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Nicholls HCG, Rolfe SA, Mallinson HEH, Hjort M, Spence MJ, Bonte M, Thornton SF. Distribution of ETBE-degrading microorganisms and functional capability in groundwater, and implications for characterising aquifer ETBE biodegradation potential. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:1223-1238. [PMID: 34350568 PMCID: PMC8724112 DOI: 10.1007/s11356-021-15606-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 07/19/2021] [Indexed: 06/13/2023]
Abstract
Microbes in aquifers are present suspended in groundwater or attached to the aquifer sediment. Groundwater is often sampled at gasoline ether oxygenate (GEO)-impacted sites to assess the potential biodegradation of organic constituents. However, the distribution of GEO-degrading microorganisms between the groundwater and aquifer sediment must be understood to interpret this potential. In this study, the distribution of ethyl tert-butyl ether (ETBE)-degrading organisms and ETBE biodegradation potential was investigated in laboratory microcosm studies and mixed groundwater-aquifer sediment samples obtained from pumped monitoring wells at ETBE-impacted sites. ETBE biodegradation potential (as determined by quantification of the ethB gene) was detected predominantly in the attached microbial communities and was below detection limit in the groundwater communities. The copy number of ethB genes varied with borehole purge volume at the field sites. Members of the Comamonadaceae and Gammaproteobacteria families were identified as responders for ETBE biodegradation. However, the detection of the ethB gene is a more appropriate function-based indicator of ETBE biodegradation potential than taxonomic analysis of the microbial community. The study shows that a mixed groundwater-aquifer sediment (slurry) sample collected from monitoring wells after minimal purging can be used to assess the aquifer ETBE biodegradation potential at ETBE-release sites using this function-based concept.
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Affiliation(s)
- Henry C G Nicholls
- Groundwater Protection and Restoration Group, Department of Civil and Structural Engineering, University of Sheffield, S1 3JD, Sheffield, UK
| | - Stephen A Rolfe
- Department of Animal and Plant Sciences, Alfred Denny Building, University of Sheffield, S10 2TN, Sheffield, UK
| | - Helen E H Mallinson
- Groundwater Protection and Restoration Group, Department of Civil and Structural Engineering, University of Sheffield, S1 3JD, Sheffield, UK
| | - Markus Hjort
- Concawe, Boulevard du Souverain 165, 1160, Brussels, Belgium
| | - Michael J Spence
- Concawe, Boulevard du Souverain 165, 1160, Brussels, Belgium
- British Geological Survey, Environmental Science Centre, Keyworth, Nottingham, NG12 5GG, UK
| | - Matthijs Bonte
- Concawe, Boulevard du Souverain 165, 1160, Brussels, Belgium
- Shell Global Solutions International B.V., Rijswijk, 2288GK, The Netherlands
- Ministry of Infrastructure and Water Management, The Hague, The Netherlands
| | - Steven F Thornton
- Groundwater Protection and Restoration Group, Department of Civil and Structural Engineering, University of Sheffield, S1 3JD, Sheffield, UK.
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2
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Thornton SF, Nicholls HCG, Rolfe SA, Mallinson HEH, Spence MJ. Biodegradation and fate of ethyl tert-butyl ether (ETBE) in soil and groundwater: A review. JOURNAL OF HAZARDOUS MATERIALS 2020; 391:122046. [PMID: 32145642 DOI: 10.1016/j.jhazmat.2020.122046] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 12/07/2019] [Accepted: 01/07/2020] [Indexed: 06/10/2023]
Abstract
This review summarises the current state of knowledge on the biodegradation and fate of the gasoline ether oxygenate ethyl tert-butyl ether (ETBE) in soil and groundwater. Microorganisms have been identified in soil and groundwater with the ability to degrade ETBE aerobically as a carbon and energy source, or via cometabolism using alkanes as growth substrates. Aerobic biodegradation of ETBE initially occurs via hydroxylation of the ethoxy carbon by a monooxygenase enzyme, with subsequent formation of intermediates which include acetaldehyde, tert-butyl acetate (TBAc), tert-butyl alcohol (TBA), 2-hydroxy-2-methyl-1-propanol (MHP) and 2-hydroxyisobutyric acid (2-HIBA). Slow cell growth and low biomass yields on ETBE are believed to result from the ether structure and slow degradation kinetics, with potential limitations on ETBE metabolism. Genes known to facilitate transformation of ETBE include ethB (within the ethRABCD cluster), encoding a cytochrome P450 monooxygenase, and alkB-encoding alkane hydroxylases. Other genes have been identified in microorganisms but their activity and specificity towards ETBE remains poorly characterised. Microorganisms and pathways supporting anaerobic biodegradation of ETBE have not been identified, although this potential has been demonstrated in limited field and laboratory studies. The presence of co-contaminants (other ether oxygenates, hydrocarbons and organic compounds) in soil and groundwater may limit aerobic biodegradation of ETBE by preferential metabolism and consumption of available dissolved oxygen or enhance ETBE biodegradation through cometabolism. Both ETBE-degrading microorganisms and alkane-oxidising bacteria have been characterised, with potential for use in bioaugmentation and biostimulation of ETBE degradation in groundwater.
