| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a biological denitrification method capable of easily obtaining a high-quality treated water at a low cost and a device of the same. SOLUTION: In a method that a wastewater containing an ammoniacal nitrogen is biologically nitrified and denitrified, wherein there are provided the biological denitrification method and the device of the same that the wastewater is treated in a first denitrification process that the ammoniacal nitrogen, a nitrite nitrogen and/or a nitrate nitrogen in the wastewater are partially denitrified as nitrogen gas while the ammoniacal nitrogen is allowed to stay behind in the presence of a mycology of independent nutritious nitrifying bacteria and independent nutritious denitrifying bacteria under a microaerophilic condition and/or an intermittent aeration condition and in a second denitrification that the ammoniacal nitrogen, the nitrite nitrogen and/or the nitrate nitrogen in the effluent of the first denitrification process are denitrified as nitrogen gas in the presence of the mycology of the independent nutritious denitrifying bacteria capable of utilizing a bound oxygen.</p> |
