Leaching of nitrogen, phosphorus, TOC and COD from the biosolids of the municipal wastewater treatment plant of Thessaloniki |
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Authors: | V Batziaka K Fytianos E Voudrias |
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Institution: | (1) Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece;(2) Department of Environmental Engineering, Democritus University of Thrace, 671 00 Xanthi, Greece |
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Abstract: | Biosolids from the WWTP of Thessaloniki were examined for the leaching of phosphorus (as ), nitrogen (as and ), and organic matter (as TOC and COD), using two tests: (1) a pH static leaching test and (2) a characterization test, relating
contaminant release to the liquid to solid (L/S) ratio. Moreover, a Microtox toxicity test was conducted, to examine the pH
dependency of the toxicity of the sludge leachate on the Vibrio fischeri bacterium. Maximum phosphorus release was observed at pH < 3 and at pH > 10. Ammonium nitrogen exhibited maximum leachability
at near neutral pH conditions, while nitrate nitrogen exhibited a mild increase in the leachate, as the leachant pH increased
from 2 to 12. Both TOC and COD exhibited an increase in the leachate concentration, as the leachant pH was increased from
2 to 12. Ecotoxicological analysis showed that maximum toxicity occurred at very low and very high pH-conditions. As liquid-to-solid
ratio increased, the leachate concentration (in mg/l) of all parameters studied decreased. The results of the study were used
to conduct a release assessment estimate for the case of Thessaloniki. |
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Keywords: | Leaching tests Biosolids Sewage sludge Nutrients TOC COD Toxicity |
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