| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide required effective facilities for running a whole plant by combining a device for producing nitrogen gas and a system for treating waste water serving as the facilities in the plant. <P>SOLUTION: The method for treating wastewater has: an anaerobic treatment step of treating the wastewater discharged from a facility where the device for producing nitrogen gas is used, in an anaerobic tank to obtain a first treated water; and an aerobic treatment step of treating the first treated water in an aerobic treatment tank to which an aeration is supplied to obtain the second treated water. The method for treating wastewater has a step of making the discharged air generated in the anaerobic treatment step serve as raw material air of the device for producing nitrogen gas, and a step of mixing the nitrogen gas produced by the device for producing nitrogen gas when the nitrogen concentration in the discharged air is more than a predetermined value. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
