| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently remove nitric acid ions from the water containing nitric acid ions and to make it harmless. SOLUTION: This method consists of a first process for obtaining concentrated water 3 having >=4000ppm TDS and desalted water 4 from the raw water 1 containing nitrogen oxide ions in an electrodialysis tank 2 and a second process for treating the concentrated water with salt-resistant denitrification bacteria in a biological denitrfication tank 7.</p> |
