Grit chambers of a sewage plant are usually changed after

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• Grit chambers are used to remove sand and other organic matter from sewage.
• Grit should be removed from sewage before
• When the sewage is to be distributed over a level area surrounded by dykes (i.e. trenches), the mothod of sewage used is called
• Land disposal of sewage will be favourable where
• The activated sludge process of sewage treatment
• The natural process in which the oxygen of water of streams is consumed by sewage and at the same time, it is replenished (filled again) by the atmosphere, is known as
• In secondary treatment of sewage, the operation which takes place is
• A sewer which receives storm water, surface run-off and sewage is called a
• The amount of oxygen consumed by sewage from an oxidising agent like potassium dichromate is termd as
• In preliminary treatment of sewage, the operation which takes place, is