Available Answers

1. 1.

   What role can you play in having safe and hygienic sewage disposal system?

2. 2.

   Check point:

   1. The disease which is not caused due to improper disposal sewage is
      1. Typhoid
      2. Jaundice
      3. Cholera
      4. Heart attack
   2. This is not a part of wastewater treatment plant.
      1. Clarifier
      2. Vertical bars
      3. Septic tank
      4. All of them
   3. The solid matter produced during sewage treatment plant is
      1. Sludge
      2. Slurry
      3. Fertilizer
      4. Humus
   4. This plant absorbs all surplus water.
      1. Neem
      2. Peepal
      3. Ashoka
      4. Eucalyptus
3. 3.

   True-False:

   1. Domestic wastewater does not contain microorganisms.
   2. The first step in the treatment of wastewater is to pass the wastewater through grit tank.
   3. Aeration tank contains aerobic bacteria.
   4. Contaminated water is suitable to drink.
   5. We should not throw cooking oil and paints in the sink.
   6. Septic tank is used in cities.
   7. After proper sewage treatment, wastewater can be used for agriculture purposes.
4. 4.

   Fill in the blanks:

   1. Substances that pollute water are called _____________.
   2. The organic impurities present in sewage include _____________ and _____________.
   3. The site where wastewater is treated before it is discharged back to the rivers or lakes is called _____________.
   4. Cleaning of water is a process of removing _____________.
   5. Dried _____________ is used as manure.
   6. Wastewater released by houses is called _____________.
5. 5.

   Give one word answer for the following:

   1. Network of big and small pipes around our homes.
   2. Dirty water containing garbage and human waste.
   3. A water borne disease.
   4. Tanks that collect sludge.
   5. A very good fuel obtained by decomposing sludge.
6. 6.

   What is sewage?