Abstract
Biosolids from the WWTP of Thessaloniki were examined for the leaching of phosphorus (as \( {\text{PO}}^{{3 - }}_{4} - {\text{P}} \)), nitrogen (as \( {\text{NH}}^{ + }_{4} - {\text{N}} \) and \( {\text{NO}}^{ - }_{3} - {\text{N}} \)), 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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Batziaka, V., Fytianos, K. & Voudrias, E. Leaching of nitrogen, phosphorus, TOC and COD from the biosolids of the municipal wastewater treatment plant of Thessaloniki. Environ Monit Assess 140, 331–338 (2008). https://doi.org/10.1007/s10661-007-9871-3
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DOI: https://doi.org/10.1007/s10661-007-9871-3