The percentage ratio of the oxygen available in sewage to the oxygen required to satisfy one stage of bio-chemical oxygen demand (B.O.D.) is termed as

Related MCQs

• The amount of oxygen required for the biological decomposition of dissovled organic solids to occur under aerobic conditions is called bio-chemical oxygen demand (B.O.D.)
• When the sewage is to be distributed over a level area surrounded by dykes (i.e. trenches), the mothod of sewage used is called
• 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
• The amount of oxygen consumed by sewage from an oxidising agent like potassium dichromate is termd as
• Bio-chemical oxygen demand (B.O.D.) of safe drinking water must be
• The minimum dissolved oxygen required in water to save the aquatic life is
• Land disposal of sewage will be favourable where
• Grit chambers are used to remove sand and other organic matter from sewage.
• The activated sludge process of sewage treatment
• In secondary treatment of sewage, the operation which takes place is