Removal of organics from different types of landfill leachate by ozonation

The objective of this investigation was determination of feasibility of ozonation for treatment of leachates from municipal landfill. Efficiency of ozonation was determined for two leachates, different in age, composition and toxicity. We have studied the impact of ozonation time on removal of organ...

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Bibliographic Details
Published in:Water science and technology 2009-01, Vol.60 (3), p.597-603
Main Authors: Zgajnar Gotvajn, A, Derco, J, Tisler, T, Cotman, M, Zagorc-Koncan, J
Format: Article
Language:English
Subjects:
Activated sludge
Acute toxicity
Ammonium
Bacteria
Cities
Daphnia magna
Detoxification
Freshwater crustaceans
Kinetics
Landfill
Landfills
Leachates
Municipal solid waste
Nitrogen compounds
Organic Chemicals - isolation & purification
Oxidation
Oxygen - isolation & purification
Ozonation
Ozone - chemistry
Reaction kinetics
Toxicity
Vibrio fischeri
Waste disposal sites
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - toxicity
Water Purification
Waterborne diseases
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Summary:The objective of this investigation was determination of feasibility of ozonation for treatment of leachates from municipal landfill. Efficiency of ozonation was determined for two leachates, different in age, composition and toxicity. We have studied the impact of ozonation time on removal of organics. The efficiency of treatment was monitored by COD, BOD(5) and DOC analyses, removal of nitrogen compounds, as well as changes in toxicity. Therefore, acute toxicity tests with luminiscent bacteria Vibrio fischeri, Daphnia magna and nitrifying organisms of activated sludge (ammonium oxidation) were performed prior and after ozonation experiments. It has been confirmed that longer time of ozonation does not bring significantly better results regarding treatment of young leachate (36% in 20 minutes, 42% in 120 minutes). Two steps kinetics observed resulted in minor detoxification regarding luminiscent bacteria and no changes in effects to daphnids. More effective was ozonation of the stabilized leachate. Removal of COD reached 50% in 80 minutes and 65% in 120 minutes. Detoxification was also observed. Presented research confirmed, that ozonation itself was not effective treatment methods for investigated types of leachates for reduction of their hazardous impacts to meet regulatory effluent limits.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2009.400