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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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Most Helpful Customer Reviews
8 of 8 people found the following review helpful:
1.0 out of 5 stars
This book is the exact same thing as "Env Eng Solved Problems" so do yourself a favor and buy it instead of this book.,
By Jay Squared (St. Louis, MO United States) - See all my reviews
This review is from: 101 Solved Environmental Engineering Problems (Paperback)
This book is the exact same thing as "Environmental Engineering Solved Problems" only it is older. Buy "Env Eng Solved Problems" by Schneiter, 2006, Professional Publications Inc, instead of wasting your money on this old edition with a different name. ISBN 978-1-59126-071-4.
4.0 out of 5 stars
Thorough review and handy reference in the exam,
By
This review is from: 101 Solved Environmental Engineering Problems (Paperback)
I found this to be a very good review and also used it as a reference during the exam - had a few problems very similar to those in this book. I passed!
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