Effect of nutrients on the biodegradation of tributyltin (TBT) by alginate immobilized microalga, Chlorella vulgaris, in natural river water

• Published in: Journal of hazardous materials 2011-01, Vol.185 (2), p.1582-1586
• Main Authors: Jin, Jing, Yang, Lihua, Chan, Sidney M.N., Luan, Tiangang, Li, Yan, Tam, Nora F.Y.
• Format: Article
• Language: English
• Subjects: Abundance; Alginates; Alginates - metabolism; Applied sciences; Beads; Biodegradation; Biodegradation, Environmental; Biological and physicochemical phenomena; cell proliferation; Chlorella vulgaris; Chlorella vulgaris - metabolism; Contamination; Continental surface waters; Degradation; dibutyltin; Exact sciences and technology; Fresh Water; Freshwater; Glucuronic Acid - metabolism; Hazardous materials; Hexuronic Acids - metabolism; microalgae; monobutyltin; Natural water pollution; Nutrients; Pollution; River water; Rivers; Solid Phase Microextraction; Trialkyltin Compounds - metabolism; Tributyltin; water pollution; Water treatment and pollution
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2010.09.075

The removal and degradation of tributyltin (TBT) by alginate immobilized Chlorella vulgaris has been evidenced in our previously published work. The present study was further to investigate the effect of spiked nutrient concentrations on the TBT removal capacity and degradation in the same alginate immobilized C. vulgaris. During the 14-d experiment, compared to the control (natural river water), the spiked nutrient groups (50% or 100% nutrients of the commercial Bristol medium as the reference, marked as 1/2N or 1N) showed more rapid cell proliferation of microalgae and higher TBT removal rate. Moreover, significantly more TBT was adsorbed onto the alginate matrix, but less TBT was taken up by the algal cells of the nutrient groups than that of the control. Mass balance data showed that TBT was lost as inorganic tin in the highest degree in 1N group, followed by 1/2N group and the least was in the control, but the relative abundance of the intermediate products of debutylation (dibutyltin and monobutyltin) were comparable among three groups. In conclusion, the addition of nutrients in contaminated water stimulated the growth and physiological activity of C. vulgaris immobilized in alginate beads and improved its TBT degradation efficiency.