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.
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
A scraper in waste water treatment plant
Removes contaminants
Removes oil and grease
Removes carbondioxide and methane
Removes organic materials
The process by which air is blown into the sewage in aeration tanks during secondary treatment is called:
Aeration
Oxidation
Digestion
Screening
Grit removal is a stage of:
Tertiary treatment of waste water
Secondary treatment of waste water
Primary treatment of waste water
Quaternary treatment of waste water
Disease which spread through stagnant water of a blocked drainage
Malaria
Heart attack
Cancer
Diabetes
The sewage pipes are made up of
PVC
Aluminium
Cast iron
Plastics
The solid waste that settles down at the bottom of sedimentation tanks during the primary treatment of sewage is called:
Scum
Contaminants
Pollutant
Sludge
Which of these acts on clarified water in an aeration tank
Aerobic bacteria
Anaerobic bacteria
Photosynthetic bacteria
Both a and b
The suspended impurities dissolved in waste water
Contaminanants
Drainage
Storm sewage
