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Fish Exclusion Screens
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Sustainability principles and government regulations frequently require that effluent water be screened to prevent escapement of fish from aquaculture facilities. Traditional static screen systems have typically had high hydraulic head requirements and/or have required significant labour to prevent screen fouling. PR Aqua’s solution is a self-cleaning conveyor belt screen that provides complete exclusion of fish and eggs from aquaculture facility discharge water while requiring only minimal head and maintenance labour.
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How It Works
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The effluent flow is directed horizontally through the inclined screen belt, removing aquaculture waste as well as screening for escaped eggs and fish. As particulate matter is screened from the flow and collects on the screen filter media, the water level within the filter tank on the upstream side of the screen rises. The rising water initiates an automatic backwash system which moves the conveyor belt upwards, over the roller, and past the belt scraper and the backwash spray bar. Solids, eggs, and fish are collected in a catchment tray with a screened outlet, allowing backwash water to drain to the outlet side of the filter, while solids are retained within the tray for manual removal.
An optional overflow tank, featuring three static screens, may be provided to ensure the efficacy of fish exclusion is maintained during an overflow event.
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