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Environmental Engineering Test 4
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  • Question 1/8
    1 / -0
    The correct arrangement of lakes based on the increasing level of productivity is
  • Question 2/8
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    Match the List – I (Parameter in treated effluent) with the List - II (Maximum permissible limit of disposal into inland surface water) and select the appropriate option.

    List – I

    List – II

    A. Total dissolved solids

    1. 30

    B. Total suspended solids

    2. 2100

    C. BOD

    3. 10

    D. Oil & Grease

    4. 100

  • Question 3/8
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    1 L of the mixed liquor is allowed to settle in a graduated cylinder of 1 L and the volume of settled sludge is obtained as 200 ml. The sludge volume index of the given sample considering the mixed liquor suspended solids is 2000 mg/L
  • Question 4/8
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    A large stream has a reoxygenation constant of 0.45 per day and at a point at which organic pollutant is discharged, it is saturated with oxygen at 12 mg/L (Do = 0). Below the outfall, the ultimate demand for oxygen is found to be 19 mg/l and the Deoxygenation Constant is 0.2 per day. Calculate, the D.O at 36 km downstream Assume velocity of stream to be 1.2 m/s.
  • Question 5/8
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    For a colony of 10000 persons having sewage flow rate 250 lpcd with a BOD of 320 mg/l and organic loading of 200 Kg/day/ha, the area of the oxidation pond required for treating the sewage of the colony is _______
  • Question 6/8
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    A sludge digestion tank is used to treat a sludge flow of 40000 liters of sludge per day. The percentage of digested sludge is 30 percent of the incoming sludge daily. If the digestion period is 8 days, calculate the capacity of the sludge digestion tank assuming the parabolic change in the volume instead of linear.
  • Question 7/8
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    The river water having a discharge of 200 ℓ/s and BODU of 20 mg/ℓ enters a community where a sewage discharge having BODU of 400 mg/ℓ raises the BODU of the complete mix to 70 mg/ℓ. The dilution ratio from the discharge of the said sewage is ______ (in decimal up to 2 places)
  • Question 8/8
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    The diameter of a standard rate trickling filter having a depth of 2 m to treat a wastewater discharge of 150 m3/day with an influent BOD5 of 180 mg/ℓ with an efficiency of 90% is (in m up to 2 decimal places)
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