Wastewater source control system

Abstract

A wastewater source control system for use with a sewer service line conducting a flow of wastewater from a building to a sewer main. A flow control device is installed in the sewer service line with an upstream detention tank to detain building wastewater upstream from its point of discharge into a sewer main during certain heavy stormwater runoff periods.

Description

[0001] This application is a continuation-in-part of application Ser. No. 10 / 678,009, filed on Oct. 2, 2003, which is hereby expressly incorporated by reference herein.FIELD OF THE INVENTION [0002] This invention relates to sewage collection systems including both sanitary sewers and combined sewers. BACKGROUND OF THE INVENTION [0003] For purposes of clarification and understanding of this document, the following definitions are set forth. The term “wastewater” designates contaminated domestic wastewater such as “sanitary sewage” as well as water that carries away other waste matters from households, mercantile, commercial, and industrial establishments. “Stormwater” refers to rainfall runoff waters collected in sewers. “Extraneous inflows” refer to waters that enter a sewer collection system by infiltration from ground waters and by inflow from surface water sources especially during stormwater runoff periods. “Combined sewer systems” carry “combined sewage” that is a mixture of wa...

AI Technical Summary

Benefits of technology

[0008] The present invention is a sewage control system that prevents or reduces the pollution content of combined sewage or wastewater mixtures which often overflow from sewer systems into watercourses, streams, rivers, lakes, oceans, and other receiving bodies of water as a result of heavy rainfall runoff and infiltration.

[0012] By detaining building wastewater upstream from its point of discharge into a sewer main during certain heavy stormwater runoff periods, the creation of combined or mixed sewage is prevented or to some substantial degree avoided, thereby reducing CSO and SSO pollution concentrations.

Problems solved by technology

However, when heavy stormwater flows occur, combined sewer flows often exceed the flow capacity of the interceptor; and the overflow is diverted into a receiving watercourse such as a natural stream or river.

However, in high rainfall climates over an annual period, CSOs may be a frequent occurrence resulting in receiving water pollution.

Although separate wastewater sewer systems are intended to carry mainly domestic wastewater, during high rainfall runoff periods, they also may become overloaded due to extraneous inflows and therefore, carry a wastewater mixture, which is usually a more concentrated form of combined sewage.

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