卤水处理纳滤膜的制备及其在工程化应用中的研究

Preparation of nanofiltration membrane for brine treatment and application in engineering

通过在膜制备过程中引入两性离子N-乙基胺哌嗪丙基磺酸盐(AEPPS)制备高性能卤水处理纳滤膜。当AEPPS添加量为0.3%时,纳滤膜对Mg SO_(4)脱除率达到99.79%,通量为40.13 L/(m^(2)·h),CaCl_(2)脱除率为88.68%,通量为42.12L/(m^(2)·h),综合性能最佳。卤水处理工程化应用结果表明,所制备纳滤膜对Ca^(2+)、Mg^(2+)脱除率分别达到84%、95%,同比优于国外竞品膜的75%、92%,两者系统产水量相当,在同类行业中具有明显的技术和成本优势。

High performance nanofiltration membranes for brine treatment are prepared by adding ethyl aminopiperazine propyl sulfonate(AEPPS),a kind of zwitterionic,in aqueous solution during the preparation of membranes.As the addition of AEPPS is 0.3%,the membrane can remove 99.79%of Mg SO4 with a flux of 40.13 L·m^(-2)·h^(-1),and remove 88.68%of Ca Cl_(2)with a flux of 42.12 L·m^(-2)·h^(-1).As the prepared nanofiltration membranes are applied in actual brine treatment systems,the removal rates of Ca^(2+)and Mg^(2+)reach 84%and 95%,respectively,compared with 75%and 92%by the imported membranes.Moreover,the system using the prepared membranes presents a similar permeation flux with that using the imported membranes,showing significant competitive advantages in the case of technology application and operation cost.