Abstract
Abstract This paper presents the results of studies which aim was to determine the pollution of the water environment for both methods of preparation for the utilization of sewage sludge in agriculture. The study was conducted in 2008-2012 in lysimeters filled with light sandy soil (clayey sand). During the study variants with equal doses of nitrogen in an amount of 20 g . m-2 (15.7 g per one lysimeter) were supplied to the soil in sewage sludge and in the compost made from the same sludge. These variants were used three times for two species of perennial plants: Miscanthus gigantenus i Sida hermaphrodita Rusby. In a variant of sludge soil fertilizing, it was leached into water environment more than 12% of the applied nitrogen over 5 years of research. In case of compost nitrogen leaching was reduced to 8.1-10.0% of the quantity supplied to the soil.
Highlights
Sludge produced in municipal wastewater treatment plants are noxious and hazardous waste to the water environment
Compost prepared from the sewage sludge and waste plant contained about 2 times less nitrogen 21.9–28,4 mg · g–1· DM and less organic matter
The differences in the volume of leachate from the soil fertilized with sewage sludge and compost, it is significant, have been statistically confirmed only in the variant of the Sida hermaphrodita Rusby species
Summary
Sludge produced in municipal wastewater treatment plants are noxious and hazardous waste to the water environment. Application of sewage sludge to fertilize the soil, regardless of their previous treatment creates hazard of penetration of some components (especially nitrogen) into the water environment. The amount of nitrogen leaching into the water environment depends among others on the form of the fertilizer used and the size of the dose. The pace and products of these changes are dependent on climatic and soil conditions (air, water and pH)[19] This gives a reason to believe that especially nitrogen contamination of water environment will vary. It will depend on whether the sewage sludge or compost produced out of it is provided to the soil. There are no data in the literature on the results of comparative studies carried out in the same conditions, using both forms of sludge and their impact on the water environment and soil
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