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Elevated nanofiltration performance via mussel-inspired co-deposition for sustainable resource extraction from landfill leachate concentrate
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.cej.2020.124200
Wenyuan Ye , Riri Liu , Fang Lin , Kunfeng Ye , Jiuyang Lin , Shuaifei Zhao , Bart Van der Bruggen

During the disposal of highly saline wastewaters, i.e., landfill leachate concentrate, a conceptual and paradigmatic transformation from contaminant elimination to sustainable resource extraction urges for novel selective membranes. Mussel-inspired modification through dopamine self-polymerization can be a competitive alternative to tailor the membrane surface properties for enhanced permselectivity to target compounds. Herein, co-deposition of polydopamine-polyethylenimine (PEI) complex onto loose nanofiltration (NF) membranes was conducted using persulfate as trigger, which resulted in a significant alteration in membrane surface properties. Particularly, the pore size of bio-inspired NF membranes decreased, along with a reduction in molecular weight cut-off (MWCO) from 640 to 298 Da after 120-min bio-inspired coating, which yielded an enhancement in rejection of humic substances from 95.1% to 98.9% in filtration of landfill leachate concentrate. Furthermore, the charge of membrane surface was tailored to be more positive due to incorporation of positively-charged PEI, which markedly undermined the electrostatic repulsion force for enhanced salt permeation. These bio-inspired NF membranes showed a superior selectivity between humic substances and salts for their potential fractionation from the landfill leachate concentrate. Through an integrated NF-based diafiltration procedure, the concentration of humic substances was remarkably enriched from 1779.4 to 17247.1 mg·L-1 with 96.0% recovery. Additionally, 99.5% desalination efficiency was achieved, resulting in a high purity (i.e., 98.3%) for humic substances as potential organic fertilizer application. These findings suggest that the bio-inspired co-deposition is an effective strategy to tailor the surface properties of NF membranes for efficient fractionation of humic substances and salts, in view of sustainable resource recovery from the landfill leachate concentrate.



中文翻译:

通过贻贝启发式共沉积提高了纳滤性能,可从垃圾渗滤液浓缩物中可持续提取资源

在处理含盐量高的废水(即垃圾渗滤液浓缩物)时,从污染物消除到可持续资源提取的概念和范式转换催生了新型选择性膜。通过多巴胺自聚合进行的贻贝启发式修饰可以成为竞争性替代方案,以定制膜表面特性,以增强对目标化合物的渗透选择性。在本文中,使用过硫酸盐作为引发剂将聚多巴胺-聚乙烯亚胺(PEI)复合物共沉积到松散的纳滤(NF)膜上,这会导致膜表面性能发生重大变化。特别是,受到生物启发的NF膜的孔径减小,并且经过120分钟的生物启发涂层后,分子量截留值(MWCO)从640降至298 Da,在过滤垃圾渗滤液浓缩物中,腐殖质的截留率从95.1%提高到98.9%。此外,由于引入了带正电的PEI,膜表面的电荷被调整为更正,这明显削弱了静电排斥力,从而增强了盐的渗透性。这些生物启发的NF膜对腐殖质和盐之间的潜在选择性显示出极好的选择性,因为它们可以从垃圾渗滤液浓缩物中进行分馏。通过基于NF的综合渗滤程序,腐殖质的浓度从1779.4显着富集到17247.1 mg·L 由于引入了带正电的PEI,膜表面的电荷被调整为更正,这明显削弱了静电排斥力,从而增强了盐的渗透性。这些生物启发的NF膜对腐殖质和盐之间的潜在选择性显示出极好的选择性,因为它们可以从垃圾渗滤液浓缩物中进行分馏。通过基于NF的综合渗滤程序,腐殖质的浓度从1779.4显着富集到17247.1 mg·L 由于引入了带正电的PEI,膜表面的电荷被调整为更正,这明显削弱了静电排斥力,从而增强了盐的渗透性。这些生物启发的NF膜对腐殖质和盐之间的潜在选择性显示出极好的选择性,因为它们可以从垃圾渗滤液浓缩物中分馏出来。通过基于NF的综合渗滤程序,腐殖质的浓度从1779.4显着富集到17247.1 mg·L-1,回收率96.0%。另外,实现了99.5%的脱盐效率,导致腐殖质作为潜在的有机肥料的应用具有很高的纯度(即98.3%)。这些发现表明,考虑到从垃圾渗滤液浓缩物中的可持续资源回收,生物启发性共沉积是一种有效的策略,可定制NF膜的表面特性,以有效分离腐殖质和盐。

更新日期:2020-01-23
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