Effect of season of application on the adhesion, retention and recontamination of herbage by potentially toxic metals and sewage sludge

The Science of the Total Environment
J P HillmanJ M Wilkinson

Abstract

Grassland in the United Kingdom can accept sewage sludge when, as a result of cropping restrictions, arable land cannot. However, one of the uncertainties associated with the application of sewage sludge to grassland is the potential exposure of the grazing ruminant to sewage sludge particulates adhered to the grass or deposited on the soil surface. The implications of elevated levels of sludge particulates and associated potentially toxic metals (PTMs) are the potential accumulation of PTMs into edible tissues of the grazing animal. Two experiments were performed to investigate the effect of season of application on the adhesion, retention and recontamination of herbage by sewage sludge and PTMs. In each experiment, three treatments were installed, an untreated control, application of sludge in the autumn and application of sludge in the spring. Sewage sludge particulates and PTMs were eluted sequentially 21 days after the application of sludge using water and detergent and the residual (tissue) concentrations were monitored. Total concentrations in each fraction and adhesion indices were calculated. Soil samples taken from the sward treatments after each application showed no elevated concentrations of PTMs or concentrations ...Continue Reading

References

Sep 1, 1991·The Science of the Total Environment·N A Beresford, B J Howard
Jun 1, 1983·The Science of the Total Environment·I Thornton, P Abrahams
May 2, 1994·The Science of the Total Environment·B RaffertyP A Colgan
May 2, 1994·The Science of the Total Environment·B RaffertyP A Colgan

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