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Rhamonolipids produced by Pseudomonas aeruginosa promotes methane hydrates formation in fixed bed silica gel medium

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Abstract

Natural gas hydrates are seen as an alternative future energy source. They have also been valued for their carbon dioxide capturing capability, gas separation, desalination, natural gas storage and transportation. Developing economical and viable gas hydrate based technology is one of the most promising research areas of present decade. Successful commercialization of gas hydrate based technology is often curtailed due to slow formation rate. The present study evaluates biosurfactant as a kinetic promoter of methane hydrates formation in a fixed bed C type silica gel medium. Biosurfactant was produced by growing Pseudomonas aeruginosa strain A11 in glycerol supplemented mineral salt medium. Biosurfactant characterization with FTIR, NMR and MALDI-TOF spectroscopy reveled it to be a glycolipids type biosurfactant namely rhamnolipids. Saturating C type silica gel with of 100 ppm rhamnolipids solution enhanced the rate of methane hydrates formation by reducing the induction time. Mole of methane consumed and percentage of water to hydrate conversion was observed to be more in 1000 ppm rhamnolipids saturated C type silica gel as compared to quiescent water system and water saturated silica gel system. Overall results suggest that rhamonolipids produced by strain A11 in combination with silica gel can be utilized as environmentally safe kinetic promoter for methane hydrate formation.

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Acknowledgements

The support provided by sending Amit Arora on study leave from Shaheed Bhagat Singh State Technical Campus Ferozepur to Indian Institute of Technology Roorkee is highly acknowledged. The support from institutes namely Indian Institute of Technology Roorkee Roorkee India National Chemical Laboratory (CSIR) Maharashtra Pune India, Institute of Microbial Technology (CSIR) UT Chandigarh India Keshav Dev Malviya Institute of Petroleum Exploration Oil and Natural Gas Corporation (ONGC) Uttrakhand Dehradun India Gas Hydrate Research & Technology Centre Oil and Natural Gas Corporation Ltd (ONGC) ONGC Complex Phase-II Panvel Navi Mumbai India Indian Institute of Technology (Indian School of Mines) Jharkhand Dhanbad India Indian Institute of Technology Madras Chennai is highly acknowledged.

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Arora, A., Cameotra, S.S., Balomajumder, C. et al. Rhamonolipids produced by Pseudomonas aeruginosa promotes methane hydrates formation in fixed bed silica gel medium. Mar Geophys Res 42, 5 (2021). https://doi.org/10.1007/s11001-020-09426-6

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  • DOI: https://doi.org/10.1007/s11001-020-09426-6

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