浸没式超滤海水预处理工艺
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2020-03-16 10:22:09
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2015年第34卷第1O期化工进展CHEMICALINDUSTRYANDENGINEERINGPROGRESS·3795·浸没式超滤海水预处理工艺李晓伟,解利昕,孙晨,孙磊,戴海平(天津大学化工学院,天津市膜科学与海水淡化技术重点实验室,天津300072;天津膜天膜科技股份有限公司,天津300042)摘要:目前渤海湾反渗透海水淡化工程多采用新型的超滤膜法预处理工艺,为提高预处理效果,主要进行超滤膜材料和性能改进以及膜组件运行参数的优化,而对超滤膜前预处理的研究相对较少。本实验研究了超滤与混凝/超滤作为反渗透海水淡化预处理工艺的处理效果。考察了两种预处理工艺条件下浸没式超滤膜比通量(SF)、进水水质、产水水质,膜孔孔径变化、反洗效果及膜表面污染情况。结果表明,超滤与混凝/超滤两种预处理工艺都能达到产水SDI<2.0;混凝处理可以大幅度降低海水中颗粒数目,降低颗粒物在膜表面沉积和吸附的概率,减轻超滤膜的污染。当采用混凝/超滤工艺时超滤膜表面滤饼层疏松多孔,膜孔孔径变化较小,超滤膜比通量的衰减速度减缓,反洗时超滤膜比通量恢复率较高。关键词:渤海湾;预处理;超滤;混凝;污染中图分类号:P747+.5文献标志码:A文章编号:1000—6613(2015)10—3795—05DoI:10.16085~.issn.1000—6613.2015.10.042SeawaterpretreatmentwithsubmergedultrafiltrationLIXiaowei,XIELixin,SUNChen,SUNLei2,DAIHaipinf(SchoolofChemicalEngineeringandTechnology,TianjinUniversity,TianjinKeyLaboratoryofMembraneScienceandDesalinationTechnology,Tianjin300072,China;TianjinMotimoMembraneTechnologyCo.,Ltd.,Tianjin300042,China)Abstract:Theultrafiltration(UF)pretreatmentprocessiSwidelyemployedinreverseosmosisdesalinationprojectatBohaigulf.MostresearchesfoCUSontheimprovementsofUFmembranematerial,performancesandtheoperationoptimizationofmembranemodule.ButthepretreatmentofUFiSnotwidelystudied.Thisexperimentstudiedtheeffectsofpretreatmenttoseawaterbydirectultrafiltrationprocessandeoagulation/UFprocess.ThesubmergedUFmembranespecificflow(SF),waterquality,membraneporesizedistribution,therecoveryrateofmembraneSF,andthepollutionofmembranesurfacewereinvestigatedforthesetwotechnologies.Theresultsshowedthatbothprocessescouldachievelessthan2.0SDI15;thecoagulation/UFprocesscouldsignificantlydecreasethenumberofgranulesinseawater,thusreducingtheprobabilityofpollutantsdepositionandadsorptioninmembranesurfaceandimprovingthefoulingextentofUFmembrane.enthecoagulation/UFprocesswasadopted,thecakelayerofmembranesurfacewasmoreporous,thevariationofmembraneporesizedistributionwasinsignificant,theattenuationofUFmembraneSFwasslowed,andtherecoveryrateofUFmembraneSFwasenhanced.Keywords:Bohaigulf;pretreatment;ultrafiltration;coagulation;pollution收稿日期:2015。04.02
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