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Dohare S, Rawat HK, Bhargava Y, Kango N. Characterization of Diesel Degrading Indigenous Bacterial Strains, Acinetobacter pittii and Pseudomonas aeruginosa, Isolated from Oil Contaminated Soils. Indian J Microbiol 2024; 64:749-757. [PMID: 39011005 PMCID: PMC11246406 DOI: 10.1007/s12088-024-01317-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Accepted: 05/20/2024] [Indexed: 07/17/2024] Open
Abstract
In this study, 13 diesel degrading bacteria were isolated from the oil contaminated soils and the promising strains identified as Acinetobacter pittii ED1 and Pseudomonas aeruginosa BN were evaluated for their diesel degrading capabilities. These strains degraded the diesel optimally at 30 °C, pH 7.0 and 1% diesel concentration. Both the strains produced biofilm at 1% diesel concentration indicating their ability to tolerate diesel induced abiotic stress. Gravimetric analysis of the spent medium after 7 days of incubation showed that A. pittii ED1 and P. aeruginosa BN degraded 68.61% and 76% diesel, respectively, while biodegradation reached more than 90% after 21 days. Fourier Transform Infrared (FTIR) analysis of the degraded diesel showed 1636.67 cm-1 (C=C stretch, N-H bond) peak corresponding to alkenes and primary amines, while GC-TOF-MS analysis showed decline in hydrocarbon intensities after 7 days of incubation. The present study revealed that newly isolated A. pittii ED1 and P. aeruginosa BN were able to degrade diesel hydrocarbons (C11-C18, and C19-C24) efficiently and have potential for bioremediation of the oil-contaminated sites. Supplementary Information The online version contains supplementary material available at 10.1007/s12088-024-01317-3.
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Affiliation(s)
- Sonam Dohare
- Department of Microbiology, Doctor Harisingh Gour Vishwavidyalaya (A Central University), Sagar, MP 470003 India
| | - Hemant Kumar Rawat
- Department of Microbiology, Doctor Harisingh Gour Vishwavidyalaya (A Central University), Sagar, MP 470003 India
| | - Yogesh Bhargava
- Department of Microbiology, Doctor Harisingh Gour Vishwavidyalaya (A Central University), Sagar, MP 470003 India
| | - Naveen Kango
- Department of Microbiology, Doctor Harisingh Gour Vishwavidyalaya (A Central University), Sagar, MP 470003 India
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Mishra B, Varjani S, Kumar G, Awasthi MK, Awasthi SK, Sindhu R, Binod P, Rene ER, Zhang Z. Microbial approaches for remediation of pollutants: Innovations, future outlook, and challenges. ENERGY & ENVIRONMENT 2021; 32:1029-1058. [DOI: 10.1177/0958305x19896781] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/20/2023]
Abstract
Environmental contamination with persistent organic pollutants has emerged as a serious threat of pollution. Bioremediation is a key to eliminate these harmful pollutants from the environment and has gained the interest of researchers during the past few decades. Scientific knowledge upon microbial interactions with individual pollutants over the past decades has helped to abate environmental pollution. Traditional bioremediation approaches have limitations for their applications; hence, it is essential to discover new bioremediation approaches with biotechnological interventions for best results. The developments in various methodologies are expected to increase the efficiency of bioremediation techniques and provide environmentally sound strategies. This paper deals with the profiling of microorganisms present in polluted sites using various techniques such as culture-based approaches and omics-based approaches. Besides this, it also provides up-to-date scientific literature on the microbial electrochemical technologies which are nowadays considered as the best approach for remediation of pollutants. Detailed information about future outlook and challenges to evaluate the effect of various treatment technologies for remediation of pollutants has been discussed.
