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Influence of bubble size and relative humidity on bubbling-enhanced membrane distillation

Authors： XIONG Yuqin, ZHOU Fan, GAO Fei, SHI Zaifeng*, LIN Qiang

Units： College of Chemistry &chemical engineering, Hainan Normal University, Haikou, 571158, China

KeyWords： gas-liquid two-phase flow; bubble size; bubble humidity; bubbling-enhanced

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2016,36(2):65-69

Abstract：

Gas-liquid two-phase flow technology was employed to reinforce SGMD process with high-concentrated NaCl solution. The impacts of continuous & intermittent bubble method, bubble size/relative humidity on bubbling-enhanced SGMD process performance were employed. Meanwhile, the comparative study of SGMD process with intermittent bubble and no bubble was carried out. It turned out that intermittent bubble was better than continuous bubble for optimization of MD process; permeate flux increased with the increase of bubble relative humidity and the decrease of bubble size. When feed was saturated NaCl solution (333 K), bubbling on-off set was 30 s/3 min, bubble flown rate/relative humidity/size were 0.7 L•min-1, 75%, 0.22 cm respectively, permeate flux reached to 2.94 L•m-2•h-1. Relative to no bubble, intermittent bubble can delay the appearance of flux sharp flux decline in SGMD process, and NaCl deposition adherent to membrane surface have verified the above result. Moreover, thermal efficiency was improved by 79.52%.

Funds：

海南省科技兴海专项项目（XH201421)；海南师范大学2015年度“大学生创新创业训练计划"项目(cxcyxj2015019)

AuthorIntro：

熊玉琴（1988-），女，邵阳市人，硕士研究生，研究方向为膜蒸蒸馏海水淡化与污水处理, E-mail：1240948944@qq.com

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