Journal
DESALINATION
Volume 333, Issue 1, Pages 126-133Publisher
ELSEVIER
DOI: 10.1016/j.desal.2013.11.029
Keywords
Coagulation; Bubbling; Ultrafiltration; Hybrid process; Floc properties
Categories
Funding
- Litree Purifying Technology Co., Ltd.
- National Natural Science Foundation of China [51278317]
Ask authors/readers for more resources
A novel hybrid process of coagulation-bubbling-ultrafiltration was proposed to study membrane fouling phenomena by surface water. Relationship of bubbles, flocs and the hollow fibers was explored. When applying less than 20 mL/min gas flow rate, membrane fouling was accelerated with air bubbles introduced. When gas flow rate increased further to 40 mL/min and 60 mL/min, TMP showed a two-stage development trend, which was a fast development in the first few hours followed with a relatively slow development after about 4 h. Unified membrane fouling index (UMFI) increased from 0.00216 (without bubbles) to 0.00274 m(2)/L (40 mL/min gas flow rate) and 0.00219 m(2)/L (60 mL/min gas flow rate). As gas flow rate increased, bubble size became bigger, and its distribution range became wider, resulting in higher shear rate in the ultrafiltration column, which led to severe floc breakage. Flocs of small size and compact structure accelerated membrane fouling, resulting in highest UMFI value under 40 mL/min gas flow rate. However, under 60 mL/min gas flow rate, with largest bubbles and highest shear rate examined in this study, concentration polarization was effectively limited. As a result, TMP development slowed down when pore blockage reached equilibrium. (C) 2013 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available