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A wastewater stream in a city with flow rate 200 m3/s, discharges at a point into a river, which is fully saturated with oxygen and flowing at a rate of 2800 m3/s during the lean period with velocity of 25 cm/s. It was estimated that the critical deficit will occur at a location of 30 km downstream of the river from the point where wastewater starts mixing into river water. If the 5 days BOD of the wastewater at 30°C temperature is 350 mg/l and considering the temperature of the mix to be 20°C, then the critical oxygen deficit (in mg/L) will be _______. It is given that kD and kR at 20°C are 0.10 per day and 0.2 per day respectively.
    Correct answer is between '13.7,14'. Can you explain this answer?
    Verified Answer
    A wastewater stream in a city with flow rate 200 m3/s, discharges at a...
    Concept:
    The critical oxygen deficit, Dc
    Where. kD = Deoxygenation constant
    KR = Reoxygenation constant
    L0 = ultimate BOD
    tc = critical time after when critical oxygen deficit occurs.
    Solution:
    Deoxygenation constant
    = 0.10 (1.047)10
    = 0.158 per day
    Reoxygenation constant
    = 0.20 (1.016)10
    = 0.234 per day
    Critical time = 
    = 1.389 days
    5-day BOD = 350 mg/l of wastewater
    5 – day BOD of the mixture of wastewater stream and river water is given by
    = 23.33 mg/l.
    BODs at 20°C = L0 (1 – (10)-kD × 5)
    23.33 = L0 (1 – (10)-0.10 × 5)
    ⇒ L0 = 34.12 mg/l
    ∴ Critical oxygen deficit
    DC = 13.89 mg/l
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    A wastewater stream in a city with flow rate 200 m3/s, discharges at a point into a river, which is fully saturated with oxygen and flowing at a rate of 2800 m3/s during the lean period with velocity of 25 cm/s. It was estimated that the critical deficit will occur at a location of 30 km downstream of the river from the point where wastewater starts mixing into river water. If the 5 days BOD of the wastewater at 30°C temperature is 350 mg/l and considering the temperature of the mix to be 20°C, then the critical oxygen deficit (in mg/L) will be _______. It is given that kDand kRat 20°C are 0.10 per day and 0.2 per day respectively.Correct answer is between '13.7,14'. Can you explain this answer?
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    A wastewater stream in a city with flow rate 200 m3/s, discharges at a point into a river, which is fully saturated with oxygen and flowing at a rate of 2800 m3/s during the lean period with velocity of 25 cm/s. It was estimated that the critical deficit will occur at a location of 30 km downstream of the river from the point where wastewater starts mixing into river water. If the 5 days BOD of the wastewater at 30°C temperature is 350 mg/l and considering the temperature of the mix to be 20°C, then the critical oxygen deficit (in mg/L) will be _______. It is given that kDand kRat 20°C are 0.10 per day and 0.2 per day respectively.Correct answer is between '13.7,14'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A wastewater stream in a city with flow rate 200 m3/s, discharges at a point into a river, which is fully saturated with oxygen and flowing at a rate of 2800 m3/s during the lean period with velocity of 25 cm/s. It was estimated that the critical deficit will occur at a location of 30 km downstream of the river from the point where wastewater starts mixing into river water. If the 5 days BOD of the wastewater at 30°C temperature is 350 mg/l and considering the temperature of the mix to be 20°C, then the critical oxygen deficit (in mg/L) will be _______. It is given that kDand kRat 20°C are 0.10 per day and 0.2 per day respectively.Correct answer is between '13.7,14'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A wastewater stream in a city with flow rate 200 m3/s, discharges at a point into a river, which is fully saturated with oxygen and flowing at a rate of 2800 m3/s during the lean period with velocity of 25 cm/s. It was estimated that the critical deficit will occur at a location of 30 km downstream of the river from the point where wastewater starts mixing into river water. If the 5 days BOD of the wastewater at 30°C temperature is 350 mg/l and considering the temperature of the mix to be 20°C, then the critical oxygen deficit (in mg/L) will be _______. It is given that kDand kRat 20°C are 0.10 per day and 0.2 per day respectively.Correct answer is between '13.7,14'. Can you explain this answer?.
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