Water Quality Research of Busan Water Authority

Kimhae, South Korea

Water Quality Research of Busan Water Authority

Kimhae, South Korea

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Cho Y.,Water Quality Research of Busan Water Authority | Yoo S.,Water Quality Research of Busan Water Authority | Hwang Y.,Water Quality Research of Busan Water Authority | Roh J.,Water Quality Research of Busan Water Authority | And 2 more authors.
Korean Journal of Chemical Engineering | Year: 2010

In Korea, the party walls of the flocculation basin consist generally of four parts, as three party walls and the outlet wall. The space between the third party wall and the outlet wall is therefore not the full extent of the flocculation basin and sedimentation basin. This space is theoretically totally unfounded. In order to practically apply the third party wall as an outlet wall, the volume capacity of the last third flocculation process needs to be determined on the ground that the perforated baffle (opening ratio 6%) is not ideal for the rectification effect. The buffer zone, according to the G value, is required in the last third flocculation process for a uniform flow at the outlet. Therefore, the objective of this study was to determine the size of the buffer zone in the last third flocculation process using CFD. Conclusions are made as follows: The difference of outflow rate percentage between the upper, middle and bottom part sections reduces according to the expansion of the third basin volume from 4.2 to 7.7 at each G value. We can suggest that the effluent percentage at the three sections is less affected by the G value than by the volume increase. For G values ranging from 11 to 16(1/s), the buffer zone needs to range from 10% to 20% compared with the last third volume by the velocity of standard deviation of 5 at the outlet. Also, when the velocity of standard deviation at the outlet is 2.5 or less, the buffer zone needs to range from 45% to 55%. © 2010 Korean Institute of Chemical Engineers, Seoul, Korea.


Cho Y.,Water Quality Research of Busan Water Authority | Yoo S.,Water Quality Research of Busan Water Authority | Yoo P.,Water Quality Research of Busan Water Authority | Kim C.,Pusan National University
Korean Journal of Chemical Engineering | Year: 2010

This study on the party wall of a flocculation basin provides important ground to facilitate the inducement of uniformity in the rectangular sedimentation basin and to achieve an improvement in sedimentation efficiency. In the water treatment plant used for this study, perforated baffle type, square type, pillar type and downward rectangular type partitions have been applied. We evaluated the hydrodynamic behavior of several types of party walls in the flocculation basin by using computational fluid dynamics (CFD). The perforated baffle type demonstrates more effective output for uniform flow than the square type, and the third party wall of the flocculation process has the most influence of the three party walls for water flow distribution. To prevent sinking of the flocs formed between the third party wall and the final outlet wall, it is necessary to develop the third party wall into an actual final outlet wall or to modify it into a pillar baffle type. In the case of a drinking water treatment system that treats low density water, a perforated baffle is more efficient as the final outlet wall because a downward rectangular type may form a bottom flow, which may cause a reduction in the efficiency of the volume capacity. © 2010 Korean Institute of Chemical Engineers, Seoul, Korea.

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