Primary reason is high ...

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Primary reason is high concentration of incoming solids. If the sludge removal is not able to match the removal of separated solids then the unit goes solids critical and results in carry over of floc. However at some places Lamella and Tube Settlers are adopted for conventional process too. It is observed that short length settlers (Tubes with length of 600 mm and 60 degree inclination) do not have much problem with biomass growth.