Centrifugation - This method has not been practiced much as it is less efficient in dewatering and is a continuous process. It employs a solid-bowl type centrifuge. Conditioned sludge is fed to the centre of bowl. Rapid rotation of the bowl throws the solid to the outer edge of the bowl. Scraper blades remove the solids deposited on the edge.
In all the above four methods the liquid portion separated from the sludge must be properly disposed. Depending upon the organic content, it may be either disposed directly or sent back to the treatment plant for further stabilization.
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