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Swirl Separators
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The more quickly solids are removed from your system, the less time they have to break down and release nutrients and toxins into your culture water. Attaching a swirl separator to your culture tank bottom drain, or to a series of them, provides a good first step in solids removal and reduces the solids-loading to downstream treatment equipment. Ideally the culture tanks are fitted with dual drains (a side outlet in addition to the bottom drain) so the swirl separator is only receiving a fraction of the tank effluent where settleable solids have been pre-concentrated by the tank (see Nuts & Bolts article October 2000 – Solids Filtration).
The PR Aqua Swirl Separator is a proven technology that is effective at removing aquaculture waste solids (e.g. uneaten feed and fish feces) over a range of hydraulic loading rates. Where lower hydraulic loading rates are acceptable, PR Aqua Radial Flow Settlers may also be considered for improved solids removal efficiency.
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How It Works
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Swirl separators concentrate solids based on the “Tea Cup Effect”. Culture tank effluent is introduced into the unit tangentially, creating rotational flow. As the swirling flow rises towards the outlet located near the top of the vessel, solids separate towards the center where velocities are lower, and eventually accumulate in the conical bottom. The clear water leaves the vessel by the overflow weir and the accumulated solids are periodically flushed from the bottom of the cone.
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