METHOD AND APPARATUS FOR TREATING NITROGEN-CONTAINING WASTE WATER

摘要

PROBLEM TO BE SOLVED: To provide a method and apparatus for efficiently treating nitrogen-containing waste water capable of highly controlling the concentration of dissolved oxygen when nitration and denitrification treatment is performed in the same tank by combining ammonia oxidizing bacteria and autotrophic denitrifying bacteria.SOLUTION: In a nitrogen-containing waste water treatment method for treating ammoniacal nitrogen-containing waste water by the ammonia oxidizing bacteria and the autotrophic denitrifying bacteria, a reaction tank 10 is filled with a porous carrier 28 with a volume of 0.05 cmor above and at least a part of ammoniacal nitrogen is converted into nitrous acid by the ammonia oxidizing bacteria adhered to the porous carrier 28 while denitrification is performed by the autotrophic denitrifying bacteria adhered to the porous carrier 28.