Effect of bubble characteristics and nozzle size on the membrane distillation enhanced by gas–liquid two-phase flow
| Autor: | Dashuai Zhang, Xiaopeng Zhang, Li Chen, Wang Lili, Wu Di, Yuqin Xiong, Qiang Lin, Zaifeng Shi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Journal of Water Reuse and Desalination, Vol 9, Iss 3, Pp 292-300 (2019) |
| Druh dokumentu: | article |
| ISSN: | 2220-1319 2408-9370 |
| DOI: | 10.2166/wrd.2019.075 |
| Popis: | 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). |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|