[Nitritation-ANAMMOX process for treatment of ammonium rich wastewater].

Combination of a nitritation process and anoxic ammonium oxidation (ANAMMOX) process for the treatment of ammonia rich influents is evaluated. Herein the combined process was studied with manmade synthetic wastewater. Research results show that when the hydraulic retention time (HRT) was I day, the nitritation activity was stable and the influent ammonium concentration has little effect on it. When the influent ammonium concentration is 400-600 mg/L, the effluent nitrite concentration is always between 260 mg/L and 280 mg/L, so the effluent nitrite/ammonium ratio can be adjust by control the influent ammonium concentration. The total nitrogen elimination was depended strongly on the nitrite/ammonium ratio in the inlet of the ANAMMOX reactor. When the inlet ammonium was 480 mg/L of the combined process, the nitrite/ammonium ratio of the nitritation process was about 1.2, the total nitrogen elimination was 84%.