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Affiliation(s)
- S F Thornton
- Groundwater Protection and Restoration Group, Dept of Civil and Structural Engineering, University of Sheffield, Sheffield S1 3JD, UK
| | - H C G Nicholls
- Groundwater Protection and Restoration Group, Dept of Civil and Structural Engineering, University of Sheffield, Sheffield S1 3JD, UK
| | - S A Rolfe
- Dept of Animal and Plant Sciences, Alfred Denny Building, University of Sheffield, Sheffield S10 2TN, UK
| | - H E H Mallinson
- Groundwater Protection and Restoration Group, Dept of Civil and Structural Engineering, University of Sheffield, Sheffield S1 3JD, UK
| | - M J Spence
- Concawe, Environmental Science for European Refining, Boulevard du Souverain 165, 1160 Brussels, Belgium
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Nicholls HCG, Mallinson HEH, Rolfe SA, Hjort M, Spence MJ, Thornton SF. Influence of contaminant exposure on the development of aerobic ETBE biodegradation potential in microbial communities from a gasoline-impacted aquifer. JOURNAL OF HAZARDOUS MATERIALS 2020; 388:122022. [PMID: 31962211 DOI: 10.1016/j.jhazmat.2020.122022] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 12/14/2019] [Accepted: 01/02/2020] [Indexed: 06/10/2023]
Abstract
Aerobic biodegradation of ethyl tert butyl ether (ETBE) in a gasoline-impacted aquifer was investigated in laboratory microcosms containing groundwater and aquifer material from ETBE-impacted and non-impacted locations amended with either ETBE, or ETBE plus methyl tert butyl ether (MTBE). As sole substrate, ETBE was biodegraded (maximum rate of 0.54 day-1) without a lag in ETBE-impacted microcosms but with a lag of up to 66 days in non-impacted microcosms (maximum rate of 0.38 day-1). As co-substrate, ETBE was biodegraded preferentially (maximum rate of 0.25 and 0.99 day-1 in non-impacted and impacted microcosms, respectively) before MTBE (maximum rate of 0.24 and 0.36 day-1 in non-impacted and impacted microcosms, respectively). Further addition of ETBE and MTBE reduced lags and increased biodegradation rates. ethB gene copy numbers increased significantly (>100 fold) after exposure to ETBE, while overall cell numbers remained constant, suggesting that ethB-containing microorganisms come to dominate the microbial communities. Deep sequencing of 16S rRNA genes identified members of the Comamonadaceae family that increased in relative abundance upon exposure to ETBE. This study demonstrates the potential for ETBE biodegradation within the unsaturated and saturated zone, and that ETBE biodegrading capability is rapidly developed and maintained within the aquifer microbial community over extended timescales.
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Affiliation(s)
- H C G Nicholls
- Groundwater Protection and Restoration Group, Dept of Civil and Structural Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom
| | - H E H Mallinson
- Groundwater Protection and Restoration Group, Dept of Civil and Structural Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom
| | - S A Rolfe
- Dept of Animal and Plant Sciences, Alfred Denny Building, University of Sheffield, Sheffield S10 2TN, United Kingdom
| | - M Hjort
- Concawe, Environmental Science for European Refining, Boulevard du Souverain 165, 1160 Brussels, Belgium
| | - M J Spence
- Concawe, Environmental Science for European Refining, Boulevard du Souverain 165, 1160 Brussels, Belgium
| | - S F Thornton
- Groundwater Protection and Restoration Group, Dept of Civil and Structural Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom.
