earticle

영어

This studies are to investigate of the oxygen transfer efficiency for oxygen dissolver and to evaluate of aerobic liquid-composting system. We design a new kind of high efficiency oxygen dissolver(HEOD) system. Test result of this system, Saturated DO concentration was showed that the fit condition was at 1.0 L/min2 pressurized oxygen pressure and at 0.6 kg/cm2 in pressurized water, respectively. Mass transfer of oxygen in HEOD system, the highest dissolved
oxygen concentration is as high as 56.0 mg/L in comparison of only air supply condition and pure oxygen dissolving on the system, DO dissolving level was higher about 34 mg/L in condition of oxygen supply than the air supply. The capture of bubble images was automated by commercial image analyser. The average bubble size in diameter showed that the air injection was 275 ㎛ and oxygen was 28 ㎛, respectively. And the surface area of bubble estimated that the
air injection was about 21.8 m2 and oxygen was about 214.3 m2, respectively. In this result, the system efficiency in condition of pure oxygen supply was higher than the air supply, so it inquired further into liquid-composting using by oxygen dissolver.