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DOI : ,    Vol.6, No.2, 19 ~ 30, 1998
Title
A Study on the Measurement of Activated Sludge Floc Density by the Development of Flocculation Processes in Advanced Water Treatment
정호진Ho Jin Chung
Abstract
Flocculation is one of the important processes in water and wastewater treatment. The physical properties of flocs such as size and density are significant factors influencing solid-liquid separation processes. During flocculation, floc size and density can be changed depending on physical conditions. In this study, by developing new optical technique, we measure flocculation process in on-line manner to understand the flocculation phenomena in more detail. We also seek to improve the efficiency in advanced water treatment by studying the properties of bioflocs produced in activated sludge processes. The obtained results are as follows: It is found that the log-log graph of turbidity(τ) against specific turbidity(τ/φ) shows a straight line with the slope 2(m-1) or 2(2-D)/D. In this case, if we use fractal dimension(D), it is possible to interpret the structure of aggregates in three dimension. Because it is also possible to investigate the flocculation phenomena depending on various conditions, we can control the flocculation process more effectively in advanced water treatment applications. It is also found that bioflocs are shown as large and loose. If we analyse the efficiency of biological treatment by the structure of aggregates, better efficiency are obtained by increasing Hydraulic Retention Time(HRT). Although more work must be put on this, if we define structural properties of flocs in on-line manner, it is possible to investigate the flocculation processes more effectively.
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