Earthworms change the physical
and chemical properties of soil by mixing it with organic material and through their burrowing they
improve aeration and render contaminants available for microorganisms. The presence of earthworms
in contaminated soil indicate that they can survive a wide range of different organic contaminants, such
as pesticides, herbicides, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs),
and crude oil, at least when concentrations of the contaminant are not too high. The improvement of the
soil due to their activity and the microorganisms in their digestive track can contribute to the accelerated
removal of contaminants from soil, but sometimes their casts adsorb the pollutant so that its dissipation
is delayed. There are limits, however, on how earthworms can be used to remediate soil, which will be
discussed in this review.
Earthworms change the physicaland chemical properties of soil by mixing it with organic material and through their burrowing theyimprove aeration and render contaminants available for microorganisms. The presence of earthwormsin contaminated soil indicate that they can survive a wide range of different organic contaminants, suchas pesticides, herbicides, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs),and crude oil, at least when concentrations of the contaminant are not too high. The improvement of thesoil due to their activity and the microorganisms in their digestive track can contribute to the acceleratedremoval of contaminants from soil, but sometimes their casts adsorb the pollutant so that its dissipationis delayed. There are limits, however, on how earthworms can be used to remediate soil, which will bediscussed in this review.
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