Abstract
A new water purification technique in closed water area polluted by muddy and waste water was developed by use of the aerators which can generate a large quantity of micro bubble, which diameter is less than 100μm, and form large-scale circulating flow in the whole water area.
The efficiency of the new technique was experimentally proved for the several kinds of waste water quality in laboratory and fields. The results indicate that the both of turbidity and concentration of suspended solid in the waste water of a pond were decreased by about 90% in 668 hours.
