Ozonation and thermal pre-treatment of municipal sewage sludge – Implications for toxicity and methane potential

A. Davidsson, Eva Eriksson, J. Fick, J. La Cour Jansen

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

The aim of this study was to determine the effects on the methane potential and the overall sludge quality from two different sludge pre-treatment technologies (ozonation high/low dosage and thermal treatment 55/70 °C). In general both treatments gave an increased methane potential. The thermal treatment resulted in higher chemical oxygen demand (COD)-solubilisation, while the highest volatile fatty acids (VFA) increase was obtained with ozonation. The sludges had inhibiting effects in a barley seed germination assay and a yeast oestrogen screen both before and after pre-treatment, but the inhibition was reduced by ozone treatment and digestion. No statistical significant reduction in concentrations of the included pharmaceuticals could be seen.
Original languageEnglish
Publication date2012
Number of pages8
Publication statusPublished - 2012
Event3rd European Conference on Sludge Management - Leon, Spain
Duration: 6 Sep 20127 Sep 2012
Conference number: 3
http://www.ecsm2012.org/

Conference

Conference3rd European Conference on Sludge Management
Number3
CountrySpain
CityLeon
Period06/09/201207/09/2012
Internet address

Keywords

  • Sludge
  • Pre-treatment
  • Thermal
  • Ozone
  • Biogas
  • Toxicity
  • Inhibition
  • Pharmaceuticals

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