GATE CE 2025 Set 1 — Question 45
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Environmental Engineering → Wastewater Treatment Processes → Oxidation Ponds
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Question
A facultative pond system is employed for wastewater treatment. Which of the following statements is/are true:
Correct answer
(A) The dissolved oxygen concentration will be high during daytime compared to night-time; (B) The pH will be high during daytime compared to night-time
Solution
In a facultative pond:
1.Daytime: Algae perform photosynthesis, consuming and producing . This increases the dissolved oxygen (DO) concentration. The consumption of shifts the carbonate equilibrium, reducing acidity and increasing the pH. Thus, statements (A) and (B) are true.
2.Night-time: Photosynthesis stops, but respiration continues, consuming and producing . This leads to a decrease in DO and a decrease in pH.
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