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7 September, 09:12

A landfill in Minnesota receives an average of 50 cm of rainfall per year. Sixty percent of the water runs off the landfill. The landfill has a surface area of 5000 m2. The leachate from the landfill is treated for cadmium and other toxic metals. The present leachate collection system is 80% efficient.

What is the volume (in m3) of leachate that is treated per year?

A. 1600

B. 1000

C. 960

D. 800

E. 200

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Answers (1)
  1. 7 September, 11:00
    0
    option D.

    Explanation:

    given,

    Average rainfall in Minnesota = 50 cm / year

    area of the landfill = 5000 m²

    60% of the water runs off the landfill.

    efficiency of leachate collection = 80%

    volume of leachate treated per year = ?

    volume of rainfall in a year

    = 0.5 x 5000

    = 2500 m³

    Volume of water infiltrated

    = 40 % of volume of rainfall

    = 0.4 x 2500

    = 1000 m³

    Volume of leachate per year

    = 80 % of 1000

    = 0.8 x 1000

    = 800 m³

    The correct answer is option D.
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