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Effect of methods of preparation on distribution of heavy metals in different size fractions of municipal solid waste composts

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Title Effect of methods of preparation on distribution of heavy metals in different size fractions of municipal solid waste composts
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Creator J K Saha
N Panwar
M Vassanda Coumar
 
Subject Solid waste compost
Composting methods
Size fractions
Heavy metals
Extractability
 
Description Not Available
The present study compares the distribution and nature of heavy metals in composts from 12 cities of India, prepared from different types of processed urban solid wastes, namely mixed wastes (MWC), partially segregated wastes (PSWC), and segregated bio-wastes (BWC). Compost samples were physically fractionated by wet sieving, followed by extraction of heavy metals by dilute HCl and NaOH. Bigger particles (>0.5 mm) constituted the major fraction in all three types of composts and had a relatively lower concentration of organic matter and heavy metals, the effect being more pronounced in MWC and PSWC in which a significant portion of the heavy metals was distributed in finer size fractions. Cd, Ni, Pb, and Zn were extracted to a greater extent by acid than by alkali, the difference being greater in MWC, which contained a higher amount of mineral matter. In contrast, Cu and Cr were extracted to a greater extent by dilute alkali, particularly from BWC containing a higher amount of organic matter. Water-soluble heavy metals were generally related to the water-soluble C or total C content as well as to pH, rather than to their total contents. This study concludes that wet sieving with dilute acid can effectively reduce heavy metal load in MWC and PSWC.
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Date 2021-08-02T07:20:06Z
2021-08-02T07:20:06Z
2013-01-01
 
Type Journal
 
Identifier Saha, J.K.; Panwar, N.; Vassanda Coumar, M. (2013) Effect of methods of preparation on distribution of heavy metals in different size fractions of municipal solid waste composts. Environmental Monitoring and Assessment 185: 8815-8821.
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http://krishi.icar.gov.in/jspui/handle/123456789/52040
 
Language English
 
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Publisher Not Available