Composting of organic solid wastes is a feasible option but compost resulting from the process is a time consuming process and low in nutritive value. Asuitable alternative technology for the management of solid organic waste from industrial as well as municipal origin can be done through vermicomposting as the end product results a decrease in heavy metal concentrations as compared to conventional compost. However from past research studies,like other types of compost, often have a highertotal metal concentration than the original contaminated feedstock. Earthworms can be viewed as a means of extracting metals from contaminated organic solid wastes in a manner equivalent to phyto (metal) extraction. Conservative and pragmatic limits on heavy metals in compost may be set that encourage contaminantreduction
measures and the recycling of composted residuals on
the one hand, while also protecting soil from the potentially deleterious
effects of long-term heavy metal accumulation on the other
(Smith, 2009). Nevertheless,the metal dynamics during vermicomposting
is complex, matrix dependent and metal-specific, which is
indicated by the evident inconsistencies in the literature concerning
the modulating effects of vermicomposting on metal mobilities
and obviously warrants further studies with arrays of metal speciation
tools.
Composting of organic solid wastes is a feasible option but compost resulting from the process is a time consuming process and low in nutritive value. Asuitable alternative technology for the management of solid organic waste from industrial as well as municipal origin can be done through vermicomposting as the end product results a decrease in heavy metal concentrations as compared to conventional compost. However from past research studies,like other types of compost, often have a highertotal metal concentration than the original contaminated feedstock. Earthworms can be viewed as a means of extracting metals from contaminated organic solid wastes in a manner equivalent to phyto (metal) extraction. Conservative and pragmatic limits on heavy metals in compost may be set that encourage contaminantreductionmeasures and the recycling of composted residuals onthe one hand, while also protecting soil from the potentially deleteriouseffects of long-term heavy metal accumulation on the other(Smith, 2009). Nevertheless,the metal dynamics during vermicompostingis complex, matrix dependent and metal-specific, which isindicated by the evident inconsistencies in the literature concerningthe modulating effects of vermicomposting on metal mobilitiesand obviously warrants further studies with arrays of metal speciationtools.
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