Combined Sewer System (CSS)  A CSS is a sewer system that transports both sanitary wastewater and stormwater.

In dry weather, all flow goes to a wastewater treatment plant. In wet weather, capacity may be exceeded. Unfortunately, most CSSs are designed to discharge excess flow directly to surface water such as rivers, streams, estuaries and coastal water.

Sanitary Sewer System (SSS)  A SSS is sewer system that conveys domestic, commercial and industrial wastewater to a treatment plant, with limited amounts of infiltrated groundwater and stormwater.

SSSs are not designed to collect large amounts of stormwater runoff from weather events. Areas served by SSSs have a separate storm water system to collect and convey runoff from rainfall and snowmelts.

Combined Sewer Overflow (CSO) CSO is Overflow from a Combined Sewer System.

Sanitary Sewer Overflow (SSO) SSC is Overflow from a Sanitary Sewer System.

What’s the Big Deal with CSOs and SSOs?
Both CSOs and SSOs contain untreated or partially treated water. Whether they are caused by a limited capacity, line breaks, blockages or lapses in maintenance, overflows release microbial pathogens, pollutants and toxins to surface waters – all of which negatively impact the environment and human health.

What Has Been Done?
CSOs are a nationwide problem. In 1994, the federal government developed the CSO Control Policy which suggests that States:

• Implement a tracking method, preferably the permit program created by the federal Clean Water Act
• Develop Long-Term Control Plans (LTCPs)
• Communities implement CSO controls as soon as possible

What Technology is Available?
Readily available options range from large-scale capital improvement projects to improved maintenance practices. A community’s action plan would be influenced by the size and type of system, the problems they are experiencing, their performance goals and available resources.

In the US Environmental Protection Agency (EPA)’s 2004 “Report to Congress on the Impacts and Control of CSOs and SSOs”, the EPA categorized technologies used to address CSOs and SSOs into 5 categories:

1. Operation and Maintenance Practices
2. Collection System Controls
3. Storage Facilities
4. Treatment Technologies
5. Low-Impact Development Techniques

MultiTrode Can Help
MultiTrode takes pride in designing, manufacturing and marketing pump station management systems that improve the integrity of the nation’s wastewater infrastructure and protect both the environment and public health. We offer a wide range of products including complete control panels, pump station controllers, pump station supervisors, RTUs, liquid level sensors, liquid level relays, SCADA software and web-based monitoring and control solutions.

MultiTrode utilizes technological advancements to provide sophisticated solutions to every day challenges. Supervisory Control & Data Acquisition (SCADA) ranks among the more noteworthy of these tools. SCADA can be used as a safeguard against overflows and to gain centralized electronic control. Utilized as a broader management tool, SCADA can reduce staff overtime, help in preventive maintenance scheduling and enhance the operational cost efficiencies of a utility. Read more…

Industry Clean Water Act, Combined Sewer Overflow, Combined Sewer System, CSO, CSS, liquid level sensors, Pump Station Management, Sanitary Sewer Overflow, Sanitary Sewer System, sewer, sewer system, SSS, stormwater, water