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原文传递 Progress in Water Quality: An Evaluation of the National Investment in Municipal Wastewater Treatment. Executive Summary

题名：	Progress in Water Quality: An Evaluation of the National Investment in Municipal Wastewater Treatment. Executive Summary
关键词：	Waste water treatment; Water pollution control; Sewage treatment plants; Government funding; Water quality; Waste water disposal; Municipal wastes; Clean Water Act; Program evaluation
摘要：	The national investment is demonstrated by the increase in the number of people served by (POTW), which shifted dramatically between 1968 (before CWA) (Clean Water Act) and 1996 (after CWA). The overall number of people relying on POTWs with less than secondary treatment dropped rapidly after passage of the 1972 CWA. In 1968 about 39 percent (54.2 million) of the 140.1 million people served by POTWs received less than secondary treatment (raw and primary). By 1996 this percentage was reduced to about 9 percent (17.2 million) of the 189.7 million people served by POTWs. While the number of people served by POTWs with secondary treatment remained fairly constant between 1968 and 1996 (a slight decrease of 3.7 million people or about 4 percent of the population), the number of people provided with greater than secondary treatment increased significantly (from 0.3 million people in 1968 to 82.9 million people in 1996).
总页数：	28p
报告类型：	科技报告