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4
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Pongkua W, Dolphen R, Thiravetyan P. Bioremediation of gaseous methyl tert-butyl ether by combination of sulfuric acid modified bagasse activated carbon-bone biochar beads and Acinetobacter indicus screened from petroleum contaminated soil. CHEMOSPHERE 2020; 239:124724. [PMID: 31505447 DOI: 10.1016/j.chemosphere.2019.124724] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 08/28/2019] [Accepted: 08/30/2019] [Indexed: 06/10/2023]
Abstract
Combination of sulfuric acid modified bagasse activated carbon-bone biochar beads and Acinetobacter indicus screened from petroleum contaminated soil was the best condition for gaseous methyl tert-butyl ether (MTBE) removal. It was found that H2SO4 modified bagasse AC in powder form had higher adsorption capacity (989.33 mg g-1) than that in bead form (1.94 mg g-1). In addition, bone biochar in powder form (3.51 mg g-1) also had higher adsorption capacity than that in bead form (1.63 mg g-1). This was the fact that material beads contained high moisture content that inhibited the penetration of gaseous MTBE into the material. And a mixed material of H2SO4 modified bagasse AC-bone biochar beads had the highest adsorption capacity (2.22 mg g-1) compared to individual H2SO4 modified bagasse AC beads (1.94 mg g-1) and bone biochar beads (1.63 mg g-1) due to a mixed material had more rough surface and high surface area on its material. So, gaseous MTBE can penetrate through this material more easily. Although the maximum adsorption capacity of H2SO4 modified bagasse AC in powder form was the highest but microorganism cannot sustain and survive in this form for a long time. Therefore, the material beads were more suitable for microorganism to grow and degrade gaseous MTBE. Microorganism can degrade MTBE and caused no secondary wastes. Moreover, A. indicus was a novel strain for MTBE removal that has not been previously reported. Therefore, a combination of A. indicus-mixed material beads was a good choice for MTBE removal in a biofilter system.
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Affiliation(s)
- Waleeporn Pongkua
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand
| | - Rujira Dolphen
- Pilot Plant Development and Training Institute, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand
| | - Paitip Thiravetyan
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand.
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Berrelleza-Valdez F, Parades-Aguilar J, Peña-Limón CE, Certucha-Barragán MT, Gámez-Meza N, Serrano-Palacios D, Medina-Juárez LA, Calderón K. A novel process of the isolation of nitrifying bacteria and their development in two different natural lab-scale packed-bed bioreactors for trichloroethylene bioremediation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 241:211-218. [PMID: 31004998 DOI: 10.1016/j.jenvman.2019.04.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 03/11/2019] [Accepted: 04/12/2019] [Indexed: 06/09/2023]
Abstract
Trichloroethylene (TCE) is a carcinogenic compound that is commonly present in groundwater and has been detected in drinking water sources for Mexican towns in the Mexico-US border area. Nitrifying bacteria, such as Nitrosomonas europaea, have been shown to be capable of degrading halogenated compounds, including TCE, but it is difficult to obtain high cell concentrations of these bacteria. The aim of the present study was to generate biomass of a nitrifying bacterial consortium from the sludge of an urban wastewater treatment plant (WWTP) and evaluate its capacity to biodegrade TCE in two different natural lab-scaled packed bed bioreactors. The consortium was isolated by a novel method using a continuous stirred-tank bioreactor inoculated with activated sludge from the Domos WWTP located in Cd. Obregón, Sonora, Mexico. The bioreactor was fed with specific media to cultivate ammonia-oxidizing bacteria at a dilution rate near the maximum specific growth rate reported for Nitrosomonas europaea. Optical density and suspended solids measurements were performed to determine the culture biomass production, and the presence of inorganic nitrogen species was determined by spectrophotometry. The presence of nitrifying ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) was confirmed by PCR amplification, and biofilm formation was observed by scanning electron microscopy. Batch-scale experiments confirmed the biodegradative activity of the isolated consortium, which was subsequently fixed in an inorganic carrier as zeolite and a synthetic carrier such as polyurethane to both be used as lab-scale packed-bed bioreactors, with up to 58.63% and 62.7% of TCE biodegradation achieved, respectively, demonstrating a possible alternative for TCE bioremediation in environmental and engineering systems.