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Affiliation(s)
- Bishwambhar Mishra
- Department of Biotechnology, Chaitanya Bharathi Institute of Technology, Hyderabad, India
| | - Sunita Varjani
- Paryavaran Bhavan, Gujarat Pollution Control Board, Gandhinagar, India
| | - Gopalakrishnan Kumar
- Institute of Chemistry, Bioscience and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, Stavanger, Norway
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A& F University, Shaanxi Province, PR China
| | - Sanjeev Kumar Awasthi
- College of Natural Resources and Environment, Northwest A& F University, Shaanxi Province, PR China
| | - Raveendran Sindhu
- CSIR–National Institute for Interdisciplinary Science and Technology (NIIST), Trivandrum, India
| | - Parameswaran Binod
- CSIR–National Institute for Interdisciplinary Science and Technology (NIIST), Trivandrum, India
| | - Eldon R Rene
- Department of Environmental Engineering and Water Technology, IHE Delft Institute of Water Education, Delft, The Netherlands
| | - Zengqiang Zhang
- College of Natural Resources and Environment, Northwest A& F University, Shaanxi Province, PR China
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Gao Y, Du J, Bahar MM, Wang H, Subashchandrabose S, Duan L, Yang X, Megharaj M, Zhao Q, Zhang W, Liu Y, Wang J, Naidu R. Metagenomics analysis identifies nitrogen metabolic pathway in bioremediation of diesel contaminated soil. CHEMOSPHERE 2021; 271:129566. [PMID: 33460896 DOI: 10.1016/j.chemosphere.2021.129566] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 11/11/2020] [Accepted: 01/02/2021] [Indexed: 06/12/2023]
Abstract
Nitrogen amendment is known to effectively enhance the bioremediation of hydrocarbon-contaminated soil, but the nitrogen metabolism in this process is not well understood. To unravel the nitrogen metabolic pathway(s) of diesel contaminated soil, six types of nitrogen sources were added to the diesel contaminated soil. Changes in microbial community and soil enzyme genes were investigated by metagenomics analysis and chemical analysis through a 30-day incubation study. The results showed that ammonium based nitrogen sources significantly accelerated the degradation of total petroleum hydrocarbon (TPH) (79-81%) compared to the control treatment (38%) and other non-ammonium based nitrogen amendments (43-57%). Different types of nitrogen sources could dramatically change the microbial community structure and soil enzyme gene abundance. Proteobacteria and Actinobacteria were identified as the two dominant phyla in the remediation of diesel contaminated soil. Metagenomics analysis revealed that the preferred metabolic pathway of nitrogen was from ammonium to glutamate via glutamine, and the enzymes governing this transformation were glutamine synthetase and glutamate synthetase; while in nitrate based amendment, the conversion from nitrite to ammonium was restrained by the low abundance of nitrite reductase enzyme and therefore retarded the TPH degradation rate. It is concluded that during the process of nitrogen enhanced bioremediation, the most efficient nitrogen cycling direction was from ammonium to glutamine, then to glutamate, and finally joined with carbon metabolism after transforming to 2-oxoglutarate.
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Affiliation(s)
- Yongchao Gao
- Qilu University of Technology (Shandong Academy of Sciences), Ecology Institute, Shandong Provincial Key Laboratory of Applied Microbiology, 28789 East Jingshi Road, Jinan, 250103, China; Global Centre for Environmental Remediation, Faculty of Science, University of Newcastle, Callaghan, NSW, 2308, Australia.
| | - Jianhua Du
- Global Centre for Environmental Remediation, Faculty of Science, University of Newcastle, Callaghan, NSW, 2308, Australia
| | - Md Mezbaul Bahar
- Global Centre for Environmental Remediation, Faculty of Science, University of Newcastle, Callaghan, NSW, 2308, Australia
| | - Hui Wang
- School of Resources and Environment, University of Jinan, Jinan, 250022, China
| | - Suresh Subashchandrabose
- Global Centre for Environmental Remediation, Faculty of Science, University of Newcastle, Callaghan, NSW, 2308, Australia
| | - Luchun Duan
- Global Centre for Environmental Remediation, Faculty of Science, University of Newcastle, Callaghan, NSW, 2308, Australia
| | - Xiaodong Yang
- Department of Geography & Spatial Information Technology, Ningbo University, Ningbo, 315211, China
| | - Mallavarapu Megharaj
- Global Centre for Environmental Remediation, Faculty of Science, University of Newcastle, Callaghan, NSW, 2308, Australia
| | - Qingqing Zhao
- Qilu University of Technology (Shandong Academy of Sciences), Ecology Institute, Shandong Provincial Key Laboratory of Applied Microbiology, 28789 East Jingshi Road, Jinan, 250103, China
| | - Wen Zhang
- Qilu University of Technology (Shandong Academy of Sciences), Ecology Institute, Shandong Provincial Key Laboratory of Applied Microbiology, 28789 East Jingshi Road, Jinan, 250103, China
| | - Yanju Liu
- Global Centre for Environmental Remediation, Faculty of Science, University of Newcastle, Callaghan, NSW, 2308, Australia
| | - Jianing Wang
- Qilu University of Technology (Shandong Academy of Sciences), Ecology Institute, Shandong Provincial Key Laboratory of Applied Microbiology, 28789 East Jingshi Road, Jinan, 250103, China
| | - Ravi Naidu
- Global Centre for Environmental Remediation, Faculty of Science, University of Newcastle, Callaghan, NSW, 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment, Australia.
