Effect of live and inactivated Chlamydomonas reinhardtii on the removal of tetracycline in aquatic environments. (December 2022)

• Record Type: Journal Article
• Authors: Han, Kai; Liu, Yanjun; Hu, Jianan; Jia, Junjie; Sun, Shujuan
• Is Part Of: Chemosphere. Volume 309:Part 2(2022)
• Publication Date: 2022-12
• Subjects: Microalgae -- Tetracycline -- Biosorption -- Photodegradation -- Wastewater treatment; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.136666
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: With the development of medical drugs, the widely used tetracycline has brought many adverse effects on the ecosystem and human health. Tetracycline pollution of water environment is becoming more and more serious, and has become an emerging environmental problem. As single celled organisms, microalgae are not only model organisms for risk assessment of aquatic ecosystems, but also can efficiently purify sewage. Microalgae-mediated pollutant remediation has attracted more and more attention from researchers. In this paper, Chlamydomonas reinhardtii ( C. reinhardtii ) was used to remove tetracycline in aqueous solution, and the removal efficiency and mechanism of microalgae on tetracycline were studied. The results showed that the removal rates of tetracycline by active and inactivated microalgae at a density of 5 × 10 6 cells·mL −1 were 81.9% and 89.8%, respectively. C. reinhardtii removed tetracycline through biosorption and nonmetabolic processes. Microalgal cell supernatant and hydroxyl radicals could significantly promote the removal of tetracycline. The positively charged tetracycline was electrostatically adsorbed on the microalgae surface and extracellular polymeric substances. Microalgae biomass can promote the production of ROS and enhance the ability of microalgae to remove tetracycline. Graphical abstract: Image 1 Highlights: Both live and inactived Chlamydomonas reinhardtii are reliable microalgaes for tetracycline removal. Inactivated Chlamydomonas reinhardtii could maintain excellent tetracycline removal ability. Under light conditions, the removal effect of inactivated microalgae was better than that of live microalgae. Microalgal cell supernatant and hydroxyl radicals could promote the tetracycline removal.