ES 101- Physical Treatment-wastewater

Turbidity of water is an indication of the presence of

• 1. Suspended inorganic matter

• 1. Dissolved solids

• 1. Floating solids

• Dissolved gases

The function of skimming tank in sewage treatment is to remove ______
substances.

• Dissolved solids

• Suspended solid

• Oil and fatty

• Gritty and inorganic

In water treatment, alum [Al2(SO4)] is used for the process of

• Filtration

• Coagulation

• Sedimentation

• Disinfection

Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by

1. 

• 1. Biological oxygen pond

• 1. Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)

• 1. Lagoons

• 1. Filtration

Which is the most practical and economical method for removal of suspended solid matter from polluted water?

• 1. Sedimentation

• 1. Skimming off

• 1. Chlorination

• 1. Biological oxidation

Presence of _______ hardness in water.

hardness is responsible for the temporary

• Carbonate

• Calcium

• Choride

• Sulphate

Pick out the one which is not a chemical coagulant.

• 1. Aluminium sulphate

  2. 

• 1. Ferrous sulphate

• Hydrated lime

• Chloramine