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4
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Varjani S, Upasani VN. Comparing Bioremediation Approaches for Agricultural Soil Affected with Petroleum Crude: A Case Study. Indian J Microbiol 2019; 59:356-364. [PMID: 31388214 DOI: 10.1007/s12088-019-00814-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 06/28/2019] [Indexed: 10/26/2022] Open
Abstract
The aim of work was to check and make comparison of efficacy for five approaches for petroleum crude contaminated agricultural soil remediation by making use of soil microcosms. Concerning the published literature in our information, this is the first report comparing five approaches i.e. abiotic losses, native microbial flora, nutrient amendments and pre-adapted native microbial culture and concurrent amendments of nutrients + pre-adapted native microbial culture for agricultural soil bioremediation using Pseudomonas aeruginosa NCIM 5514 by performing soil microcosm experiments. 96.00 ± 0.18% degradation of petroleum hydrocarbon fractions in 60 days of the experiment was observed when nutrients and P. aeruginosa NCIM 5514 were applied concomitantly. In nutrients- and P. aeruginosa NCIM 5514-added microcosm reduction in nitrogen, organic carbon, and phosphorus was noted. P. aeruginosa NCIM 5514, can be applied as a prospective bioremediation agent to remediate petroleum crude contaminated soil.
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Affiliation(s)
- Sunita Varjani
- Gujarat Pollution Control Board, Gandhinagar, Gujarat 382010 India
| | - Vivek N Upasani
- 2Department of Microbiology, M. G. Science Institute, Ahmedabad, Gujarat 380009 India
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Defosse TA, Le Govic Y, Courdavault V, Clastre M, Vandeputte P, Chabasse D, Bouchara JP, Giglioli-Guivarc'h N, Papon N. [Yeasts from the CTG clade (Candida clade): Biology, impact in human health, and biotechnological applications]. J Mycol Med 2018; 28:257-268. [PMID: 29545121 DOI: 10.1016/j.mycmed.2018.02.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 02/05/2018] [Accepted: 02/12/2018] [Indexed: 11/29/2022]
Abstract
Among the subdivision of Saccharomycotina (ascomycetes budding yeasts), the CTG clade (formerly the Candida clade) includes species that display a particular genetic code. In these yeasts, the CTG codon is predominantly translated as a serine instead of a leucine residue. It is now well-known that some CTG clade species have a major impact on human and its activities. Some of them are recognized as opportunistic agents of fungal infections termed candidiasis. In addition, another series of species belonging to the CTG clade draws the attention of some research groups because they exhibit a strong potential in various areas of biotechnology such as biological control, bioremediation, but also in the production of valuable biocompounds (biofuel, vitamins, sweeteners, industrial enzymes). Here we provide an overview of recent advances concerning the biology, clinical relevance, and currently tested biotechnological applications of species of the CTG clade. Future directions for scientific research on these particular yeasts are also discussed.
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Affiliation(s)
- T A Defosse
- Groupe d'étude des interactions Hôte-Pathogène (EA 3142), SFR interactions cellulaires et applications thérapeutiques, université d'Angers, 49933 Angers, France; EA 2106, université de Tours, biomolécules et biotechnologies végétales, Tours, France
| | - Y Le Govic
- Groupe d'étude des interactions Hôte-Pathogène (EA 3142), SFR interactions cellulaires et applications thérapeutiques, université d'Angers, 49933 Angers, France; Laboratoire de parasitologie - mycologie, centre hospitalier universitaire d'Angers, Angers, France
| | - V Courdavault
- EA 2106, université de Tours, biomolécules et biotechnologies végétales, Tours, France
| | - M Clastre
- EA 2106, université de Tours, biomolécules et biotechnologies végétales, Tours, France
| | - P Vandeputte
- Groupe d'étude des interactions Hôte-Pathogène (EA 3142), SFR interactions cellulaires et applications thérapeutiques, université d'Angers, 49933 Angers, France; Laboratoire de parasitologie - mycologie, centre hospitalier universitaire d'Angers, Angers, France
| | - D Chabasse
- Groupe d'étude des interactions Hôte-Pathogène (EA 3142), SFR interactions cellulaires et applications thérapeutiques, université d'Angers, 49933 Angers, France; Laboratoire de parasitologie - mycologie, centre hospitalier universitaire d'Angers, Angers, France
| | - J-P Bouchara
- Groupe d'étude des interactions Hôte-Pathogène (EA 3142), SFR interactions cellulaires et applications thérapeutiques, université d'Angers, 49933 Angers, France; Laboratoire de parasitologie - mycologie, centre hospitalier universitaire d'Angers, Angers, France
| | - N Giglioli-Guivarc'h
- EA 2106, université de Tours, biomolécules et biotechnologies végétales, Tours, France
| | - N Papon
- Groupe d'étude des interactions Hôte-Pathogène (EA 3142), SFR interactions cellulaires et applications thérapeutiques, université d'Angers, 49933 Angers, France.