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Affiliation(s)
- Fernando Berrelleza-Valdez
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico
| | - Jonathan Parades-Aguilar
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico
| | - Carlos E Peña-Limón
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico.
| | - María Teresa Certucha-Barragán
- Departamento de Ingeniería Química y Metalurgia, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico
| | - Nohemí Gámez-Meza
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico
| | - Denisse Serrano-Palacios
- Departamento de Ciencias del Agua y Medio Ambiente, Instituto Tecnológico de Sonora, Antonio Caso S/N. C.P., 85130, Ciudad Obregón, Sonora, Mexico
| | - Luis Angel Medina-Juárez
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico.
| | - Kadiya Calderón
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico.
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Sowani H, Kulkarni M, Zinjarde S. Harnessing the catabolic versatility of Gordonia species for detoxifying pollutants. Biotechnol Adv 2019; 37:382-402. [DOI: 10.1016/j.biotechadv.2019.02.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 01/12/2019] [Accepted: 02/11/2019] [Indexed: 11/26/2022]
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7
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Wu H, Yan H, Quan Y, Zhao H, Jiang N, Yin C. Recent progress and perspectives in biotrickling filters for VOCs and odorous gases treatment. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 222:409-419. [PMID: 29883876 DOI: 10.1016/j.jenvman.2018.06.001] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 05/19/2018] [Accepted: 06/01/2018] [Indexed: 06/08/2023]
Abstract
Pollution caused by volatile organic compounds (VOCs) and odorous pollutants in the air can produce severe environmental problems. In recent years, the emission control of VOCs and odorous pollutants has become a crucial issue owing to the adverse effect on humans and the environment. For treating these compounds, biotrickling filter (BTF) technology acts as an environment friendly and cost-effective alternative to conventional air pollution control technologies. Besides, low concentration of VOCs and odorous pollutants can also be effectively removed using BTF systems. However, the VOCs and odorants removal performance by BTF may be limited by the hydrophobicity, toxicity, and low bioavailability of these pollutants. To solve these problems, this review summarizes the design, mechanism, and common analytical methods of recent BTF advances. In addition, the operating conditions, mass transfer, packing materials and microorganisms (which are the critical parameters in a BTF system) were evaluated and discussed in view of improving the removal performance of BTFs. Further research on these specific topics, together with the combination of BTF technology with other technologies, should improve the removal performance of BTFs.
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Affiliation(s)
- Hao Wu
- Key Laboratory of Natural Resources of Changbai Mountain and Functional Molecules, Ministry of Education, Department of Chemistry, Yanbian University, Yanji 133002, China
| | - Huayu Yan
- Key Laboratory of Natural Resources of Changbai Mountain and Functional Molecules, Ministry of Education, Department of Chemistry, Yanbian University, Yanji 133002, China
| | - Yue Quan
- Key Laboratory of Natural Resources of Changbai Mountain and Functional Molecules, Ministry of Education, Department of Chemistry, Yanbian University, Yanji 133002, China
| | - Huazhang Zhao
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Nanzhe Jiang
- Key Laboratory of Natural Resources of Changbai Mountain and Functional Molecules, Ministry of Education, Department of Chemistry, Yanbian University, Yanji 133002, China
| | - Chengri Yin
- Key Laboratory of Natural Resources of Changbai Mountain and Functional Molecules, Ministry of Education, Department of Chemistry, Yanbian University, Yanji 133002, China.
