膜科学与技术

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Preparation of PVA-PAA/PTFE composite membrane and it’s application in concentrating landfill leachate during MD

Authors： LI Zhixia, XIE Songchen, JIN Dunshang, SONG Xvfeng,PENG Yuelian

Units： Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China

KeyWords： Janus composite membrane; DCMD; anti-fouling; landfill leachate

ClassificationCode：TQ 028

year,volume(issue):pagination： 2022,42(4):96-104

Abstract：

Membrane distillation (MD) is expected to play a role in the concentration of brine due to little influence by concentration polarization, but it faces the problems of membrane fouling and wetting in actual operation. In this study, a Janus composite membrane was prepared by spin coating a hydrophilic skin layer on a commercial hydrophobic polytetrafluoroethylene (PTFE) membrane. The skin layer was made of polyvinyl alcohol (PVA) and polyacrylic acid (PAA) through high-temperature dehydration condensation. It was stable in hot water and had good anti-fouling ability. The Janus composite membrane had asymmetric wettability. The coating was hydrophilic in the air, water contact angle was 59.1° and oil repellent underwater. The organic fouling and inorganic scaling processes were investigated using 500 mg/L humic acid (HA), 14.7 mM calcium sulfate (CaSO4), and sodium chloride (NaCl) as feed solutions. The Janus membrane was used in concentrating actual landfill. When the concentration factor was three, a stable flux of 17.6 kg/m2·h, and the permeate conductivity of 3 μS/cm could be got, indicating that the prepared Janus composite membrane had application potential in the process of landfill leachate treatment.

Funds：

国家自然科学基金项目（21878005）

AuthorIntro：

李志霞（1995-），女，内蒙古乌兰察布人，硕士研究生，主要从事膜材料改性和膜制备研究

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