The sludge thickening system is designed to achieve flocculation with a minimal amount of expensive chemicals. The floc tank has tangential inlet and outlet openings to maximize flocculation by reducing shear from turbulence. This design creates a gentle swirl that combines the sludge with the polymer. This swirling motion also increases the overall sludge detention time for floc development. A specially designed impeller maintains the swirl without breaking down the flocs.
Dewatering takes place along a multi-zone drum cylinder. The zones can have different-sized mesh media to augment capture efficiency as the sludge moves along the length of the cylinder. Finer mesh is generally used in the feed end where the material is thinner, while downstream zones have larger openings to enhance water removal. Rings with adjustable ports control detention time in each zone. The result is to capture efficiencies as high as 98% without sacrificing high inlet flow rates. High capture efficiency alone can substantially reduce polymer usage.
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