

@mastersthesis {6239,
	title = {Study on seawater desalination pre-treatment using nanofiltration technology},
	year = {2005},
	note = {H019850},
	school = {Shanghai University (People{\textquoteright}s Republic of China)},
	type = {phdM.{S}.},
	address = {Ann Arbor},
	abstract = {As the sustained economic development of our country and the increasing improvement of people{\textquoteright}s living standard{\textquestiondown}the imbalance between supply and demand of water resource is conspicuous day by day{\textquestiondown}and people{\textquoteright}s requisition for domestic water is higher and higher- Desalinization{\textquestiondown}as an important technological means for solving the deficient of water resource{\textquestiondown}will make greater contribution for the development of our economic and social- But it has not been widely accepted over the world just because of its high energy and investment- New-type desalination technology FTC(flow-through capacitor) has the characteristics of low cost and low energy consumption{\textquestiondown}etc- which have already become the new light spots of desalinization technology-With systematic operation, the density of dirt ion on the electrode surface increases constantly, and finally causes insoluble salts, such as calcium carbonate, deposit in electrode surface, which influence the electric conductivity of the electrode, and then influence the desalination performance and service life of FTC- So in order to guarantee the electrode has long residual action, it is demanded that enter water does not include two prices and high price dirt ion basically- Nanofiltration Membrane softing is the newest of the water softing processes{\textquestiondown}Comparing with the traditional water softing processes{\textquestiondown}memnbrane softing has the advantanges of no environmental pollution{\textquestiondown}simplicity of the technology and operation-In this article, according to FTC desalination technology inlet requirement, through studying NF membrane{\textquestiondown}s separate performance and its influence factors, a kind of NF membrane as FTC application technology of pretreatment has been developed- 1-In this article{\textquestiondown}desalination experiments of six inorganic salt solutions (NaCl{\textquestiondown}KCl{\textquestiondown}Na2SO4{\textquestiondown}MgCl2{\textquestiondown}CaCl2and MgSO4) are carried out by using HL1812 -The effects of the type and the concentration of salt as well as the pressure on the separation performance and stability of nanofiltation membrane are investigated-Some salt removal rules with nanofiltation are gained-The experimental results showed that the rejections to inorganic electrolytes by the NF membranes increased with the pressure increasing and approached some certain values-Through trials on different univalent ion water show that the rejection effect of NF membrane is different{\textquestiondown}desalination performance of membrane to divalent ion is better than to univalent ion- The rejections to inorganic electrolytes by the NF membranes declined with increasing the electrolyte concentrations and approached some certain values under higher concentrations- 2-Systematic research on NF has been carried aimed at the demand of the desalinization pretreatment{\textquestiondown}which includes: NF fore treatment, membrane combination, operation condition and cleaning manner, corresponding optimum technique was put forward- The experimental results showed that the operating pressure has influence on water removal effect directly{\textquestiondown}the optimal operating pressure is 0-9{\textquestiondown}1-0MPa-Appropriate feed water temperature has also influence on water and removal effect{\textquestiondown}the optimal temperature is 5{\textquestiondown}20{\textquestiondown}-Through adjusting pH of seawater may prevent the scale of non-settleable salt on the membrane surface-Physical wash can recover membrane performance{\textquestiondown}acid wash may acquire favorable effect- 3- To different method of seawater desalination{\textquestiondown}corresponding NF technique was adopted to study desalinization pretreatment, brief analyse and evaluation were put up- The experimental results showed that favorable effect can be acquired utilizing NF as a pretreatment for the removal of hardness and TDS{\textquestiondown}rejection rate of hardness is 83\%{\textquestiondown}rejection rate of salt is 35\%{\textquestiondown}rejection rate of alkalinity is 73\%-The first permeate of nanofiltration can satisfy the feed water of Reverse Osmosis{\textquestiondown}For the FTC{\textquestiondown}the secondary permeate water can meet the feed water quality- Compared with traditional pretreatment technique{\textquestiondown}NF technique has better application prospect in desalinization pretreatment-},
	keywords = {(UMI)AAIH019850, 0494:Physical chemistry, Physical Chemistry, Pure sciences},
	url = {http://search.proquest.com/docview/1027898007?accountid=14270},
	author = {Jiang, Hua}
}