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Liu G, Zhong H, Yang X, Liu Y, Shao B, Liu Z. Advances in applications of rhamnolipids biosurfactant in environmental remediation: A review. Biotechnol Bioeng 2018; 115:796-814. [PMID: 29240227 DOI: 10.1002/bit.26517] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 10/05/2017] [Accepted: 12/04/2017] [Indexed: 12/30/2022]
Abstract
The objective of this review is to provide a comprehensive overview of the advances in the applications of rhamnolipids biosurfactants in soil and ground water remediation for removal of petroleum hydrocarbon and heavy metal contaminants. The properties of rhamnolipids associated with the contaminant removal, that is, solubilization, emulsification, dispersion, foaming, wetting, complexation, and the ability to modify bacterial cell surface properties, were reviewed in the first place. Then current remediation technologies with integration of rhamnolipid were summarized, and the effects and mechanisms for rhamnolipid to facilitate contaminant removal for these technologies were discussed. Finally rhamnolipid-based methods for remediation of the sites co-contaminated by petroleum hydrocarbons and heavy metals were presented and discussed. The review is expected to enhance our understanding on environmental aspects of rhamnolipid and provide some important information to guide the extending use of this fascinating chemical in remediation applications.
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Affiliation(s)
- Guansheng Liu
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei, China.,School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan, Hubei, China
| | - Hua Zhong
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei, China.,School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan, Hubei, China
| | - Xin Yang
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, China
| | - Yang Liu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, China
| | - Binbin Shao
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, China
| | - Zhifeng Liu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, China
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Zdarta A, Smułek W, Pietraszak E, Kaczorek E, Olszanowski A. Hydrocarbons biodegradation by activated sludge bacteria in the presence of natural and synthetic surfactants. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2016; 51:1262-1268. [PMID: 27533134 DOI: 10.1080/10934529.2016.1215194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Fuels, such as diesel oil, can have a substantial impact on the microbial equilibrium of activated sludge and have a negative influence on work of wastewater treatment plant. The primary objective of the research was to examine the possibility of using the surfactants to improve pollutants biodegradation by bacteria from activated sludge. The results showed that the addition of rhamnolipids allows to increase the hydrocarbon biodegradation from 47% up to 75% in the cultures inoculated with the consortium. The saponins increased the degradation of diesel oil by the two isolated strains: from 27% to 43% for Alcaligenes sp. and from 44% to 64% for Pseudomonas sp. The addition of surfactants to the cultures growth with diesel oil caused a significant decrease of the surface charge for Alcaligenes strain in the presence of saponins, but not in other cases. The obtained results revealed the potential of natural surfactants to support hydrocarbon biodegradation in wastewater treatment plants.
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Affiliation(s)
- Agata Zdarta
- a Institute of Chemical Technology and Engineering, Poznan University of Technology , Poznan , Poland
| | - Wojciech Smułek
- a Institute of Chemical Technology and Engineering, Poznan University of Technology , Poznan , Poland
| | - Emilia Pietraszak
- a Institute of Chemical Technology and Engineering, Poznan University of Technology , Poznan , Poland
| | - Ewa Kaczorek
- a Institute of Chemical Technology and Engineering, Poznan University of Technology , Poznan , Poland
| | - Andrzej Olszanowski
- a Institute of Chemical Technology and Engineering, Poznan University of Technology , Poznan , Poland
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Huang X, Zhang Y, Wei Y, Liu J, Lu L, Peng K. Saponin-enhanced biomass accumulation and demulsification capability of the demulsifying bacteria Alcaligenes sp. S-XJ-1. RSC Adv 2016. [DOI: 10.1039/c6ra02237e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Saponin significantly enhanced biomass accumulation and demulsification capability of the demulsifying bacteria.
