Physics · Environmental Engineering
What is the formula used to determine the relative stability (S) of treated sewage effluent, where t20 is the time in days required for a sample to decolorize a standard volume of methylene blue solution at 20°C?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1S = 100 [1 − 0.116t20]
- 2S = 100 [1 − 0.794t20]✓
- 3S = 100 [1 − 0.543t20]
- 4S = 100 [1 − 0.630t20]
Correct answer
S = 100 [1 − 0.794t20]
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