Abstract-This study is aiming at finding an efficient method to purify deep water in Midorikawa-dam Lake in Kumamoto Pref., Japan. The biological oxygen demand (BOD) of the water at first was 46 mg/L in the worst case. In the test, micro-bubbles were periodically supplied into the water in 80 L tank by a multi-fluids-mixer patented by Sadatomi and Kawahara. The bubbling rate were changed as Q G = 1.0 L/min and 2.0 L/min to study its effect. In addition, the Eco-Bio-Ring including aerobic bacteria (Bacillus bacterium), sold by Big Bio Co. Ltd., Japan, were immersed in two tanks of the three in order to study its effect. As a result, it was cleared that Q G = 1.0 L/min was enough to reduce the BOD to about 6-10 mg/L within two weeks, and the Eco-Bio-Ring was effective to reduce turbidity.Index Terms-Aerobic bacteria, lake, micro-bubble, water purification.
The purpose of this study is to find an efficient method to purify deep water in lake of the Midorikawa dam in Kumamoto , The biochemical oxygen demand ( BOD )of the water at first was 46 mg1L in the worst case . In the test , 皿 icrobubbles were periodically supplied into the water in 80 L test tank by a multi −fluids − mixer patented by Sadatomi and Kawahara . The aeration rate were set as gc = 1, 0 L! min or 2, 0 L! min to study its effects, In addition , a water
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