Patent ID: 7135110

Claim:
A denitrification system for treating nitrified wastewater or nitrified water comprising: a series of interconnected tanks positioned underground, each tank having an inlet and an outlet and a conduit connecting an outlet of a preceding tank to an inlet of a succeeding tank; a first tank of said series of interconnected tanks receives at said inlet said wastewater or nitrified water having nitrates and nitrites; means for providing a detergent to said first tank, said detergent enhancing the reduction of said nitrates and nitrites to gaseous nitrous oxide (N 2 O) and nitrogen (N 2 ); means for controlling the amount of detergent introduced into said first tank in accordance with the flow volume of said nitrified wastewater or said nitrified water entering said first tank; and at least one detention tank in said series of interconnected tanks coupled to an outlet of said first tank via said conduit for receiving effluent from said first tank.