4.3 Article

Comparative Analysis on Metal Removal Potential of Exopolymeric Substances with Live and Dead Cells of Bacteria

出版社

SPRINGER INT PUBL AG
DOI: 10.1007/s41742-021-00386-2

关键词

Bacteria; Biosorption; Exopolymeric substances; Multi-metal solutions; Wastewater treatment

资金

  1. Malaysian Ministry of Education (MOE) under the FRGS grant scheme [FRGS/1/2018/STG03/MUSM/02/1]

向作者/读者索取更多资源

This study investigated and compared the metal removal efficacy of exopolymeric substances (EPS), live and dead cells of different bacteria. It was found that dead cells of Gram-positive bacteria showed better metal removal potential compared to live cells, while the opposite was observed for Gram-negative bacteria. Among the bacterial isolates, the EPS of B. cereus demonstrated the most effective biosorption of metals. EPS has the potential for metal removal, although the amount of metal removed is lower than levels removed by live and dead cells. Multi-metal systems showed lower metal removal compared to single-metal systems.
This study investigated and compared the metal removal efficacy of exopolymeric substances (EPS), live and dead cells of Bacillus cereus, Staphylococcus aureus, Stenotrophomonas maltophilia and Pseudomonas fluorescens. Results revealed that dead cells of Gram-positive bacteria (B. cereus, S. aureus) showed better metal removal potential compared to live cells, while the contrary was observed for Gram-negative bacteria (S. maltophilia, P. fluorescens). The EPS from all bacterial isolates demonstrated the least efficacy in metal removal potential (9-30%) compared to live (12-63%) and dead (16-70%) cells. Comparing among bacterial isolates, the EPS of B. cereus was the most effective in biosorbing all metals (Cu: 27.94%, Pb: 34.29%, Zn: 23.15%, Cd: 14.65%, Cr: 26.15%). These were, however, lower than the amount of metals removed by live (Cu: 44.82%, Pb: 53.64%, Zn: 39.13%, Cd: 19.85%, Cr: 38.75%) and dead (Cu: 63.26%, Pb: 70.16%, Zn: 58.86%, Cd: 57.68%, Cr: 56.48%) cells of B. cereus. Fourier-transform infrared spectroscopy (FTIR) analysis suggests that the hydroxyl groups in EPS were primarily involved in metal biosorption. Mean metal removal in multi-metal systems (31.75 +/- 13.21%) were significantly inferior compared to single-metal systems (36.21 +/- 13.24%). This study revealed that EPS has the potential for metal removal although the amount of metal removed is lower than levels removed by live and dead cells. EPS remains an interesting alternative as the use of this non-toxic biomolecule is safer compared to live and dead cells. EPS can be further improved upon via cultivation methods or pre-treatment, to establish their feasible use for wastewater treatment.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.3
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据