Abstract
City of Philadelphia's experience and study of the combined sewer overflow pollution problem are described. Water quality legislation and pollution abatement philosophy are considered. The needs for problem definition are delineated along with pertinent constraints of existing methodology and measuring instrumentation. Costs and economic analysis of some abatement schemes are evaluated. Complete separation of stormwater and sanitary wastes, storage in conduit or detention basins, a total systems concept and the microstraining, chlorination, and ozonation of discharges are some of the principles reported for the control and treatment of combined sewer overflows, or both. Emphasis is directed to the determination of priorities in resolving the overall national pollution problem and the need for a systematic approach.
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