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http://dx.doi.org/10.11001/jksww.2021.35.6.379

A study on possibility of using CST as a fouling evaluation index at MBR  

Kim, Yun-Ji (Department of Applied Environmental Science, Kyung Hee University)
Choi, Yun-Jeong (Department of Applied Environmental Science, Kyung Hee University)
Sim, Tae-Suk (Department of Applied Environmental Science, Kyung Hee University)
Hwang, Sun-Jin (Department of Applied Environmental Science, Kyung Hee University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.35, no.6, 2021 , pp. 379-387 More about this Journal
Abstract
In general, trans-membrane pressure (TMP), flux, filtration resistance are used as indicators to evaluate the degree of fouling in MBR. However, they have limitations in determining the level of EPS generation, which is known as an important factor of fouling. Therefore, a new evaluation method is required to monitor the amount of EPS generation. In this study, the applicability of capillary suction time (CST), which is used to measure the dewaterability of sludge, was evaluated as an indirect fouling evaluation index. Statistical analysis was performed to evaluate the effect of EPS on CST, and to determine whether EPS has high similarity with representative fouling evaluation indicators and CST, and quantitatively compared them. As a result, the correlation coefficient between CST and bEPS was 0.7988, which was higher than the correlation coefficient between filtration resistance and bEPS. Since bEPS is a major factor inducing fouling by affecting the formation of the cake layer, it was evaluated that CST, which has a high correlation with bEPS, is suitable to represent EPS. In addition, it was evaluated that the correlation coefficient between filtration resistance and CST was high as 0.7187, which could be used as a fouling evaluation index.
Keywords
MBR; Fouling; CST; EPS; Correlation analysis;
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