Ch.13 Wastewater story

Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?

• Cholera

• Typhoid

• Asthma

• Dysentery

Sewage treatment

• is a process of waste water treatment.

• refers to waste water that is released by homes, industries, hospitals etc.

• refers to the rain water that run down the streets during heavy rains.

• All of the above

In the treatment of waste water, following steps are involved. (i) aeration (ii) removal of large objects (iii) chlorination The correct order of these steps is

• (i),(iii),(ii)

• (iii), (ii), (i)

• (i), (ii), (iii)

• (ii), (i), (iii)

Dried _____ is used as manure

• slury

• sewage

• sand

• sludge

In vermi-processing toilet the human excreta is treated by

• Redworm

• Tapeworm

• Earthworm

• Roundworm

Pick from the following one chemical used to disinfect water .

• Chlorine

• SIlica

• Washing soda

• Coal

The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as

• Sewers

• Sewerage

• Transport system

• Treatment plan

In a filtration, plant water is filtered using layers of

• sand and clay

• clay and fine gravel

• sand and fine gravel

• sand, fine gravel and medium gravel

Which plant is suggested for purification of sewage pond water ?

• Waste water plant

• Eucalyptus plant

• Urena plant

• None of these

large objects like rugs, napkins, plastic bags are removed by using ?

• bar screens

• sludge

• aeration