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Affiliation(s)
- Xiangfeng Huang
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Ministry of Education Key Laboratory of Yangtze River Water Environment
- Tongji University
- Shanghai 200092
| | - Yuyan Zhang
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Ministry of Education Key Laboratory of Yangtze River Water Environment
- Tongji University
- Shanghai 200092
| | - Yansong Wei
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Ministry of Education Key Laboratory of Yangtze River Water Environment
- Tongji University
- Shanghai 200092
| | - Jia Liu
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Ministry of Education Key Laboratory of Yangtze River Water Environment
- Tongji University
- Shanghai 200092
| | - Lijun Lu
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Ministry of Education Key Laboratory of Yangtze River Water Environment
- Tongji University
- Shanghai 200092
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Sharma JK, Gautam RK, Misra RR, Kashyap SM, Singh SK, Juwarkar AA. Degradation of Di- Through Hepta-Chlorobiphenyls in Clophen Oil Using Microorganisms Isolated from Long Term PCBs Contaminated Soil. Indian J Microbiol 2014; 54:337-42. [PMID: 24891742 DOI: 10.1007/s12088-014-0459-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 02/11/2014] [Indexed: 11/29/2022] Open
Abstract
Present work describes microbial degradation of selected polychlorinated biphenyls (PCBs) congeners in Clophen oil which is used as transformer oil and contains high concentration of PCBs. Indigenous PCBs degrading bacteria were isolated from Clophen oil contaminated soil using enrichment culture technique. A 15 days study was carried out to assess the biodegradation potential of two bacterial cultures and their consortium for Clophen oil with a final PCBs concentration of 100 mg kg(-1). The degradation capability of the individual bacterium and the consortium towards the varying range of PCBs congeners (di- through hepta-chlorobiphenyls) was determined using GCMS. Also, dehydrogenase enzyme was estimated to assess the microbial activity. Maximum degradation was observed in treatment containing consortium that resulted in up to 97 % degradation of PCB-44 which is a tetra chlorinated biphenyl whereas, hexa chlorinated biphenyl congener (PCB-153) was degraded up to 90 % by the consortium. This indicates that the degradation capability of microbial consortium was significantly higher than that of individual cultures. Furthermore, the results suggest that for degradation of lower as well as higher chlorinated PCB congeners; a microbial consortium is required rather than individual cultures.
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Affiliation(s)
- Jitendra K Sharma
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440020 India
| | - Ravindra K Gautam
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440020 India
| | - Rashmi R Misra
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440020 India
| | - Sanjay M Kashyap
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440020 India
| | - Sanjeev K Singh
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440020 India
| | - Asha A Juwarkar
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440020 India
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Liu J, Chen Y, Xu R, Jia Y. Screening and evaluation of biosurfactant-producing strains isolated from oilfield wastewater. Indian J Microbiol 2013; 53:168-74. [PMID: 24426104 DOI: 10.1007/s12088-013-0379-y] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Accepted: 02/13/2013] [Indexed: 11/26/2022] Open
Abstract
The six biosurfactant-producing strains, isolated from oilfield wastewater in Daqing oilfield, were screened. The production of biosurfactant was verified by measuring the diameter of the oil spreading, measuring the surface tension value and emulsifying capacity against xylene, n-pentane, kerosene and crude oil. The experimental result showed three strains (S2, S3, S6) had the better surface activity. Among the three strains, the best results were achieved when using S2 strain. The diameter of the oil spreading of the biosurfactant produced by S2 strain was 14 cm, its critical micelle concentration (CMC) was 21.8 mg/l and the interfacial tension between crude oil and biosurfactant solution produced by S2 strain reduced to 25.7 mN/m. The biosurfactant produced by S2 strain was capable of forming stable emulsions with various hydrocarbons, such as xylene, n-pentane, kerosene and crude oil. After S2 strain treatment, the reduction rate of oil viscosity was 51 % and oil freezing point reduced by 4 °C.
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Affiliation(s)
- Jianghong Liu
- Provincial Key Laboratory of Oil and Gas Chemical Technology, College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, 163318 Heilongjiang China
| | - Yitong Chen
- Provincial Key Laboratory of Oil and Gas Chemical Technology, College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, 163318 Heilongjiang China
| | - Ruidan Xu
- School of Life Sciences, Xiamen University, Xiamen, 361005 Fujian China
| | - Yunpeng Jia
- Provincial Key Laboratory of Oil and Gas Chemical Technology, College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, 163318 Heilongjiang China
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