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Purswani J, Romero-Zaliz RC, Martín-Platero AM, Guisado IM, González-López J, Pozo C. BSocial: Deciphering Social Behaviors within Mixed Microbial Populations. Front Microbiol 2017; 8:919. [PMID: 28596759 PMCID: PMC5442188 DOI: 10.3389/fmicb.2017.00919] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Accepted: 05/08/2017] [Indexed: 12/01/2022] Open
Abstract
Ecosystem functionality depends on interactions among populations, of the same or different taxa, and these are not just the sum of pairwise interactions. Thus, know-how of the social interactions occurring in mixed-populations are of high interest, however they are commonly unknown due to the limitations posed in tagging each population. The limitations include costs/time in tediously fluorescent tagging, and the number of different fluorescent tags. Tag-free strategies exist, such as high-throughput sequencing, but ultimately both strategies require the use of expensive machinery. Our work appoints social behaviors on individual strains in mixed-populations, offering a web-tool (BSocialhttp://m4m.ugr.es/BSocial.html) for analyzing the community framework. Our quick and cheap approach includes the periodic monitoring of optical density (OD) from a full combinatorial testing of individual strains, where number of generations and growth rate are determined. The BSocial analyses then enable us to determine how the addition/absence of a particular species affects the net productivity of a microbial community and use this to select productive combinations, i.e., designate their social effect on a general community. Positive, neutral, or negative assignations are applied to describe the social behavior within the community by comparing fitness effects of the community against the individual strain. The usefulness of this tool for selection of optimal inoculum in biofilm-based methyl tert-butyl ether (MTBE) bioremediation was demonstrated. The studied model uses seven bacterial strains with diverse MTBE degradation/growth capacities. Full combinatorial testing of seven individual strains (triplicate tests of 127 combinations) were implemented, along with MTBE degradation as the desired function. Sole observation of highest species fitness did not render the best functional outcome, and only when strains with positive and neutral social assignations were mixed (Rhodococcus ruber EE6, Agrobacterium sp. MS2 and Paenibacillus etheri SH7), was this obtained. Furthermore, the use of positive and neutral strains in all its combinations had a significant higher degradation mean (x1.75) than exclusive negative strain combinations. Thus, social microbial processes benefit bioremediation more than negative social microbial combinations. The BSocial webtool is a great contributor to the study of social interactions in bioremediation processes, and may be used in other natural or synthetic habitat studies.
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Affiliation(s)
- Jessica Purswani
- Environmental Microbiology Group, Institute of Water Research, University of GranadaGranada, Spain.,Department of Microbiology, University of GranadaGranada, Spain
| | - Rocío C Romero-Zaliz
- M4Mlab, Department of Computer Science and Artificial Intelligence, University of GranadaGranada, Spain
| | | | - Isabel M Guisado
- Environmental Microbiology Group, Institute of Water Research, University of GranadaGranada, Spain.,Department of Microbiology, University of GranadaGranada, Spain
| | - Jesús González-López
- Environmental Microbiology Group, Institute of Water Research, University of GranadaGranada, Spain.,Department of Microbiology, University of GranadaGranada, Spain
| | - Clementina Pozo
- Environmental Microbiology Group, Institute of Water Research, University of GranadaGranada, Spain.,Department of Microbiology, University of GranadaGranada, Spain
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Guisado IM, Purswani J, Catón-Alcubierre L, González-López J, Pozo C. Toxicity and biofilm-based selection for methyl tert-butyl ether bioremediation technology. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2016; 74:2889-2897. [PMID: 27997398 DOI: 10.2166/wst.2016.461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Extractive membrane biofilm reactor (EMBFR) technology offers productive solutions for volatile and semi-volatile compound removal from water bodies. In this study, the bacterial strains Paenibacillus etheri SH7T (CECT 8558), Agrobacterium sp. MS2 (CECT 8557) and Rhodococcus ruber strains A5 (CECT 8556), EE6 (CECT 8612) and EE1 (CECT 8555), previously isolated from fuel-contaminated sites, were tested for adherence on tubular semipermeable membranes in laboratory-scale systems designed for methyl tert-butyl ether (MTBE) bioremediation. Biofilm formation on the membrane surface was evaluated through observation by field-emission scanning electron microscope (FESEM) as well as the acute toxicity (as EC50) of the bacterial growth media. Moreover, extracellular polymeric substance (EPS) production for each strain under different MTBE concentrations was measured. Strains A5 and MS2 were biofilm producers and their adherence increased when the MTBE flowed through the inner tubular semipermeable membrane. No biofilm was formed by Paenibacillus etheri SH7T, nevertheless, the latter and strain MS2 exhibited the lowest toxicity after growth on the EMBFR. The results obtained from FESEM and toxicity analysis demonstrate that bacterial strains R. ruber EE6, A5, P. etheri SH7T and Agrobacterium sp. MS2 could be excellent candidates to be used as selective inocula in EMBFR technology for MTBE bioremediation.
