Bioremediation approaches for organic pollutants: A critical perspective

Megharaj, Mallavarapu; Ramakrishnan, B.; Venkateswarlu, Kadiyala; Sethunathan, N.; Naidu, Ravi

doi:10.1016/j.envint.2011.06.003

Cited by 788 publications

(329 citation statements)

References 176 publications

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“…These studies improve our understanding on biodegradation mechanisms and on degradation abilities of different strains (Bombach et al, 2010). However, the degradative abilities of these bacteria are often depressed under field conditions (Markiewicz et al, 2011;Megharaj et al, 2011). This is partly attributed to the fact that laboratory studies are performed in artificial media (mostly mineral salts media) with optimized nutrients and culture conditions, high concentrations of bacteria and the absence of competition with indigenous bacterial populations.…”

Section: Introductionmentioning

confidence: 99%

Enhanced and continued degradation of microcystins using microorganisms obtained through natural media

Hong

Pan

2014

Journal of Microbiological Methods

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Microorganisms isolated through artificial media are often unsustainable in biodegrading microcystins (MCs) in natural water. Here we studied alternative approaches to isolate MCs-degrading bacteria using natural media. In comparison to two species (MS-1 and MS-2) isolated from artificial media and the failure of bacterial colonies formation using water extracts of sediment (10%, w/v), five colony species (WC-1 to WC-5) appeared using concentrated water extracts of sediment that is 10-fold enhancement of nutrient level. In the simulated biodegradation test in Lake Taihu water with continuous supply of MCs, a lag phase of 6 days was required for MS-1 and M-2 to degrade 13% and 15% of the added MC-RR and MC-LR, respectively, whereas the lag phase was only 3 days with approximately 44% and 31% removal of the added MC-RR and MC-LR by WC-1 to WC-5. During the continuous supply experiment, degradation of MCs by MS-1 and MS-2 stopped after 3 days, while degradation of MCs by WC-1 to WC-5 lasted continuously throughout the 18 day test period with 2 to 6-fold enhancement of removal rate. 16S rRNA gene sequences and phylogenetic analysis indicated the potential to amplify species of MCsdegrading bacteria when natural media were used. The results suggested that the increased adaptability of bacteria obtained through concentrated natural media was responsible for the enhanced and continued biodegradation under simulated natural water conditions.

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Section: Introductionmentioning

confidence: 99%

Enhanced and continued degradation of microcystins using microorganisms obtained through natural media

Hong

Pan

2014

Journal of Microbiological Methods

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“…Before their introduction biopreparations require recovery to achieve full revival of degradation activity [6,40]. Furthermore, it is not possible to check before buying whether microorganisms contained in the biopreparation are not antagonists to microorganisms naturally present in the treated soil.…”

Section: Application Of Biopreparations and Enzymesmentioning

confidence: 99%

“…Attention should be paid to the use of transgenic Arabidopsis thaliana, with the bacterial gene merH, which is not only more resistant to toxic mercury chloride, but also has the ability to secrete mercury into the atmosphere in the non-toxic form [40]. Moreover, the effect of this group of microorganisms may also consist in the production of various compounds by the bacteria collected by plants (eg vitamins such as biotin, pantothenic acid, niacin, pyridoxine, thiamine), increasing the bioavailability of nutrients contained in the medium or inhibiting the development of pathogens and reducing the collection of compounds that inhibit the growth of the plants (eg ethylene and hydrogen cyanide) [39,40].…”

Section: Application Of Biopreparations and Enzymesmentioning

confidence: 99%

The ways to increase efficiency of soil bioremediation

Wołejko

Wydro

Loboda

2016

Ecological Chemistry and Engineering S

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Abstract:The aim of this paper was to present possibilities of using different substrates to assist the bioremediation of soils contaminated with heavy metals, pesticides and other substances. Today's bioengineering offers many solutions that enable the effective conduct of biological remediation, including both biostimulation and bioaugmentation. For this purpose, they are used to enrich various organic substances, sorbents, microbiological and enzymatic preparations, chemical substances of natural origin or nanoparticles. The use of genetic engineering as a tool to obtain microorganisms and plants capable of efficient degradation of pollutants may cause the risks that entails the introduction of transgenic plants and microorganisms into the environment. In order to determine the efficacy and possible effects of the various bioremediation techniques, it is required to conduct many studies and projects on a larger scale than only in the laboratory. Furthermore, it should be emphasized that bioremediation involves interdisciplinary issues and therefore, there is a need to combine knowledge from different disciplines, such as: microbiology, biochemistry, ecology, environmental engineering and process engineering.

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“…Besides technical challenges relating to in situ efficacy (including survival and competition with indigenous microorganisms), such environmental concerns, and problems with solutions that were able to unequivocally alleviate them (e.g. conditional suicide mechanisms [107] have posed major hurdles to the commercialization of any GEM products for in situ use so far [56]. Upcoming approaches based on systems and synthetic biology could improve the issue of poor in situ efficiency of GEMs [109] and could thus make the release of GEMs for bioremediation applications more attractive.…”

Section: Environmentmentioning

confidence: 99%

“…While decontamination of water or soil by microorganisms (bioremediation) is a process that can occur naturally (intrinsic bioremediation), it may be enhanced by the addition of nutrients (biostimulation), additional microorganisms (bioaugmentation) or by plants (phytoremediation) [56]. .…”

Section: (Ii) Removal Of Environmental Pollution By Genetically Enginmentioning

confidence: 99%

Synthetic Genomics and Synthetic Biology Applications Between Hopes and Concerns

König¹,

Frank²,

Heil³

et al. 2013

Current Genomics

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New organisms and biological systems designed to satisfy human needs are among the aims of synthetic genomics and synthetic biology. Synthetic biology seeks to model and construct biological components, functions and organisms that do not exist in nature or to redesign existing biological systems to perform new functions. Synthetic genomics, on the other hand, encompasses technologies for the generation of chemically-synthesized whole genomes or larger parts of genomes, allowing to simultaneously engineer a myriad of changes to the genetic material of organisms. Engineering complex functions or new organisms in synthetic biology are thus progressively becoming dependent on and converging with synthetic genomics. While applications from both areas have been predicted to offer great benefits by making possible new drugs, renewable chemicals or clean energy, they have also given rise to concerns about new safety, environmental and socio-economic risks -stirring an increasingly polarizing debate. Here we intend to provide an overview on recent progress in biomedical and biotechnological applications of synthetic genomics and synthetic biology as well as on arguments and evidence related to their possible benefits, risks and governance implications.

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Bioremediation approaches for organic pollutants: A critical perspective

Cited by 788 publications

References 176 publications

Enhanced and continued degradation of microcystins using microorganisms obtained through natural media

Enhanced and continued degradation of microcystins using microorganisms obtained through natural media

The ways to increase efficiency of soil bioremediation

Synthetic Genomics and Synthetic Biology Applications Between Hopes and Concerns

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