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The treatment of mercury-bearing activared carbon from a gas cleaning system by electro-oxidastion
2003 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Natural gas is contaminated with mercury, which is very toxic, so before using natural gas it is essential to remove the mercury. This can be done by contacting the gas with activated carbon that is impregnated with sulphur, the mercury will then be adsorbed in the carbon structure. That brings us to the aim of this study, which is to extract the mercury compounds from the carbon. The process used was electroleaching, it was carried out in a cell where the carbon was employed as the anode, and a sodium chloride solution was utilized as electrolyte. When the mercury compounds were extracted from the carbon the formation of HgCl42- took place. Next these were transported through the membrane to the cathodic sections, where they got reduced to elemental mercury and consequently they were deposited on the cathode surface. In this study experiments were carried out at different current intensities, flow rates and with different current feeders and cathodes. It was concluded that it is possible to remove mercury from activated carbon by electroleaching, furthermore the extraction rate will be faster when higher current intensity and flow rates are used. Additionally the process can be enhanced by employing a three-dimensional electrode as cathode, due to the fact that these provide a higher surface area, consequently the deposition of mercury will be faster. It is necessary to extend the electrolysis time if one wants to extract all the mercury from the activated carbon. If the carbon is supposed to be used as a source for energy it should be absolutely free from mercury. However one should consider the possibility of re-using it in the gas cleaning system, in that case it might not be necessary to remove all the mercury.

Place, publisher, year, edition, pages
Keyword [en]
Technology, electrolytic treatment, activated carbon, electro-oxidation
Keyword [sv]
URN: urn:nbn:se:ltu:diva-55127ISRN: LTU-EX--03/020--SELocal ID: c055b3bf-ecee-4888-a0e8-1adddc1c99a7OAI: diva2:1028508
Subject / course
Student thesis, at least 30 credits
Educational program
Chemical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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