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Affiliation(s)
- I M Guisado
- Environmental Microbiology Group, Department of Microbiology and Institute of Water Research, University of Granada, C/ Ramón y Cajal, n°4, Granada 18071, Spain E-mail:
| | - J Purswani
- Environmental Microbiology Group, Department of Microbiology and Institute of Water Research, University of Granada, C/ Ramón y Cajal, n°4, Granada 18071, Spain E-mail:
| | - L Catón-Alcubierre
- Environmental Microbiology Group, Department of Microbiology and Institute of Water Research, University of Granada, C/ Ramón y Cajal, n°4, Granada 18071, Spain E-mail:
| | - J González-López
- Environmental Microbiology Group, Department of Microbiology and Institute of Water Research, University of Granada, C/ Ramón y Cajal, n°4, Granada 18071, Spain E-mail:
| | - C Pozo
- Environmental Microbiology Group, Department of Microbiology and Institute of Water Research, University of Granada, C/ Ramón y Cajal, n°4, Granada 18071, Spain E-mail:
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10
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Guisado IM, Purswani J, González-López J, Pozo C. An extractive membrane biofilm reactor as alternative technology for the treatment of methyltert-butyl ether contaminated water. Biotechnol Prog 2016; 32:1238-1245. [DOI: 10.1002/btpr.2311] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 04/28/2016] [Indexed: 11/09/2022]
Affiliation(s)
- I. M. Guisado
- Environmental Microbiology Group, Institute of Water Research, University of Granada; C/Ramón Y Cajal, nº4 Granada 18071 Spain
- Dept. of Microbiology; Faculty of Sciences, Av. Fuentenueva, s/n. Granada, 18071, Spain
| | - J. Purswani
- Environmental Microbiology Group, Institute of Water Research, University of Granada; C/Ramón Y Cajal, nº4 Granada 18071 Spain
- Dept. of Microbiology; Faculty of Sciences, Av. Fuentenueva, s/n. Granada, 18071, Spain
| | - J. González-López
- Environmental Microbiology Group, Institute of Water Research, University of Granada; C/Ramón Y Cajal, nº4 Granada 18071 Spain
- Dept. of Microbiology; Faculty of Pharmacy, Campus Cartuja. Granada, 18071, Spain
| | - C. Pozo
- Environmental Microbiology Group, Institute of Water Research, University of Granada; C/Ramón Y Cajal, nº4 Granada 18071 Spain
- Dept. of Microbiology; Faculty of Sciences, Av. Fuentenueva, s/n. Granada, 18071, Spain
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11
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Perni S, Hackett L, Goss RJM, Simmons MJ, Overton TW. Optimisation of engineered Escherichia coli biofilms for enzymatic biosynthesis of l-halotryptophans. AMB Express 2013; 3:66. [PMID: 24188712 PMCID: PMC3843566 DOI: 10.1186/2191-0855-3-66] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Accepted: 10/19/2013] [Indexed: 11/10/2022] Open
Abstract
Engineered biofilms comprising a single recombinant species have demonstrated remarkable activity as novel biocatalysts for a range of applications. In this work, we focused on the biotransformation of 5-haloindole into 5-halotryptophan, a pharmaceutical intermediate, using Escherichia coli expressing a recombinant tryptophan synthase enzyme encoded by plasmid pSTB7. To optimise the reaction we compared two E. coli K-12 strains (MC4100 and MG1655) and their ompR234 mutants, which overproduce the adhesin curli (PHL644 and PHL628). The ompR234 mutation increased the quantity of biofilm in both MG1655 and MC4100 backgrounds. In all cases, no conversion of 5-haloindoles was observed using cells without the pSTB7 plasmid. Engineered biofilms of strains PHL628 pSTB7 and PHL644 pSTB7 generated more 5-halotryptophan than their corresponding planktonic cells. Flow cytometry revealed that the vast majority of cells were alive after 24 hour biotransformation reactions, both in planktonic and biofilm forms, suggesting that cell viability was not a major factor in the greater performance of biofilm reactions. Monitoring 5-haloindole depletion, 5-halotryptophan synthesis and the percentage conversion of the biotransformation reaction suggested that there were inherent differences between strains MG1655 and MC4100, and between planktonic and biofilm cells, in terms of tryptophan and indole metabolism and transport. The study has reinforced the need to thoroughly investigate bacterial physiology and make informed strain selections when developing biotransformation reactions.
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