正渗透膜对水中重金属的处理效果研究
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摘要
以1 mol/L KCl为汲取液,不同浓度重金属溶液为原液,进行了正渗透水处理试验。试验结果表明:随着正渗透处理时间的增加,原液逐渐被浓缩。水通量呈现出了先下降后上升,再下降的过程。反向盐通量以重金属Cd原液最高。正向截留率Cd原液最小,其他4种重金属原液处理间无显著差异。重金属拦截率显示了CTA正渗透膜对5种重金属拦截效果较好。5种重金属的拦截率大小依次为:Cd>Hg>As>Cr>Pb。
Using 1 mol/L of KCl as drawing solution and heavy metals with different concentrations as stocksolution,forward osomsis(FO)water treatment tests have been conducted. The experimental results show that withthe increase of FO treatment time,the stock solution is concentrated gradually. The water fluxes demonstrate aprocess of decrease-increase first and decrease again. Heavy metal Cd stock solution has the highest reverse saltflux and Cd stock solution has the lowest forward rejection rate. The other four kinds of heavy metals stock solutiontreatment do not have significant difference. Heavy metal rejection rate shows that CTA FO membrane has betterrejection effect. The subsequence of rejection rates of the five kinds of heavy metals is as follows:Cd>Hg>As>Cr>Pb.
Using 1 mol/L of KCl as drawing solution and heavy metals with different concentrations as stocksolution,forward osomsis(FO)water treatment tests have been conducted. The experimental results show that withthe increase of FO treatment time,the stock solution is concentrated gradually. The water fluxes demonstrate aprocess of decrease-increase first and decrease again. Heavy metal Cd stock solution has the highest reverse saltflux and Cd stock solution has the lowest forward rejection rate. The other four kinds of heavy metals stock solutiontreatment do not have significant difference. Heavy metal rejection rate shows that CTA FO membrane has betterrejection effect. The subsequence of rejection rates of the five kinds of heavy metals is as follows:Cd>Hg>As>Cr>Pb.
引文
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[2]蔡巍.水环境重金属检测微传感器及自动分析仪器的研究[D].杭州:浙江大学,2012.
[3]常晋娜,瞿建国.水体重金属污染的生态效应及生物监测[J].四川环境,2005,24(4):29-33.
[4]何刚,耿晨光,罗睿.重金属污染的治理及重金属对水生植物的影响[J].贵州农业科学,2008,36(3):147-150.
[5]Phuntsho S,Shon H K,Hong S,et al.A novel low energy fertilizer driven forward osmosis desalination for direct fertigation:Evaluating the performance of fertilizer draw solutions[J].Journal of Membrane Science,2011,375(1):172-181.
[6]Achilli A,Cath T Y,Childress A E.Selection of inorganic-based draw solutions for forward osmosis applications[J].Journal of Membrane Science,2010,364(1):233-241.
[7]Phuntsho S,Shon H K,Majeed T,et al.Blended Fertilizers as Draw Solutions for Fertilizer-Drawn Forward Osmosis Desalination[J].Environmental Science&Technology,2012,46(8):4567-4575.