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DOI : 10.17640/KSWST.2021.29.3.35 ,    Vol.29, No.3, 35 ~ 49, 2021
Title
Operation Characteristics of the Hybrid-type Microbubble Generator using a Pressure Pump and an Air Saturation Tank
김원재 Weon-jae Kim
Abstract
Dissolved air flotation (DAF) process has been applied to the entire environmental fields. The micro-bubble generator, which is a key facility in DAF process, can be classified according to its generation methodology. In Korea, saturator and DAF-pump types are widely utilized. The feature of saturator type is the application of an air saturation tank (AST), and it has a disadvantage in that operation and maintenance are not easy due to relatively complicated facilities. On the other hand, DAF-pump type uses a micro-bubble generating pump (MGP) alone, so the device configuration is very simple, but the ranges of optimal operating conditions are narrow. In this study, a new hybrid-type microbubble generator has been developed by linking a pressure pump and an AST by converging the advantages of the existing saturator and DAF-pump types. As a result of examining the operation characteristics of this microbubble generator including operating pressure, air flow rate, water flow rate, power consumption, A/W ratio (air/water ratio), DO, and particle size distribution, the appropriate operating conditions could be determined as operating pressure of 4.0 - 6.0 kgf/㎠, air flow rate of 4.0 - 5.0 L/min, water flow rate of 57 - 68 L/min, and A/W ratio of 5.9 - 8.7%. The average diameter of the generated microbubbles showed a stable distribution in the range of 25.0 - 26.7 μm. Based on the above results, it could be verified that the novel hybrid-type microbubble generator had excellent performance at a level that can be applied to the field.
Key Words
AST, air saturation tank, A, W ratio, air, water ratio, DAF, dissolved air flotation, DAF-pump, Hybrid-type microbubble generator, Microbubble size distribution, 공기포화탱크, 공기, 물비, 용존공기부상공정, DAF펌프, 하이브리드형 미세기포 발생장치, 미세기포 입경분포
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