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- Title
Effect of aeration on CaSO<sub>4</sub> scaling in membrane distillation process.
- Authors
Jihyeok Choi; Yongjun Choi; Yongsun Jang; Yonghyun Shin; Sangho Lee
- Abstract
Although membrane distillation (MD) can treat high-salinity feedwater such as reverse osmosis (RO) brine and produced water, the control of fouling resulted from scale formation is mandatory in such applications. As one of the attempts to alleviate fouling and scaling, this study applied an in-line air injection into the feed inlet of the membrane module in MD systems. Experiments were carried out in a bench-scale direct contact membrane distillation systems using a saturated CaSO4 solution as the model feedwater. It was revealed that the air injection was effective to retard flux decline due to CaSO4 scale formation. As the air flow rate and feed flow velocity increased, the flux reduction volume concentration factor increased from 1.17 to a maximum of 1.27. The critical concentration factor (CCF) that is defined as the concentration factor of rapid flux decline increased by the aeration. Since the MD fouling due to scale formation was attributed to the bulk crystallization, it is likely that the aeration can control the deposition of crystal particles on the membrane surface. In addition, the feed flow velocity was found to be an important factor affecting the effectiveness of aeration for MD scale control.
- Subjects
MEMBRANE distillation; WATER aeration; FLOW velocity; REVERSE osmosis; AIR flow; OIL field brines
- Publication
Desalination & Water Treatment, 2017, Vol 90, p7
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2017.21349