Adsorption-uptake-metabolism kinetic model on the removal of BDE-47 by a Chlorella isolate. (May 2016)

• Record Type: Journal Article
• Authors: Deng, Dan; Tam, Nora F.Y.
• Is Part Of: Environmental pollution. Volume 212(2016)
• Page Start: 290
• Page End: 298
• Publication Date: 2016-05
• Subjects: PBDEs -- Microalgae -- Adsorption -- Uptake -- Metabolism; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2016.01.063
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Polybrominated diphenyl ethers (PBDEs) are persistent and toxic organic pollutants, causing hazardous to ecosystems and human health but are difficult to remove from contaminated environments. The mechanism and kinetics of a Chlorella isolate to remove BDE-47 were investigated. This species isolated from the influent of wastewater treatment plants in Hong Kong was PBDE tolerant. More than 80% of BDE-47 was removed in short- and long-term experiments lasting 1 h and 7 days, respectively. The dominant removal process was adsorption on cell surfaces, with 73% of the spiked BDE-47 removed within five minutes of exposure. As the exposure prolonged, the adsorption became saturated. BDE-47 on cell surfaces was then gradually taken up into cells. At the end of the 7-day exposure, 17% of the spiked BDE-47 was within cells, while 27% was metabolized. Four metabolites, including BDE-28, 6-OH- and 5-OH-BDE-47, and 6-MeO-BDE-47, were produced from the debromination, hydroxylation and methoxylation of BDE-47. The removal kinetics of BDE-47 by freshwater microalgae could be explained by the multi-compartmental adsorption-uptake-metabolism model developed in this study. Graphical abstract: Highlights: >80% of BDE-47 in contaminated medium was removed by Chlorella isolate. Dominated removal process was adsorption on cell surface. BDE-47 was gradually taken up into the cell and metabolized. Hydroxylated BDEs were major metabolites among four possible metabolites. Adsorption-uptake-metabolism kinetics model was established. Abstract : BDE-47 was mainly removed by Chlorella sp. via adsorption and metabolism.