The process of passing waste water through a sand or grit chamber to allow the setting of sand, grit, stones and broken glass is called:
Sand removal
Stone settling
Grit removal
Sedimentation
Substances which bring about undesirable change are called:
Pollutants
Pollution
Toxicants
Poison
Sludge is used to obtain
Co2
O2
Methane
Nitrogen
Which of the following is not a water-borne disease?
Cholera
Typhoid
Amoebiasis
Polio
Disease which spread through stagnant water of a blocked drainage
Malaria
Heart attack
Cancer
Diabetes
Cooking oil should not be disposed in kitchen sinks since they
Cause foul smell
Block pipes when they harden
Cause water borne disease
Pollute the soil
Dry sludge is used as
Fuel
Pesticide
Manure
Detergent
A scraper in waste water treatment plant
Removes contaminants
Removes oil and grease
Removes carbondioxide and methane
Removes organic materials
Organic matter discharged into water bodies uses up which of the following from the water?
Oxygen
Carbondioxide
The solid waste that settles down at the bottom of sedimentation tanks during the primary treatment of sewage is called:
Scum
Contaminants
Pollutant
Sludge