江水含盐量骤增。吴淞与杨树浦一带,江水含盐量高达数千余毫克/升,据统计,78年由于天气干早,倒灌期长达198天,海水上溯南市、吴泾地区,据对13家重点厂的调查,由于海水倒灌造成的直接经济损失就达800
The main source of water in Shanghai is the Huangpu River, which has been deteriorating due to the massive discharge of industrial wastewater and domestic sewage. Especially in the midsummer, the sludge in the river is thrown up and the content of harmful substances rises. The black and foul smell is unpleasant. According to statistics from 78 years, the black and odor period of the Huangpu River was as long as 106 days. In recent years, it has continued to prolong, which has seriously threatened the health of 10 million people in the city and caused great difficulties in the treatment of industrial water. For this reason, the development of water treatment technologies, rational use of water, water conservation, and protection of water resources have become major issues to be solved in the current development of the national economy. Every year in the dry season of the Yangtze River in winter and spring, the Huangpu River has a low water level and seawater intrusion, causing a sudden increase in salt content in the river. According to statistics, due to dry weather in 78 years, up to 198 days of back irrigation, seawater traced back to Nanshi City and Wusong region, according to statistics from 13 key factories, according to statistics from Wujing and Yangshupu. The direct economic loss caused by seawater intrusion reaches 800