冬季におけるマイクロバブルによる池の浄化の実証試験

摘要

Microbubble technique is applied to water quality purification of a pond having water amount of 5,000 tons. Microbubble water jets are injected into the bottom layer through 16 nozzles at total flow rate of 250 L/min, and air is self-supplied into the throats of each nozzle from the water surface. The aim of this study is to confirm the effect of microbubbles on the water quality purification of the pond using the simple microbubble generator system and obtain the objective and continuing data of some water quality indicators. As a result, dissolved oxygen concentration and transparency were improved, although the demonstration test had been conducted during the winter season.%環境省の報告"によれば，平成27年度の河川のBOD (生 物化学的酸素要求量）に関しては93.9 %が環境基準を満た しているが，湖沼のCOD (化学的酸素要求量）においては 55.6 %しか環境基準を満たしていない.湖沼の水質浄化が 進まない理由としては，湖沼が閉鎖性水域であるため，水 の流出入が行われず，汚濁物質が蓄積しやすいためである とされている.