Caterpillar manufactures equipment intended to handle toxic sludge, to dump it in landfills and to
spread it on agricultural land.
An important advantage, says Pirt, is that the minerals become concentrated in the residual solids, enabling extraction of heavy metals such as cadmium and mercury, which could pose environmental problems in sludge
spread on agricultural land.
Not exact matches
In Ontario, Canada, they get a lot of sewage sludge out of the treatment plants; 120,000 tonnes are
spread on 37,000 acres of
agricultural land.
An unlikely alliance has emerged in some regions, especially in New South Wales and Queensland, between environmentalists and traditionally hostile farmers to oppose the rapid
spread of huge new coal mines
on rich
agricultural land and coal seam gas reserves being accessed by fracking.
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