Bioremoval of heavy metals by bacterial biomass

Aryal, Mahendra; Liakopoulou-Kyriakides, M.

doi:10.1007/s10661-014-4173-z

Cited by 117 publications

(37 citation statements)

References 138 publications

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“…It was also reported that NaOH stress increases the binding of toxins by bacteria cell surfaces (Aryal & Liakopoulou‐Kyriakides, ; El‐Nezami et al, ). In this study, the mechanism behind the increase in absorption of B[a]p after 1‐hr exposure with NaOH was observed because NaOH can hydrolyze amide and ester carboxyl groups of the bacterial cell wall, as a result, more binding sites were exposed to a certain extent.…”

Section: Resultsmentioning

confidence: 97%

Screening of Bifidobacterium strains to bind with Benzo[a]pyrene under food stress factors and the mechanism of the process

Shoukat

Aslam

Rehman

et al. 2019

J Food Process Preserv

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The ability of Bifidobacterium strains to bind with Benzo[a]pyrene in foods, feeds, digestive tract, and environment can decrease the toxic effects of B[a]p on humans and farm animals. In this study, nine Bifidobacterium strains were tested for their ability to binding with B[a]p. Bifidobacterium lactisBI‐04, HN019, and Bifidobacterium infantisBY12 showed highest binding rate with B[a]p. Moreover, the effect of different food stress factors (acid, detergent, oxidative, alkaline, enzymatic, osmotic, and heat) was also evaluated on the binding rate of B[a]p. Positive correlations were observed for acid, and TCA (Trichloracetic acid) stress, while heat stress showed that the viability of bacteria cells was not significant for binding. The mechanisms behind the effect of each stress factor on binding ability were also discussed. These results revealed the importance of cell technological resistance as different factors could significantly affect the performance of the probiotic strains. Practical applications Benzo[a]pyrene is recognized as one of the most potent carcinogens and found in a wide variety of foods, especially smoked, fried, and roasted foods. Therefore, it is crucial to find a safe method in order to remove B[a]p. Bifidobacterium is the most important lactic acid bacteria found in the human intestine and are well known to have many important nutritional and therapeutic benefits. Bifidobacterium, due to their Generally Recognized as Safe status and use as probiotics, is nonpathogenic and without generating toxic residues, making Bifidobacterium strains feasible to use in detoxification method. In this study, the selected Bifidobacterium strains were found highly efficient in the removal of B[a]p.

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Section: Resultsmentioning

confidence: 97%

Screening of Bifidobacterium strains to bind with Benzo[a]pyrene under food stress factors and the mechanism of the process

Shoukat

Aslam

Rehman

et al. 2019

J Food Process Preserv

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“…Most heavy metals can be passively adsorbed onto anionic functional groups present in external polysaccharides (EPS) and membrane lipids and proteins (Kikuchi and Tanaka, 2012), like peptidoglycan, phospholipids, lipopolysaccharides, teichuronic and teichoic acids and various proteins (Vijayaraghavan and Yun, 2008; Din et al, 2014). The sorption potential of heavy metals depends on pH, biomass loading, equilibrium time, initial metal ion concentration, temperature, and the method of the sorption process applied (Aryal and Liakopoulou-Kyriakides, 2015). Even precious metals like Au can bind onto EPS of bacteria (Colica et al, 2012).…”

Section: Resource Recovery For a Circular Economymentioning

confidence: 99%

Resource Recovery from Wastewater by Biological Technologies: Opportunities, Challenges, and Prospects

et al. 2017

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Limits in resource availability are driving a change in current societal production systems, changing the focus from residues treatment, such as wastewater treatment, toward resource recovery. Biotechnological processes offer an economic and versatile way to concentrate and transform resources from waste/wastewater into valuable products, which is a prerequisite for the technological development of a cradle-to-cradle bio-based economy. This review identifies emerging technologies that enable resource recovery across the wastewater treatment cycle. As such, bioenergy in the form of biohydrogen (by photo and dark fermentation processes) and biogas (during anaerobic digestion processes) have been classic targets, whereby, direct transformation of lipidic biomass into biodiesel also gained attention. This concept is similar to previous biofuel concepts, but more sustainable, as third generation biofuels and other resources can be produced from waste biomass. The production of high value biopolymers (e.g., for bioplastics manufacturing) from organic acids, hydrogen, and methane is another option for carbon recovery. The recovery of carbon and nutrients can be achieved by organic fertilizer production, or single cell protein generation (depending on the source) which may be utilized as feed, feed additives, next generation fertilizers, or even as probiotics. Additionlly, chemical oxidation-reduction and bioelectrochemical systems can recover inorganics or synthesize organic products beyond the natural microbial metabolism. Anticipating the next generation of wastewater treatment plants driven by biological recovery technologies, this review is focused on the generation and re-synthesis of energetic resources and key resources to be recycled as raw materials in a cradle-to-cradle economy concept.

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“…Sometimes, complex synthesis of exchangers is essential [12][13][14][15][16]. These methods have multiple disadvantages, including high cost, low efficiency, and re-contamination due to the generation of toxic matter [17][18][19]. Bacteria are comparatively more effective for toxic metal adsorption, specifically at low concentrations of heavy metals in solutions [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Pb2+ biosorption from aqueous solutions by live and dead biosorbents of the hydrocarbon-degrading strain Rhodococcus sp. HX-2

Cao

Yang

et al. 2020

PLoS ONE

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In this study, the Pb 2+ biosorption potential of live and dead biosorbents of the hydrocarbondegrading strain Rhodococcus sp. HX-2 was analyzed. Optimal biosorption conditions were determined via single factor optimization, which were as follows: temperature, 25˚C; pH, 5.0, and biosorbent dose, 0.75 g L −1. A response surface software (Design Expert 10.0) was used to analyze optimal biosorption conditions. The biosorption data for live and dead biosorbents were suitable for the Freundlich model at a Pb 2+ concentration of 200 mg L −1. At this same concentration, the maximum biosorption capacity was 88.74 mg g −1 (0.428 mmol g −1) for live biosorbents and 125.5 mg g −1 (0.606 mmol g −1) for dead biosorbents. Moreover, in comparison with the pseudo-first-order model, the pseudo-second-order model seemed better to depict the biosorption process. Dead biosorbents seemed to have lower binding strength than live biosorbents, showing a higher desorption capacity at pH 1.0. The order of influence of competitive metal ions on Pb 2+ adsorption was Cu 2+ > Cd 2+ > Ni +. Fourier-transform infrared spectroscopy analyses revealed that several functional groups were involved in the biosorption process of dead biosorbents. Scanning electron microscopy showed that Pb 2+ attached to the surface of dead biosorbents more readily than on the surface of live biosorbents, whereas transmission electron microscopy confirmed the transfer of biosorbed Pb 2+ into the cells in the case of both live and dead biosorbents. It can thus be concluded that dead biosorbents are better than live biosorbents for Pb 2+ biosorption, and they can accordingly be used for wastewater treatment.

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Bioremoval of heavy metals by bacterial biomass

Cited by 117 publications

References 138 publications

Screening of Bifidobacterium strains to bind with Benzo[a]pyrene under food stress factors and the mechanism of the process

Screening of Bifidobacterium strains to bind with Benzo[a]pyrene under food stress factors and the mechanism of the process

Resource Recovery from Wastewater by Biological Technologies: Opportunities, Challenges, and Prospects

Pb2+ biosorption from aqueous solutions by live and dead biosorbents of the hydrocarbon-degrading strain Rhodococcus sp. HX-2

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