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Assessment of Landfill Leachate Toxicity Reduction After Biological Treatment

  • Anita Jemec
  • Tatjana Tišler
  • Andreja Žgajnar-Gotvajn
Article

Abstract

In the present article, the efficiency of biological treatment of landfill leachates was evaluated by implementation of physicochemical characterisation and a complex toxicity assessment. An array of toxicity tests using bacterium Vibrio fischeri, alga Desmodesmus subspicatus, crustacean Daphnia magna, and embryo of fish Danio rerio, as well as unconventional methods using biochemical biomarkers (protein content, enzymes cholinesterase, and glutathione-S-transferase), were employed. Toxicity of leachates varied depending on the season of collection in relation to their different physicochemical characteristics. Uncommon effects of leachates on organisms, such as hormetic-like increases of algal growth and reproduction of daphnids, were identified. New approaches using the activities of enzymes were found unsuitable for routine hazard assessment of leachates. Although physicochemical parameters and toxicity decreased significantly after biological treatment, the effluents did not meet the demands of the current Slovenian legislation; thus, the existing biological treatment was found inappropriate. The development of advanced treatment techniques for landfill leachates is thus encouraged.

Keywords

Chemical Oxygen Demand Toxicity Test Biological Treatment Algal Growth Sequence Batch Reactor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors thank Polona Zevnik, Emil Meden, and Tina Bobnar for technical assistance. The authors also gratefully acknowledge the financial support of the Ministry of Education, Science and Technology of the Republic Slovenia through research programs P2-0150 and P2-191.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Anita Jemec
    • 1
  • Tatjana Tišler
    • 1
  • Andreja Žgajnar-Gotvajn
    • 2
  1. 1.Laboratory for Environmental Sciences and EngineeringNational Institute of ChemistryLjubljanaSlovenia
  2. 2.Department of Chemical, Biochemical and Environmental Engineering, Faculty of Chemistry and Chemical TechnologyUniversity of LjubljanaLjubljanaSlovenia

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