Publication: Impacts of wastewater sludge amendments in restoring nitrogen cycle in p-nitrophenol contaminated soil
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Şağban, F. Olcay Topaç
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Science Press
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Abstract
The possible impacts on nitrogen-cycle in a p-nitrophenol (PNP) polluted soil and the effectiveness of wastewater sludge amendments in restoring nitrification potential and urease activity were evaluated by an incubation study. The results indicated that PNP at 250 mg/kg soil inhibited urease activity, nitrification potential, arginine ammonification rate and heterotrophic bacteria counts to some extents. After exposure to PNP, the nitrification potential of the tested soil was dramatically reduced to zero over a period of 30 days. Based on the findings, nitrification potential was postulated as a simple biochemical indicator for PNP pollution in soils. Nitrogen-cycling processes in soils responded positively to the applications of wastewater sludges. A sludge application rate of 200 tons/ha was sufficient for successful biostimulation of these nitrogen processes. The microbial activities in sludge-amended, heavy PNP-polluted soils seemed to recover after 30-45 days, indicating the effectiveness of sludge as a useful soil amendment.
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Keywords
Environmental sciences & ecology, P-nitrophenol, Wastewater sludge, Soil pollution, Nitrogen-cycle, Biostimulation, Polycyclic aromatic-hydrocarbons, Phenolic-compounds, Metabolic-activities, Diesel oil, Degradation, Biodegradation, Mineralization, Nitrification, Toxicity, Irrigation, Amino acids, Denitrification, Hydrolases, Nitrification, Nitrogen, Oxidation, Soils, Wastewater, Application rates, Biochemical indicators, Biostimulation, Contaminated soils, Cycling process, Heterotrophic bacterias, Incubation study, Microbial activities, Nitrogen cycles, P-nitrophenol, Polluted soils, Soil amendment, Urease activity, Wastewater sludge, Soil pollution, Ammonification, Contaminated land, Microbial activity, Nitrification, Nitrogen cycle, Phenolic compound, Reaction kinetics, Sludge, Soil amendment, Soil pollution, Soil remediation, Wastewater
Citation
Sağban, F. O. T. vd. (2011). "Impacts of wastewater sludge amendments in restoring nitrogen cycle in p-nitrophenol contaminated soil". Journal of Environmental Sciences, 23(4), 616-623.