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Conversion of Large Scale Wastes into Value-added Products
book

Conversion of Large Scale Wastes into Value-added Products

by Justin S.J. Hargreaves, Ian D. Pulford, Malini Balakrishnan, Vidya S. Batra
December 2013
Intermediate to advanced content levelIntermediate to advanced
174 pages
6h 16m
English
CRC Press
Content preview from Conversion of Large Scale Wastes into Value-added Products
11Introduction
Traditionally, manures and slurries have been recycled to soil (Chambers etal.,
2001). More recently, sewage sludge, the waste product of sewage treatment plants,
has also been used, although there are some concerns regarding the content of heavy
metals or other toxins in some sludges (Smith, 1996). The main aim of adding such
wastes to soil is to utilize their nutrient content, especially nitrogen, phosphorus, and
potassium. The amount of nutrient varies depending on the source and type of waste,
but typical contents are 1 to 2% N, 0.5 to 1% P, and 0.5 to 1.0% K. The potassium
tends to be immediately available for plant use, but the nitrogen and phosphorus
are released more slowly by microbial action. The organic nature of ...
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Publisher Resources

ISBN: 9781466512610