Ecotoxicological characterization of waste waters and activated sludge using biochemical and histopathological biomarkers

Babić, Sanja (2016) Ecotoxicological characterization of waste waters and activated sludge using biochemical and histopathological biomarkers. Doctoral thesis, Faculty of Science > Department of Biology.

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Abstract

Large amounts of sewage effluents and sludges produced by municipal wastewater treatment plant (WWTP) ultimately result in discharge of treated byproducts in receiving freshwaters, marine or soil environments. WWTP’s byproducts often contain various organic, inorganic and microbiological contaminants, which could be accumulated in soil, sediment, crops, and transferred to the food chain on different trophic levels, having consequences also on human health. Despite the fact that sewage effluents and sludges are very complex mixtures, national and international legislation provide recommendations for monitoring of only few selected contaminants and are based mostly on chemical composition. Regarding to the fact that potential toxicity and bioavailability can only be determined using various bioindicators, the research described within this thesis has focussed on a broader ecological approach, providing a comprehensive and clearer insight into the possibility of terrestrial and aquatic ecosystems contamination. Presented thesis consists of a series of studies on wastewater, activated and dehydrated sludges, using two model organisms - zebrafish Danio rerio embryos and earthworm Eisenia fetida. In assessing the toxicity, several biochemical and histopathological biomarkers at various levels of biological organisation (sub-cellular, cellular and tissue level) were conduced. By integrating different biological endpoints within two test organisms, this thesis not only provides determination of efficiency of WWTP Virovitica, but also implements a basis for wastewater and sewage sludge pollution control.

Item Type: Thesis (Doctoral thesis)
Keywords: waste water, activated sludge, earthworm, E. fetida, zebrafish embryo, D. rerio, toxicity tests
Supervisor: Sauerborn Klobučar, Roberta and Pavlica, Mirjana
Date: 2016
Number of Pages: 152
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 28 Sep 2016 11:28
Last Modified: 28 Sep 2016 11:28
URI: http://digre.pmf.unizg.hr/id/eprint/5122

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