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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
StatePublished

Conference

Conference3rd European Conference on Sludge Management
Number3
CountrySpain
CityLeon
Period06/09/1207/09/12
Internet addresshttp://www.ecsm2012.org/

Keywords

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