Mercury Pollution and Bioremediation—A Case Study on Biosorption by a Mercury-Resistant Marine Bacterium

J, De; Dash, Hirak Ranjan; Das, Surajit

doi:10.1016/b978-0-12-800021-2.00006-6

Cited by 25 publications

(16 citation statements)

References 128 publications

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“…Previous studies reported that areas contaminated with mercury were identified to contain mercury-resistant bacteria [2,4,5,[8][9][10]. Mercury-resistant bacteria are bacteria that can mediate the enzymatic reduction process from toxic mercury to volatile mercury [2,11]. If these bacteria can adapt to environments with high levels of heavy metal contamination, then the use of these bacteria is very effective in increasing the reduction of heavy metals.…”

Section: Introductionmentioning

confidence: 99%

“…is bacterium reduced the phenyl mercury levels in the media to 74.99% within 24 hours of incubation. With this process, mercury-resistant bacteria can be used as bioremediation agents for mercury, even more convincing and potential than other conventional contemporary remediation [11]. For this reason, bacterial communities in mercury-polluted locations need to be studied to understand the diversity of bacteria that have the potential as mercury bioremediation agents.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Bacterial Community Structure and Diversity in Traditional Gold Mining Waste Disposal Site and Rice Field by Using a Metabarcoding Approach

Fatimawali

Kepel

Gani

et al. 2020

International Journal of Microbiology

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Traditional small-scale gold mining mostly use mercury to extract the gold from ores. However, mercury contamination in the environment can affect the composition and structure of the bacterial community. The purpose of this study was to determine the effect of mercury contamination on the bacterial community in the traditional gold mining waste disposal site and in the rice field. Mercury analysis was carried out using the CVAFS method. Analysis of bacterial communities and structure was carried out based on the results of metabarcoding of the V3-V4 16S rRNA regions obtained from paired-end Illumina MiSeq reads. The results showed that the sample from the mining waste disposal site had a mercury level of 230 mg/kg, while the sample from the rice field had 3.98 mg/kg. The results showed that there were differences in microbial composition and community structure in both locations. With the total reads of 57,031, the most dominant phylum was Firmicutes in the mining disposal site sample. Meanwhile, with the total reads of 33,080, the sample from rice field was dominated by Planctomycetes. The abundant classes of bacteria in the mining waste disposal site, from the highest were Bacilli, Gammaproteobacteria and Planctomycetia, while the sample from the rice field was dominated by the Planctomycetia and Acidobacteria subdivision 6. The families that dominated the sample in disposal site were Bacillaceae and Aeromonadaceae, while the sample from the rice field was dominated by Gemmataceae. The abundant genera in both locations were Bacillus and Gemmata. This study concluded that the high level of mercury in the soil reduced the richness and diversity of bacterial phyla and lower taxa. There was also a shift in the dominance of phyla and lower taxa in both locations. This study provides an understanding of the microbial community structure in the area that is highly contaminated with mercury to open insight into the potential of these bacteria for mercury bioremediation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Bacterial Community Structure and Diversity in Traditional Gold Mining Waste Disposal Site and Rice Field by Using a Metabarcoding Approach

Fatimawali

Kepel

Gani

et al. 2020

International Journal of Microbiology

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“…Previous studies highlight a range of microorganisms that have mer operon and able to reduce Hg 2+ to elemental Hg (Yu et al, 2014). Some bacteria have resistance to mercury by synthesizing thiol compounds which then react with the mercury and reduce its effect (Wagner-Dobler, 2013;Dea et al, 2014). Another mechanism is having a permeability barrier where the mercury access to the cell is reduced (Das and Dash, 2013).…”

Section: Introductionmentioning

confidence: 98%

“…MerC and MerF code for the membrane proteins and the other parts of the Mer operon are coding for auto regulated genes as MerR and MerD, however MerG is the only one that codes for phenylmercury resistance (Reniero et al, 1998). Depending on the gene varieties, the bacteria can be classified as broad-spectrum resistant (with MerB) or narrowspectrum resistant (Dea et al, 2014). Also these varieties can be different depending on the bacteria if it is gram positive or gram negative, with gram negative possesses more resistance to mercury (Abou-Shanab et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…This operon can be functional for seven different genes (merA, merB, merC, merD, merF, merT and merP) (Das and Dash, 2013). The Mer genes are located on the plasmid, transposons and integrons (Dea et al, 2014). Transposons is part of the DNA which can change its location, also known as jumping DNA, it is being carried on the plasmid itself.…”

Section: Introductionmentioning

confidence: 99%

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Detoxification of mercury pollutant leached from spent fluorescent lamps using bacterial strains

2016

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Heavy metals bioremediation and water softening using ureolytic strains Metschnikowia pulcherrima and Raoultella planticola

Eltarahony

Kamal

Zaki

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: The recalcitrant nature of lead (Pb) and mercury (Hg) to degradation represents a real risk to living creatures and their surrounding ecosystems. Therefore, this study employed ureolytic fungal strain Metschnikowia pulcherrima (29A) and bacterial strain Raoultella planticola (VIP) in their removal using the promising CaCO 3 bioprecipitation technique, for the first time.RESULTS: Out of 50 isolates, strains 29A and VIP were selected based on their highest ureolytic activity, followed by minimum inhibitory concentration assay using 350 ppm of Pb 2+ and Hg 2+ . Throughout 7 days of incubation at 30°C and 150 rpm with 10 8 CFU mL −1 inoculum, the maximum urease activity was 884 and 639 U mL −1 for 29A and VIP at 24 and 30 h of incubation, respectively. Complete removal of Pb 2+ was achieved at 42 h (29A) and 90 h (VIP), while Hg 2+ was totally removed at 60 h (29A) and 102 h (VIP). Remarkable removal of Ca 2+ (>95%) was achieved by the end of the experiments, which would address the hardness problem in water treatment processes. Further, energy-dispersive X-ray analysis (EDX), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the remediated precipitates. EDX profiles showed characteristic peaks of C, O and Ca besides Pb and Hg. SEM illustrated the presence of microbial imprints and calcinated cells in the remediated bioliths. However, XRD confirmed transformation of soluble metals to insoluble forms entrapped in calcite or vaterite lattice.CONCLUSIONS: Such a bioremediation approach ensures the detoxification and sequestration of heavy metals in stable and durable matrices, hindering their leaching from carbonate complex trap to the environment.

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Mercury Pollution and Bioremediation—A Case Study on Biosorption by a Mercury-Resistant Marine Bacterium

Cited by 25 publications

References 128 publications

Comparison of Bacterial Community Structure and Diversity in Traditional Gold Mining Waste Disposal Site and Rice Field by Using a Metabarcoding Approach

Comparison of Bacterial Community Structure and Diversity in Traditional Gold Mining Waste Disposal Site and Rice Field by Using a Metabarcoding Approach

Detoxification of mercury pollutant leached from spent fluorescent lamps using bacterial strains

Heavy metals bioremediation and water softening using ureolytic strains Metschnikowia pulcherrima and Raoultella planticola

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