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This invention relates to a method of cleaning up liquids such as waste water, sewage and other industrial liquid wastes.
2. Brief Description of the Prior Art
The conventional methods of cleaning up industrial liquid wastes include the following two methods.
The first method is called "pond system". In this method, the waste liquid is directly discharged into a pond (reservoir) maintained in the open air or is directly sprayed into the air to dissipate the liquid waste. Since, in this method, the liquid waste is directly discharged into the atmosphere, the liquid waste is decomposed very slowly, and the amount of liquid waste that can be treated is limited to a very small quantity per day.
The second method is called "closed treatment system". In this method, the waste liquid is treated by various methods such as aeration, treatment with enzymes and biological action. In this method, the waste liquid is treated in a closed system. However, this method is difficult to control the treatment effect because of variations in the environmental conditions such as temperature, light and so on.
In view of the above, there is a demand for a treatment method that can treat a large amount of waste liquid quickly and efficiently.
Hitherto, techniques for cleaning up waste water by the method of water flotation are disclosed in U.S. Pat. No. 3,697,220 and JP-A-Sho-63-289946. The former patent is directed to a waste water flotation method, in which waste water is treated by use of an additive such as a calcium sulfate hemihydrate, 0b46394aab