Sedimentation Tank and Filtration : A Definitive Guide
Compressed air scour during back washing for four minutes; Soaking of sand in water and caustic soda and agitation by air. Cracking of Filter. The fine sand in top layer, shrink and form shrinkage cracks in bed, near wall junctions. ... Perforated pipes are installed at bottom of settling tanks and compressed air is blown through them. The ...
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