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The leaching of chemical compounds (NNO3, NNH4, Norg, PpO4 and Ptot) and trace elements (Cd, Cu, Cr, Ni, Zn, and Pb) from sewage sludge and their migration through the soil profile is the subject of this study. The column experiments were carried out under atmospheric conditions corresponding to naturally occurring storm events - sewage sludge amended soil was irrigated with high rates of water....
Analyses of the activity of soil enzymes provide information on the biochemical processes occurring in the soil. A pot experiment was undertaken to examine the effect of dairy plant sewage sludge with and without the addition of lignite ash on the activities of protease, urease and dehydrogenases as well as on the pH of grey-brown podzolic soil. The study demonstrated significant differences between...
The aim of the work was the evaluation of the ability of individual PAHs from the US EPA list to migrate in relation to the sludge dose applied. On the basis of statistical analysis, an attempt was undertaken to evaluate the role of organic matter (total content of organic carbon) in the transportation of individual PAHs. Different doses of sewage sludge were introduced into the soil starting with...
The goal of this study was to compare the influence of various doses of sewage sludge and cattle manure on the changes of properties of humic substances in Cambisols developed from silty clay. After organic fertilisation, we observed an increase in total organic carbon in all objects fertilised with sewage sludge and cattle manure. Sewage sludge fertilisation influenced changes of the fractional composition...
Until now, there are considerable differences in opinions of both wide public and experts as far as the application of sewage sludge is concerned, especially due to fears concerning their potential contamination with various noxious substances, heavy metals and phytopathogenous germs. Sludge is usually a mixture of mineral and organic sediments, which are trapped during the process of municipal wastewater...
An effective method for determining polycyclic aromatic hydrocarbons in soils fertilised with sewage sludge is presented in this paper. PAH extraction was carried out by ultrasound; dichloromethane was used as a solvent. Purification was done by means of solid phase extraction. Identification and determination was carried out by means of HPLC with a UV detector. The present analyses were carried out...
Three adsorption equations were applied to verify the influence of correction values (CV) on adsorption parameters calculated using Langmuir, Freundlich and Gunary isotherms. It was found that the inclusion or not of the correction values into the -Langmuir equation did not yield appreciable differences either for amax or b parameters in the case of soils with relatively high organic matter content,...
Soils and ground waters have been extensively exposed to pollution by heavy metals from various anthropogenic sources. The presence of these metals in soils poses a significant environmental hazard, and one of most difficult contamination problems to solve. Description of some sorption and migration phenomena involving Pb, Zn, Ni and Cu in the surface layer of soil and sewage sludge compost was the...
Studies performed in a field indicate that podzolic soil combined with sewage sludge under Salix viminalis L. cultivation exhibited an increase in lipolytic bacteria and fungi numbers as well as a clear stimulation of lipase activity at level A. These changes increased in accordance with the increase of sludge concentration in the soil, and remained in the second and the third year of the experiment...
The influence of crumbled sewage sludge on the biological properties of podzolic soil was studied under laboratory conditions during a five-month period. It was found that when compared to only slightly crumbled sludge, soil mixed with two different concentrations of crumbled sludge (1% and 10%) of a 0.5-mm particle diameter exhibited an increase in the numbers of all tested bacteria groups (total,...
Sugar-beet washing earth (1), ash from a straw combustion furnace (2), and a mixture of both those waste products (3) were added once to pots with light soil. Subsequently, lime stabilised sewage sludge from a treatment plant in Zamość, was added in the amounts equal to 2 and 5% of the soil weight. The control "0" contained no sludge. On those substrata, maize was grown in a three-year monoculture...
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