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Consider the following statements regarding waste stabilization ponds: 1. The pond has a symbiotic process of waste stabilization through algae on one hand and bacteria on the other 2. The oxygen in the pond is provided by algae through photosynthesis 3. The detention period is of the order of two to three days 4. The bacteria which develop in the pond are aerobic Which of the above statements are correct?

Consider the following statements regarding waste stabilization ponds: 1. The pond has a symbiotic process of waste stabilization through algae on one hand and bacteria on the other 2. The oxygen in the pond is provided by algae through photosynthesis 3. The detention period is of the order of two to three days 4. The bacteria which develop in the pond are aerobic Which of the above statements are correct? Correct Answer 1 and 2 only

Explanation: 

Wastewater stabilization ponds

Definition
  • This is a large man-made water body in which wastewater is treated by using a naturally occurring process such as micro-organisms, and algae.

Functions
  • B.O.D removal of wastewater.
  • Dissolve organic material in water
  • Breakdown biodegradable organic material

working
  • They are built up to a depth of 1 to 1.5 m.
  • Photosynthetic algae produce oxygen in the water and consume the carbon dioxide produced by bacteria, thus algae and bacteria carry on the symbiotic process of waste stabilization.
  • The bacteria which develops in the pond is anaerobic.
  • The detention time is 10 to 20 days.

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