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Sean LIU 《环境科学学报(英文版)》2003,(6)
IntroductionTheconventionalmethodforsubsurfaceremediationofgroundwatercontaminationwithVOCsistheso called“pump and treat”technology .Thelimitationofthisapproachistheprohibitivelylongtreatmenttimeforremediatingthegroundwatercontaminatedwithcommonchlorinatedsolventsthathavedensitiesgreaterthanthatofwater(classifiedasDNAPLs densenon aqueousphaseliquids) .Thisislargelyduetotheverylowwatersolubilityandlowbiodegradabilityofthisclassofsolventsandthetendencyofthesolventssettlinginthebottomofanaqu… 相似文献
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渗透汽化复合膜分离废水中的低浓度甲醇 总被引:3,自引:1,他引:2
采用两种商品化渗透汽化复合膜--GKSS-GS膜和PDMS-P膜分离模拟低浓度甲醇废水,考察了操作温度、甲醇质量分数、废水流量对膜渗透汽化性能的影响.实验结果表明:随温度升高、废水中甲醇质量分数的增大,两种膜的渗透通量都呈增加趋势;GKSS-GS膜的分离系数变化较明显,而PDMS-P膜的分离系数变化较小;废水流量对渗透通量和分离系数的影响均较小.在最佳条件下,GKSS-GS膜的渗透通量为914.6 g/(m~2·h),分离系数为5.6;PDMS-P膜的渗透通量为1 887.2 g/(m~2·h),分离系数为4.8. 相似文献
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VOC removal from contaminated groundwater through membrane pervaporation. (Ⅰ): Water- 1,1,1- trichloroethane system 总被引:1,自引:0,他引:1
1,1,1-trichloroethane(TCA), a common chlorinated organic solvent and volatile organic compound(VOC), was removed from contaminated groundwater by using a bench-scale membrane pervaporation unit. The effects of TCA concentration, temperature, and flow rate on permeation flux and selectivity(a value) of the process were evaluated. In general, higher temperature leads to higher VOC flux but lower selectivity; higher flow rate of TCA feed stream results in higher VOC flux and selectivity, an indication of the effect of concentration polarization; higher TCA feed concentration produces higher TCA permeation, however, the selectivity was virtually unchanged. 相似文献
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The conventional “ pump-and-treat“ technology for subsurface remediation of groundwater contaminated with volatile organic compounds(VOCs) such as 1,1, l-trichloroethane(TCA), a common chlorinated organic solvent, has hmitation of prohibitively long treatment time due to extremely low water solubility of the VOCs. Surfactant-based soil remediation has emerged as the effective technology that substantially reduces the treatment time. In order to make the whole process economical, the surfactant used in soil washing has to be recovered and reused. This study examined the recovery of anionic surfactant, sodium dodecyl sulfate( SDS), from soil remediation fluids containing TCA, using a bench-scale membrane pervaporation unit. The effects of high TCA concentration, surfactant dosage, and flow rate on permeationflux and selectivity( a value) of the process were evaluated. In general, higher surfactant concentration yielded lower TCA flux and constantwater flux, resulting in declining a values; higher flow rate of TCA feed stream results in higher VOC flux and selectivity, an indication of the effect of concentration polarization; higher TCA feed concentration produces higher TCA permeation across the membrane, however, the seletlvity was virtually unchanged unless the total TCA concentratinn exceeded 2000 ppm. 相似文献
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水中微量有机物氯化物脱除复合膜的研制 总被引:1,自引:0,他引:1
采用溶液聚合法合成了丙烯酸及丙烯酸酯共聚物,并利用该共聚物可与环氧树脂交联的作用制备出交联聚丙烯酸及基酯的共聚物,并在聚砚底膜上涂膜形成可优先透过氯化有机物(THMs)的复合膜,以1,1,2-三氯乙烷,三氯乙烯等稀水溶液对丙烯酸酯系列复合膜进行了系统测试和研究,分别考察了不同制膜液、交联剂、操作压力、操作温度、进料液浓度、不同分离体系等条件对膜性能的影响,并优选出交联AB-AA-MAA/PS复合膜,表明效果良好,有很好的研究和发展前景。 相似文献
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Sean LIU 《环境科学学报(英文版)》2003,(6)
IntroductionRapidindustrializationofthelastcenturybroughtwithhugeenvironmentalcosts:vastquantitiesoforganicsolventsweredisposedofintheoceans ,rivers lakes,andmorelikelyinthesoil(Hunter,2 0 0 0 ) .Amongallorganicsolventsthatcontaminatesoilandconsequently,thegroundwater,isagroupofchlorinatedorganicsolventsthatareparticularlyproblematic(Love ,1 982 ) .Thesesolventshaveverylowwatersolubility,lowbiodegradability,andhigherdensitythanthatofwater.Asaresult,thesesolventssettlethroughthewatertableuntil… 相似文献
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