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Desalination of Produced Water via Gas Hydrate Formation and Post Treatment

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dc.contributor.authorNiu, Jingen
dc.contributor.committeechairYoon, Roe-Hoanen
dc.contributor.committeememberLuttrell, Gerald H.en
dc.contributor.committeememberAdel, Gregory T.en
dc.contributor.committeememberGandour, Richard D.en
dc.contributor.departmentMining and Minerals Engineeringen
dc.date.accessioned2017-04-04T19:49:31Zen
dc.date.adate2012-08-14en
dc.date.available2017-04-04T19:49:31Zen
dc.date.issued2012-04-19en
dc.date.rdate2016-10-07en
dc.date.sdate2012-07-12en
dc.description.abstractThis study presents a two-step desalination process, in which produced water is cleaned by forming gas hydrate in it and subsequently dewatering the hydrate to remove the residual produced water trapped in between the hydrate crystals. All experiments were performed with pressure in the range of 450 to 800psi and temperature in the range of -1 to 1°C using CO? as guest molecule for the hydrate crystals. The experiments were conducted using artificial produced waters containing different amounts of NaCl, CaCl₂ and MgCl₂ at varying temperature (T) and pressure (P). The results are presented as functions of %Reduction of difference chemical elements, CO? requirements and applied T and P conditions. The impact of dewatering techniques, including centrifuge and filtration process, on gas hydrate solid product is studied. The results showed that over 99% of dissolved NaCl and MgCl2 can be removed from artificial saline water in laboratory experiments. This was achieved in a process involving a single-stage hydrate formation step, followed by a single-step solid-liquid separation (or dewatering). The results also show that the %Reduction (percentage of the concentration decrease) of artificial produced water increases with centrifugation time and rotational speed (rpm). The %Reduction was increased considerably after hydrate crystals were crushed and filtered, indicating that the artificial process water was entrapped in between the hydrate crystals. It was found also that the finer the particle size, the higher the extent of salt removal. In general, filtration was a better than centrifugation for the removal of TDS (Total Dissolved Solids).en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-07122012-172310en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07122012-172310/en
dc.identifier.urihttp://hdl.handle.net/10919/76822en
dc.language.isoen_USen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectDesalinationen
dc.subjectgas hydrateen
dc.titleDesalination of Produced Water via Gas Hydrate Formation and Post Treatmenten
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMining and Minerals Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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