膜科学与技术

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Structure design and performance study of tubular air gap membrane distillation module

Authors： JI Zhongguang,LI Wei, WANG Haixia

Units： National Engineering Laboratory of Biohydrometallurgy, GRINM Group Corporation Limited. Beijing 101407, China;GRINM Resources and Environment Tech. Co., Ltd. Beijing 101407, China; General Research Institute for Nonferrous Metals. Beijing 100088, China; GRIMAT Engineering Institute Co., Ltd.Beijing 101407,China

KeyWords： Membrane distillation; flux; Mass transfer；Membrane fouling; Wettability

ClassificationCode：X52

year,volume(issue):pagination： 2021,41(2):88-95

Abstract：

Low membrane flux and serious membrane fouling are one of the main reasons that restrict membrane distillation technology to large-scale industrial utilization, the air gap membrane distillation is used as a model to study the mass transfer, which the intermediate air gap layer, condensing tube material, condensation surface area, and liquid inlet and outlet pattern are included in. Then, A new type of tubular membrane distillation was proposed and called as membrane contact membrane distillation (M-DCMD). After that, Potassium chloride solution(1 moL·L-1) was concentrated by membrane contact type(M-DCMD), air gap type(AGMD), direct contact type(DCMD) for comparative study theirs concentration process, membrane fouling and membrane wetting. The results show that the membrane flux increased by 59.8% at 65 ℃ by eliminating the air gap layer. stainless steel condenser tube. The membrane flux of stainless steel condenser tube and copper condenser tube increased by 55% and 56% respectively, compared with PVC condenser tube. Therefore, the membrane flux is significantly affected by the material of the condenser tube. When the ratio of condensation surface area to membrane effective working area increased from 1:1.77 to 1:1.24, the flux of membrane distillation increased by 34.3%. When desalting under the same conditions, the comprehensive properties of M-DCMD such as anti-pollution and anti-wetting are significantly better than AGMD and DCMD.

Funds：

北京市自然科学基金（2182085）&国家重点研发计划(2018YFC1900304)

AuthorIntro：

纪仲光（1982—）,男，河北遵化人，博士，高级工程师，研究方向：膜及膜分离技术在水处理领域应用, E-mail：jizhongguang@grinm.com

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