Journal
BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY
Volume 17, Issue -, Pages 93-103Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bcab.2018.11.008
Keywords
Bioaccumulation; Biosorption; Kinetic models; Mercury; Phototrophic bacteria; Shrimp cultivation
Categories
Funding
- Thailand Research Fund through the Royal Golden Jubilee (RGJ) [PHD/0165/2552]
- Graduate School, Prince of Songkla University, Thailand
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This study aimed to investigate the possibility to remove mercury (Hg) using the live or dead biomass of Hg resistant purple nonsulfur bacteria (PNSB) for their potential application to clean up shrimp ponds and during cultivation. The efficiency of Hg2+ removal by three PNSB strains; Rhodovulum sulfidophilum SRW1-5, and Afifella marina strains SSS2-1 and SSW15-1, grown with 2 different growth conditions (microaerobic light and aerobic dark conditions) were tested (2 mg/L HgCl2, 4.5 mg dry cell weight/mL, 30 min). It was found that the efficiency to remove Hg2+ by the dead cells of all strains was significantly higher than for live cells; and the most effective strain was SSS2-1. The highest Hg2+ removal under the optimum conditions using a 4 mg/L initial HgCl2 concentration by live and dead cells grown with both incubation conditions were approximately 87% and 95%, respectively. Under both incubation conditions, Hg2+ biosoption by strain SSS2-1 fitted the Freundlich model for live cells and the Langmuir model for dead cells. The kinetics of Hg2+ biosorption by both cell types of strain SSS2-1 suggests the process as a pseudo-second order kinetic model. This study demonstrates that biomass of the strain SSS2-1 has great potential for its biosorption to remove Hg2+ from contaminated areas like shrimp ponds.
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