To lower the operational cost of microbubble generation by electrolysis, optimization of parameters limiting the process must be carried out for the process to be fully adopted in environmental and industrial settings. In this study, four test electrodes were used namely aluminum, iron, stainless steel, and Dimensionally Sable Anode (DSA). We identified the effects and optimized each operational parameter including NaCl concentration, current density, pH, and electrode distance to reduce the operational cost of microbubble generation. The experimental results showed that was directly related to the rate and cost of microbubble generation. Adding NaCl and narrowing the distance between electrodes caused no substantial changes to the generation rate but greatly decreased the power requirement of the process, thus reducing operational cost. Moreover, comparison among the four electrodes operating under optimum conditions revealed that aluminum was the most efficient electrode in terms of generation rate and operational cost. This study therefore presents significant data on performing costefficient microbubble generation, which can be used in various environmental and industrial applications.

Abstract
 1. Introduction
 2. Experimental
  2.1. Electrode materials
  2.2. Experimental Set-up
  2.3. Microbubble generation analyses
 3. Results and Discussion
  3.1. Effect of NaCl concentration
  3.2. Effect of current density
  3.3. Effect of pH
  3.4. Effect of electrode distance
  3.5. Selection of optimum parameters
  3.6. Comparison among electrode materials
 4. Conclusions
 REFERENCES

• Arpon Lucero Jr(Department of Environmental Science, Catholic University of Daegu)
• Dong-Seog Kim(Department of Environmental Science, Catholic University of Daegu)
• Young-Seek Park(DU University College, Daegu University) Corresponding author