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Fouling of RO membranes in a vibrato...

Shi, Wei.

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Fouling of RO membranes in a vibratory shear enhanced processing (VSEP) system.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Fouling of RO membranes in a vibratory shear enhanced processing (VSEP) system./
作者:	Shi, Wei.
面頁冊數:	146 p.
附註:	Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 6306.
Contained By:	Dissertation Abstracts International71-10B.
標題:	Engineering, Civil. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3422012
ISBN:	9781124229300

Fouling of RO membranes in a vibratory shear enhanced processing (VSEP) system.
Shi, Wei.

Fouling of RO membranes in a vibratory shear enhanced processing (VSEP) system. - 146 p.

Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 6306.

Thesis (Ph.D.)--University of Washington, 2010.

Reverse osmosis (RO) is a promising technology used in the desalination industry. However, fouling of RO membranes by inorganic scales has been a great impediment to the extensive application. This study investigated the effect of torsional vibration of membranes in reducing such fouling using a Vibratory Shear Enhanced Processing (VSEP) system to treat a simulated brackish water source and a brine.

ISBN: 9781124229300Subjects--Topical Terms:

783781
Engineering, Civil.

Fouling of RO membranes in a vibratory shear enhanced processing (VSEP) system.
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245 1 0 $a Fouling of RO membranes in a vibratory shear enhanced processing (VSEP) system.
300 $a 146 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 6306.
500 $a Adviser: Mark M. Benjamin.
502 $a Thesis (Ph.D.)--University of Washington, 2010.
520 $a Reverse osmosis (RO) is a promising technology used in the desalination industry. However, fouling of RO membranes by inorganic scales has been a great impediment to the extensive application. This study investigated the effect of torsional vibration of membranes in reducing such fouling using a Vibratory Shear Enhanced Processing (VSEP) system to treat a simulated brackish water source and a brine.
520 $a Baseline treatment with vibration achieved a practical water recovery of over 90% for the brackish solution and 75% for the brine. The average rejection of major solute was mostly over 95% for the brackish solution and over 90% for the brine. The major solids that precipitated were CaCO3 and CaSO4, and the major elements that constituted the scales on the membrane surface were Ca, C, O, Si and possibly S.
520 $a When a direct comparison was made between the systems with and without vibration, vibration reduced membrane fouling and improved solute rejections. The scales on the membrane appeared to provide more open access to the surface in the vibrated than in the stationary systems, and this change in morphology is assumed to be closely related to the change in flux. These transitions occurred smoothly with gradual increments in vibration amplitude.
520 $a The effects of most other individual parameters evaluated were not dramatic as the effect of vibration compared to no vibration. For instance, the presence of natural organic matter led to a slight increase in fouling of a vibrating membrane, and such fouling was slightly exacerbated at higher pH. Increasing TMP increased permeate flux and solute rejections, but had little effect on the effective specific flux. The addition of either SiO2, or CaCO 3 particles to the feed also had a negligible effect on fouling.
520 $a In the painted membrane tests in which the membrane surface was sealed by impermeable epoxy resin except for a slim ring at a certain radius, fouling developed similarly in each paired tests that have the same average shear rate and decreased as shear rate increased. Shear rate was a major factor that governs fouling of RO membranes during treatment of the synthetic brine.
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791 $a Ph.D.
792 $a 2010
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