The process of removing all large objects from the raw sewage before they damage or clog the pipes of primary treatment is called:
Grit removal
Screening
Sedimentation
Digestion
Which of the disease is caused by improper disposal of sewage
Cancer
Cholera
Measles
Smallpox
In a waste water treatment plant when water is passed through screens of vertical bars --------------------- are removed.
Plastic bags, cans, sticks etc
Faeces, food waste, soap etc
Sand, dilt, gravel, etc
Tea leaves, food waste, sanitary napkins etc
Name the disposal method in which solid organic wastes are subjected to combustion so as to convert them into residue and gaseous products:
Combustion
Incineration
Distillation
Oxidation
Which of the following is not a water-borne disease?
Typhoid
Amoebiasis
Polio
Which of the following statements is false?
Sludge is rich in organic matter and hence can improve the physical condition of the soil.
Sludge can be used as food.
Sludge can be used as landfill.
Sludge can be used to produce biogas.
Organic matter discharged into water bodies uses up which of the following from the water?
Oxygen
Carbondioxide
Methane
Nitrogen
Substances which bring about undesirable change are called:
Pollutants
Pollution
Toxicants
Poison
Stagnant water in blocked drain is a good breeding place for
Mosquitoes and fishes
Flies and fishes
Mosquitoes and flies
Earthworms and fishes
Grit chambers of a sewage disposing plant remove
faeces,food ,waste, soap, etc
Sand, dirt, gravel, etc
Tea leaves, food waste, sanitary products
