聚酰胺复合纳滤膜对苦咸水的处理效能研究
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摘要
为了利用我国西北地区的苦咸水资源,满足日益增长的饮用水需求,利用自行制备的典型聚酰胺复合纳滤膜处理西北某地经过混凝+沉淀+石英砂过滤预处理的苦咸水,研究该纳滤过程的处理效能.结果表明,该纳滤膜能有效截留原水中各类无机离子和溶剂性有机物,保证出水满足《生活饮用水卫生标准》(GB5749-2006)对相关指标的要求;综合考虑膜污染速率和溶质截留情况,认为选用0. 5 MPa的跨膜压差是较为合适的;纳滤膜处理该苦咸水时的膜污染为天然有机物的有机污染和无机盐沉淀的无机污染的共同作用.
In order to meet the drinking water standards by using the brackish water as raw water in northwest China,a typical polyamide nanofiltration( NF) membrane has been fabricated and used to treat the brackish water after pretreatment of coagulation + sedimentation+ quartz sand filtration. The results showed that this NF membrane can effectively rejection different ions and dissolved organic matters in the brackish water,which ensured the permeate water could meet the requirements of the Standard for drinking water quality( GB5749-2006). The operation pressure of 0. 5 MPa was proper according to the balance of membrane fouling and solute rejection. The membrane fouling was the combined effect of organic fouling and inorganic fouling,which were induced by natural organic matters and inorganic precipitate,respectively.
In order to meet the drinking water standards by using the brackish water as raw water in northwest China,a typical polyamide nanofiltration( NF) membrane has been fabricated and used to treat the brackish water after pretreatment of coagulation + sedimentation+ quartz sand filtration. The results showed that this NF membrane can effectively rejection different ions and dissolved organic matters in the brackish water,which ensured the permeate water could meet the requirements of the Standard for drinking water quality( GB5749-2006). The operation pressure of 0. 5 MPa was proper according to the balance of membrane fouling and solute rejection. The membrane fouling was the combined effect of organic fouling and inorganic fouling,which were induced by natural organic matters and inorganic precipitate,respectively.
引文
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[14] ZHANG R,YU S,SHI W,et al. Support Membrane Pore Blockage(SMPB):An Important Phenomenon during the Fabrication of Thin film Composite Membrane via Interfacial Polymerization[J]. Separation and Purification Technology,2019,215:670-680.
[15] LI Q,ELIMELECH M. Organic fouling and chemical cleaning of nanofiltration membranes:measurements and mechanisms.[J]. Environmental Science&Technology,2004,38(17):4683-4693.
[2]王文正,张鹏,王庚平.纳滤膜技术在甘肃农村安全饮水工程中的应用[J].给水排水,2011(s1):28-30.
[3]高从堦,陈益棠.纳滤膜及其应用[J].中国有色金属学报,2004,14(z1):310-316.
[4]李晓明.海水纳滤软化过程中膜性能演变机制研究[D].青岛:中国海洋大学,2008.
[5]赖特明,方建慧,邓英,等.纳滤膜处理崇明岛苦咸水中试研究[J].盐业与化工,2009,38(2):17-20.
[6]杨庆娟,魏宏斌,王志海,等.纳滤膜去除饮用水中无机离子的中试研究[J].中国给水排水,2009,25(5):52-55.
[7] MOHAMMAD A W,BASHA R K,LEO C P. Nanofiltration of glucose solution containing salts:Effects of membrane characteristics,organic component and salts on retention[J]. Journal of food engineering,2010,97(4):510-518.
[8] LUO J,WAN Y. Effect of highly concentrated salt on retention of organic solutes by nanofiltration polymeric membranes[J].Journal of membrane science,2011,372(1):145-153.
[9] LUO J,WAN Y. Desalination of effluents with highly concentrated salt by nanofiltration:From laboratory to pilot-plant[J].Desalination,2013,315:91-99.
[10] SIMON A,PRICE W E,NGHIEM L D. Effects of chemical cleaning on the nanofiltration of pharmaceutically active compounds(PhACs)[J]. Separation and Purification Technology,2012,88:208-215.
[11] ZHANG R,YU S,SHI W,et al. A novel polyesteramide thin film composite nanofiltration membrane prepared by interfacial polymerization of serinol and trimesoyl chloride(TMC)catalyzed by 4dimethylaminopyridine(DMAP)[J]. Journal of Membrane Science,2017,542:68-80.
[12] CHENG J,SHI W,ZHANG L,et al. A novel polyester composite nanofiltration membrane formed by interfacial polymerization of pentaerythritol(PE)and trimesoyl chloride(TMC)[J]. Applied Surface Science,2017,416:152-159.
[13] CHENG J,ZHANG Z,SHI W,et al. A novel polyester composite nanofiltration membrane prepared by interfacial polymerization catalysed by 4-dimethylaminopyridine:Enhanced the water permeability and anti-fouling ability[J]. Polymer,2018,153:24-32.
[14] ZHANG R,YU S,SHI W,et al. Support Membrane Pore Blockage(SMPB):An Important Phenomenon during the Fabrication of Thin film Composite Membrane via Interfacial Polymerization[J]. Separation and Purification Technology,2019,215:670-680.
[15] LI Q,ELIMELECH M. Organic fouling and chemical cleaning of nanofiltration membranes:measurements and mechanisms.[J]. Environmental Science&Technology,2004,38(17):4683-4693.