Effect of bubble characteristics and nozzle size on the membrane distillation enhanced by gas–liquid two-phase flow

Dashuai Zhang; Xiaopeng Zhang; Li Chen; Wang Lili; Wu Di; Yuqin Xiong; Qiang Lin; Zaifeng Shi

doi:10.2166/wrd.2019.075

Journal of Water Reuse and Desalination (Sep 2019)

Effect of bubble characteristics and nozzle size on the membrane distillation enhanced by gas–liquid two-phase flow

Dashuai Zhang,
Xiaopeng Zhang,
Li Chen,
Wang Lili,
Wu Di,
Yuqin Xiong,
Qiang Lin,
Zaifeng Shi

Affiliations

Dashuai Zhang: Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Hainan Normal University, Haikou, Hainan 571158, China and College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan 571158, China
Xiaopeng Zhang: Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Hainan Normal University, Haikou, Hainan 571158, China and College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan 571158, China
Li Chen: Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Hainan Normal University, Haikou, Hainan 571158, China and College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan 571158, China
Wang Lili: Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Hainan Normal University, Haikou, Hainan 571158, China and College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan 571158, China
Wu Di: Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Hainan Normal University, Haikou, Hainan 571158, China and College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan 571158, China
Yuqin Xiong: Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Hainan Normal University, Haikou, Hainan 571158, China and College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan 571158, China
Qiang Lin: Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Hainan Normal University, Haikou, Hainan 571158, China and College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan 571158, China
Zaifeng Shi: Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Hainan Normal University, Haikou, Hainan 571158, China and College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan 571158, China

DOI: https://doi.org/10.2166/wrd.2019.075
Journal volume & issue: Vol. 9, no. 3
pp. 292 – 300

Abstract

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This study investigates the membrane performance and fouling control in bubble-assisted sweeping gas membrane distillation with high concentration saline (333 K saturated solution) as feed. The results show that a longer bubbling interval (3 min) at a fixed bubbling duration of 30 s can most efficiently increase the flux enhancement ratio up to 1.518. Next, the flux increases with the gas flow rate under a relatively lower level, but tends to plateau after the threshold level (1.2 L·min−1). Compared to the non-bubbling case, the permeate flux reaches up to 1.623-fold at a higher bubble relative humidity of 80%. It was also found that greater flux enhancement can be achieved and, meanwhile, dramatic flux decline can be delayed for an intermittent bubbling system with a smaller nozzle size. These results accord well with the observations of fouling deposition in situ on the membrane surface with scanning electron microscope (SEM).

Published in Journal of Water Reuse and Desalination

ISSN: 2220-1319 (Print); 2408-9370 (Online)
Publisher: IWA Publishing
Country of publisher: United Kingdom
LCC subjects: Technology: Environmental technology. Sanitary engineering: Water supply for domestic and industrial purposes
Website: https://iwaponline.com/jwrd

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