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Identifier

000397431

Title

Φυκοαποκατάσταση ρυπασμένων υδάτων από βαρέα μέταλλα

Alternative Title

Phycoremediation of heavy metal polluted waters

Author

Μαντζώρου, Αντωνία Α.

Thesis advisor

Περγαντής, Σπυρίδων

Reviewer

Βερβερίδης, Φίλιππος
Απόστολος, Σπύρος

Abstract

Heavy metals are considered to be particularly dangerous pollutants. Their presence in polluted areas (soil or /and water) has brought about environmental concerns since they cause toxicities in the flora and fauna, even at low concentrations. A large variety of different species of microalgae has been examined for their ability to bind and remove these specific pollutants. In the present dissertation, laboratory studies were conducted to determine the effects of different concentrations (0 – 2,0 mM) of Cu, Zn, Ni and As on the green alga Chlamydomonas reinhardtii after its exposure for 72 h in the aforementioned heavy metals. The toxicity of these heavy metals was examined by studying the growth and viability of the cell cultures and by quantitatively estimating changes in chlorophylls a, b and total proteins. The results showed that the Cu and Ni had the greatest adverse effect on the green alga. In a similar manner, Zn and As affected also negatively the selected parameters, but to a lesser extent than the former metals. In some cases, it was observed that the presence of Zn and As showed to increase selected parameters [such as chlorophyll (a+b) and total protein content] in comparison to control cultures. Regarding the removal of Cu from the aqueous solution, the microalga showed ability to bind the metal. The amount of bound Cu through the process of biosorption and bioaccumulation increased over time, reaching the maximum values at the end of the toxic phase. Nevertheless, it was difficult to quantitatively distinguish between biosorpted and bioaccumulated Cu in the cells.

Language

Greek

Subject

Bιορρόφηση

Bιοσυσσώρευση

Chlamydomonas reinhardtii

Tοξικότητα

Βioaccumulation

Βiosorption

Τoxicity

Issue date

2015-11-20