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Biosorption and biodegradation of tributyltin (TBT) by alginate immobilized Chlorella vulgaris beads in several treatment cycles

Paper ID Volume ID Publish Year Pages File Format Full-Text
36416 45132 2006 6 PDF Available
Title
Biosorption and biodegradation of tributyltin (TBT) by alginate immobilized Chlorella vulgaris beads in several treatment cycles
Abstract

Biosorption and biodegradation by microorganisms to remove tributyltin (TBT), a toxic and persistent contaminant, have attracted more and more interests in recent years but information related to microalgae is still inadequate. The present study aims to investigate the removal and degradation of TBT at 10, 50 and 100 μg Sn l−1 contamination levels by alginate-immobilized Chlorella vulgaris beads during six consecutive cycles (4 days each), and compare the performance with blank alginate beads (without algae). More than 90% of TBT was rapidly removed, within 1 day, by both algal and blank beads, irrespective to the spiked TBT concentrations and the number of cycles, indicating the initial removal was mainly by biosorption and alginate matrix provided many binding sites. For algal beads, TBT was mostly adsorbed onto alginate matrix with some on algal cell walls, and <10% of the spiked TBT accumulated inside cells. The amounts of debutylated products, dibutyltin (DBT) and monobutyltin (MBT) in medium increased gradually with treatment cycles and with the spiked TBT concentrations. At the contamination levels of 50 and 100 μg Sn l−1, both DBT and MBT in algal bead treatments increased to >5 μg Sn in cycle 6 while little DBT and MBT were detected in blank beads throughout the cycles. The accumulation of DBT and MBT, same as TBT, inside cells was relatively small compared to that in medium and alginate matrix. For the high TBT level of 100 μg Sn l−1, 60% of the spiked TBT was biodegraded by algal beads at the end of the six cycles. These results suggested that the alginate immobilized alga, C. vulgaris was able to continuously detoxify TBT into DBT and MBT for six consecutive cycles even at the highest TBT contamination level.

Keywords
Tributyltin; Chlorella vulgaris; Alginate bead; Biodegradtion; Consecutive cycles
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Biosorption and biodegradation of tributyltin (TBT) by alginate immobilized Chlorella vulgaris beads in several treatment cycles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 41, Issue 7, July 2006, Pages 1560–1565
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us