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Screening has emerged as a major technology used for addressing unsatisfactory Combined Sewer Overflows (CSOs) in the UK and other countries. The paper outlines results of short term testing and evaluation of CSO screen and chamber configurations conducted at the UK National CSO Test Facility. It highlights the key attributes of the ideal CSO screening system and advocates the need for assessing the robustness and the maintenance and operational aspects of CSO screening systems operating in the unpredictable harsh combined sewer environment.

A novel non-powered self-cleansing screening system with no moving parts is described in detail. The key features of the system are related to the attributes of the ideal CSO Screen and outputs of long term field monitoring (including telemetry data) to assess its long-term operational performance, durability and maintenance requirements, are outlined. Recent developments to enhance screen performance and reduce footprint are also outlined.

The novel system is shown to offer robust, reliable, flexible and effective CSO screening. The paper recommends adoption of a more holistic approach to CSOs involving the combination of screening with other unit processes to provide not just aesthetic pollutant removals but removal of settleable solids (including sediments and their associated pollutants) coupled with disinfection where necessary.
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Document Type: Research Article

Publication date: 2002-01-01

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