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Preparation and Application of Hollow Fiber Ultrafiltration Membrane for Desalination of High Salt Concentration Dyeing Wastewater

Authors： Xiuzhen Wei,Ruiyuan Yang, Jinyuan Chen, Cuixia Li, Bosheng Lv

Units： College of Environment, Zhejiang University of Technology,Hangzhou 310014

KeyWords： polysulfone, sulfonated polyethersulfone, blending modification, high salt dyeing wastewater

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(2):96-103

Abstract：

Hydrophilic sulfonic acid group (-SO3H) was introduced into polysulfone (PSf) bulk solution by adding sulfonated polyethersulfone (SPES) into PSf casting solution, and blend modified PSf/SPES ultrafiltration (UF) membrane were prepared by non-solvent induced phase separation (NIPS) method. The morphology and structure of the membrane were characterized by scanning electron microscope (SEM), and the separation performance of UF membrane was studied by filtration experiments. The optimal addition amount of SPES is 0.25 wt%, and the core fluid composition (DMAc: H2O) is 2:8. At this time,the pure water flux is 282.5 L/(m2·h), and the rejection rates of the modified membrane for 100 mg/L reactive brilliant orange KE-2R, reactive dark blue KE-R and direct blended yellow D-3RNL are 95.6%, 94.7%, and 97.4%, respectively under 0.1 MPa. PSf/SPES modified membrane can reject over 60% Reactive Brilliant Red X-7B and penetrate most of Na2SO4 even if the concentration of Na2SO4 was as high as 100 g/L. Thus, the dye molecules and salt molecules in the high-salt dyeing wastewater can be separated and purified. In addition, the permeation flux and rejection rate of the modified membrane changed a little during the modified membrane was used to treat dyeing wastewater for 48 hours continuously indicating the modified membrane has good operational stability and can be applied to actual dyeing wastewater treatment.

Funds：

浙江省自然科学基金（LY19E030005）

AuthorIntro：

杨瑞元（1996-），男，浙江金华人，硕士生，从事聚砜膜的制备、改性和应用研究，E-mail：1822723985@qq.com.

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