Biological nutrient removal (BNR) is simple and affordable with the Biolac® Wave-Ox™ Plus process. Proven by hundreds of successful installations, the Wave-Ox™ Plus process is a simple, single basin total nitrogen removal process developed specifically for the Biolac System’s unique, long sludge age process and moving aeration chain design. Automatic control of the air flow distribution to the moving aeration chains creates unique moving waves of multiple oxic and anoxic zones. This repeated cycling of environments nitrifies and denitrifies the wastewater in the long sludge age Biolac basin without nitrate recycle, separate staging or additional external basins. Nitrogen removal to 5 mg/l is typical with many municipal installations achieving <3 mg/l total N.