Patent ID: 7534351

Claim:
A process of biological cleaning of waste water under pressure wherein, in a biological cleaning method of waste water in which cleaning of waste water is performed biologically by utilizing the biological waste water cleaning function of microorganism bodies by way of an oxidation reaction and/or reduction reaction, comprising: dissolving a reactive gas containing oxygen within 0.5 seconds, in part by means of a line atomizer which generates ultrasonic waves and cavitations forming bubbles with a size of 1 nm to 300 μm under pressure, in advance, and outside of a reaction vessel to be brought into a dissolved state, the remainder being dispersed and stored in the solution as fine bubbles forming a gasified solution; introducing the gasified solution into the reaction vessel so as to feed aerobic microorganisms with the reactive gases; the pressure in the reaction vessel is maintained such that a decreasing concentration of dissolved gas in the gasified liquid in the reaction vessel is maintained; and the microorganism bodies are rendered to exhibit the cleaning function in the reaction vessel.