Environment & Ecology · Environmental Engineering

In wastewater treatment terminology, sewage is classified as 'stale' or 'septic' when which condition occurs?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1The concentration of suspended solids exceeds 1000 mg/l
2The dissolved oxygen content is completely depleted or falls below a critical minimal value✓
3The pH level of the effluent drops below 4.5 due to acid discharge
4The temperature of the sewage increases above 40 degrees Celsius

Correct answer

The dissolved oxygen content is completely depleted or falls below a critical minimal value

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