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http://dx.doi.org/10.17640/KSWST.2018.26.6.99

Development of Steam Cleaning Technique to Improve Removal Efficiency of Membrane Fouling Matter in Water Treatment Process Using Ceramic Membrane  

Kang, Joon-Seok (Department of Environmental Engineering and Energy, Myongji University)
Park, Seo Gyeong (Department of Environmental Engineering and Energy, Myongji University)
Lee, Jeong Eun (Department of Environmental Engineering and Energy, Myongji University)
Kang, So Yeon (Department of Environmental Engineering and Energy, Myongji University)
Lee, Jeong Jun (Department of Environmental Engineering and Energy, Myongji University)
Quyen, Vo Thi Kim (Department of Environmental Engineering and Energy, Myongji University)
Kim, Han-Seung (Department of Environmental Engineering and Energy, Myongji University)
Publication Information
Journal of Korean Society of Water Science and Technology / v.26, no.6, 2018 , pp. 99-107 More about this Journal
Abstract
This research has developed a high temperature steam cleaning technology using a ceramic membrane with durability against temperature and pressure conditions. In steam cleaning, steam of $120^{\circ}C$ is injected into the ceramic membrane to induce pyrolysis by the endothermic reaction to remove fouling from the membrane. The water quality of raw water was adjusted to turbidity 10, 25 NTU and DOC 2.5 mg/L, and the membrane was uniformly fouled by constant pressure operation at 100, 200, and 300 kPa. Physical backwashing was performed with water and air at a pressure of 500 kPa and steam at $120^{\circ}C$ was injected for 0 to 5 minutes. As the turbidity concentration and the operating pressure increased, the flux decreased by 0.7 to 14.4%. It is confirmed that 10.7 to 53.8% recovery is possible than physical cleaning at the injection of steam for 3 minutes, so it is considered that the steam cleaning of the ceramic membrane is effective. Compared with CEB after NaOCl (300 mg/L) filtration at 25 NTU and 300 kPa of turbidity, the steam cleaning result for 3 minutes was similar to 46.7% of CEB for 3 hours. It has been confirmed that steam cleaning is suitable for a ceramic membrane having excellent heat resistance against high temperature. It was considered to have better cleaning efficiency as compared with general physical backwashing.
Keywords
Ceramic membrane; Chemically enhanced backwashing(CEB); Membrane fouling; Microfiltration; Steam cleaning; Water treatment;
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