This unique collection of 101+ solved problems is geared to help engineers prepare for the Environmental Engineering PE Exam. All problems are written in the current PE exam format (multiple-choice) and cover the full range of subjects on the exam. For each problem, a full step-by-step solution is provided, explaining how to arrive at the anser most efficiently. For Environmental PE candidates, this is an essential book--in preparing for the exam, nothing beats working realistic problems.
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R. Wane Schneiter, PhD, PE, DEE, is Professor of Civil and Environmental Engineering at the Virginia Military Institute and a Diplomate of the American Academy of Environmental Engineers. Among his other publications is "Environmental Engineering Practice PE Exams."
Sample Problem:
Municipal solid waste is being evaluated for composting with thickened waste activated sludge, The city generates 300,000 kg of solid waste daily, 32% of which is compostable. The discarded moisture content of the solid waste is 38%, and the waste C:N ratio is 12:1. The waste activated sludge is thickened to 18% solids, and the C:N ratio of the solids is 90:1.
(1) How much sludge must be mixed with the solid waste to produce a C:N ratio of 30:1?
(A) 22,000 kg/d (B) 29,000 kg/d (C) 220,000 kg/d (D) 290,000 kg/d
(2) If the C:N ratio of 30:1 is satisfied by the sludge, what is the resulting moisture content of the mixture?
(A) 24% (B) 30% (C) 56% (D) 69%
(3) How much water must be added or removed to bring the moisture content of the sludge-solid waste mixture, blended to meet the C:N ratio of 30:1, to 60%?
(A) add 120,000 kg/d (B) add 9,000 kg/d (C) add 13,000 kg/d (D) remove 28,000 kg/d
(4) What classification best describes composting?
(A) mesophilic aerobic (B) mesophylic anaerobic (C) thermophylic aerobic (D) thermophylic anaerobic
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