The Mixed Waste Batch That Was 5.67%, Not 4.5%
Averaging 8% and 1% gave 4.5%, but the two waste streams had different masses. The correct mixed concentration was 5.67% by mass.
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FE Environmental · Solid Hazardous Waste
FE Solid Hazardous Waste Practice Questions
Solve FE-style Solid Hazardous Waste questions and learn the reasoning behind each answer through interactive engineering cases.
Interactive problems•Reasoning explained•Solutions included
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PRACTICE SET
FE Solid Hazardous Waste Practice Questions
Choose a question and solve it before reading the final engineering verdict.
QUESTION01
The Mixed Waste Batch That Was 5.67%, Not 4.5%
Averaging 8% and 1% gave 4.5%, but the two waste streams had different masses. The correct mixed concentration was 5.67% by mass.
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QUESTION02
The Incinerator That Achieved 99.9%, Not 99%
An outlet of 0.025 kg/hr from a 25 kg/hr hazardous constituent feed means only 0.1% remains. The destruction/removal efficiency is 99.9%.
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QUESTION03
The Landfill That Produced 12,000 m³ of Leachate, Not 22,000
Precipitation minus evapotranspiration was not enough. Runoff and storage change reduced the annual leachate estimate to 12,000 m³.
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QUESTION04
The Landfill That Lasted 3.42 Years, Not 4.11
Ignoring daily cover made the landfill appear to last 4.11 years. Including 20% cover-volume use reduced the life to about 3.42 years.
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What should I practice in FE Solid Hazardous Waste?
Practice the calculations, assumptions, constraints, and failure modes that appear around this topic. Each question here is designed to test whether you can apply the concept when the obvious calculation is not the whole engineering decision.