The Cr(VI) bioremediation potential of Chlamydomonas debaryana

Show simple item record Roestorff, Maria M. Mbonambi, Nondumiso C. Chirwa, Evans M.N. 2020-04-27T13:13:53Z 2020-04-27T13:13:53Z 2019
dc.description.abstract Chromium (Cr) is an essential industrial component and has many applications in industrial manufacturing. Anthropogenic activities can lead to the release of hexavalent chromium [Cr(VI)] as well as trivalent chromium [Cr(III)]. Cr(VI) is 1,000 times more toxic than Cr(III), and very detrimental to most organisms even at low concentrations. Chlamydomonas debaryana, a freshwater algae, appeared to be Cr(VI) resistant and was able to survive in Cr(VI) concentrations of up to 80 mg/L for an extended period in packed aquifer media columns. This micro-green algae strain was isolated alongside Cr(VI) reducing bacteria (CRB) at a Cr(VI) contaminated site in South Africa. In this study, the growth response of C. debaryana in the presence of Cr(VI) was compared to that of Chlamydomonas reinhardtii, to assess the Cr(VI) tolerance of C. debaryana. At 50 mg/L Cr(VI) concentration the maximum chlorophyll a increase was 25.3 % for C. debaryana and 34.2 % for C. reinhardtii. However, after 3.5 d the chlorophyll a content decreased only 38.1 % for C. debaryana compared to a 100% decrease for C. reinhardtii. Indicating that C. debaryana is only slightly more resistant than C. reinhardtii. Zero Cr(VI) removal was observed with the algae: C. debaryana could not reduce Cr(VI) to Cr(III) or adsorb Cr(VI) anions from the solution. C. debaryana as well as C. reinhardtii, algae cells are inhibited when directly exposed to Cr(VI) in continuously mixed batch reactors. C. debaryana might be better suited to use in cooperation with CRB for Cr(VI) treatment in a biofilm reactor. This research can lead to an improved treatment set up for Cr(VI) pollution that requires fewer chemical and energy inputs and produces less secondary waste. en_ZA
dc.description.department Chemical Engineering en_ZA
dc.description.librarian am2020 en_ZA
dc.description.sponsorship The National Research Foundation of South Africa en_ZA
dc.description.uri en_ZA
dc.description.uri en_ZA
dc.identifier.citation Roestorff M.M., Mbonambi N.C., Chirwa E.M.N., 2019, The Cr(VI) Bioremediation Potential of Chlamydomonas Debaryana, Chemical Engineering Transactions, 76, 1303-1308 DOI:10.3303/CET1976218. en_ZA
dc.identifier.issn 2283-9216 (online)
dc.identifier.other 10.3303/CET1976218
dc.language.iso en en_ZA
dc.publisher The Italian Association of Chemical Engineering en_ZA
dc.rights © 2019, AIDIC Servizi S.r.l. en_ZA
dc.subject Industrial manufacturing en_ZA
dc.subject Hexavalent chromium en_ZA
dc.subject Chlamydomonas reinhardtii en_ZA
dc.subject Chromium (Cr) en_ZA
dc.title The Cr(VI) bioremediation potential of Chlamydomonas debaryana en_ZA
dc.type Article en_ZA

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