膜科学与技术

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Discuss About Membrane Distillation For Application

Authors： LU, Xiaolong

Units： State Key Laboratory of Hollow Fiber Membrane Materials and Membrane Process, Institute of Biological and Chemical Engineering, Tianjin Polytechnic University

KeyWords： membrane distillation; hydrophobic membrane structure; reclamation of vaporization heat; desiccation of hydrophobic membrane

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2011,31(3):96-100

Abstract：

In this paper, the characteristics of hydrophobic membranes used in membrane distillation (MD) and some realistic problems exist in MD process were discussed. MD process is a heat transfer controlled process. The research in heat transfer and reclamation in MD is of great importance for promoting the technique into real application. There’s no phase inversion heat loss in osmotic membrane distillation and the micro-pores is the channels for mass transfer and the matrix of hydrophobic membranes worked as heat transfer medium. A novel bubbling membrane distillation (BMD) process was designed and used in the continuous concentration experiment of reverse osmosis drained wastewater. No flux declination was observed during the concentration experiment even when the 0.6ton wastewater was concentrated to near saturation by the membrane module of 0.5m2, and no obvious membrane fouling and scaling was found in SEM pictures of the membranes used in BMD.Water film resistance (WFR), the resistance for gas to transfer the hydrophobic membrane/solution interfacial tension, was discovered in our work. Systemic research showed that, effects including the membrane material characteristic, the surface morphology and gas transfer orientation could through light on WFR. The specially designed abnormity hydrophobic tube membranes illustrated excellent mechanical strength comparing to traditional hollow fiber ones. Vacuum membrane distillation (VMD) was coupled with a heat pump system, for the reclamation and reuse of the phase inversion heat of the vapor produced in VMD process. The coefficient of performance of the heat pump is relative to the velocities of the solutions in the evaporator and condenser and the product flux of VMD process.

Funds：

863课题工业循环冷却水膜集成净化过程研究（2008AA06Z303）；天津市重点基金课题废水浓缩减排与淡化再利用技术研究（09JCZDJC26300）

AuthorIntro：

吕晓龙（1964.2— ），男，山西省忻州市人，博士，博士生导师，从事中空纤维分离膜制备与膜分离过程研究.

Reference：

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[5] M. Celere, C. Gostoli, The heat and mass transfer phenomena in osmotic membrane distillation [J], Desalination 147 (2002) 133-138.

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