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Question
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 bacteria
Which of the above statements are correct? 
A.
1 and 2 only
B.
2 and 3 only
C.
3 and 4 only
D.
1 and 4 only
Answer ( Option A)

1 and 2 only

Solution

• Stabilization pond has symboisis between algae and bacteria. In which algae produces oxgyen by photosynthesis and bacteria consumes that. 
• Stabilization pond used for domestic sewage are mostly facultative in nature 
• Stabilization pond has detention period around 15 - 30 days

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