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GATE Civil Engineering (CE) 2020 Shift 1 Solved Paper

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Question : 20

Total: 65

A river has a flow of 1000 million litres per day (MLD). BOD 5 of 5mg/ litre and Dissolved Oxygen (DO) level of 8mg/ litre before receiving the wastewater discharge at a location. For the existing environmental conditions, the saturation DO level is 10mg/ litre in the river. Wastewater discharge of 100MLD with the BODs of 200mg/ litre and DO level of 2mg/ litre falls at that location. Assuming complete mixing of wastewater and river water, the immediate DO deficit (in mg/litre, round off to two decimal places), is

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