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Considered as one of the most important unit processes in a collection system or wastewater treatment plant, screening systems and its associated solids handling systems have evolved into elaborate unit process systems. Course screens were originally provided within collection lift stations and wastewater treatment plant influent pumping stations. These course screen applications were provided to protect down stream pumps or unit processes from being damaged by large debris and/or trash that gets within and transported by the wastewater collection system. However, in the past few years, course screens are now being replaced with finer screens. Fine screens have openings of 0.25 inches (6 mm) or less. Fine screens are now being installed in all types of facilities. In addition, fine screens are being provided within existing course screening facilities that are being retrofitted for the new finer screen. Fine screens have also been provided within the wastewater treatment facilities to protect downstream processes, such as wet weather facilities or membrane bioreactors. These new treatment processes are dictating the importance of effective fine screening. With the rapidly growing demand and use of fine screens, design factors for the selection and operation of the fine screens and their solids handling systems should be reviewed. This paper will provide an overview of the critical design factors associate with designing new fine screening facilities. These factors will include a general overview of the selection of fine screens, hydraulic concerns, solids capture and disposal, and observation of the fine screens during intermittent use.
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Document Type: Research Article

Publication date: 2005-01-01

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