Nitrogen Oxides (NOx) is a chemical family consisting of several compounds, the three most common of which are Nitrous Oxide (N2O), Nitrogen Dioxide (NO2), and Nitric Oxide (NO). Nitrous Oxide is the familiar “laughing gas” frequently administered to dental patients and has no significant environmental hazards. Nitrogen Dioxide is an air pollutant due to its reaction with moisture in the atmosphere to form acid rain. It also has an unsightly orange-brown hue which causes excessive stack opacity. Nitric Oxide is an air pollutant since it reacts with oxygen in the atmosphere to form NO2. Nitrogen Dioxide emissions are regulated by opacity, and total NOx is regulated by annual emitted tonnage.

AAT, Inc. Orion series NOx Air Scrubber Systems may incorporate as many as six scrubbing steps in series, depending on NOx constituents and concentrations. Unlike other acid gases, such as Sulfur Dioxide (SO2), NOx is not effectively scrubbed using caustic water alone. Strong reducing and/or oxidizing agents applied sequentially are also required. Furthermore, extended tower packing bed heights are required as compared to other acid gas scrubbers. Since the best reducing agent for NO2 air scrubber is Sodium Hydrosulfide (NaHS), a final odor control air scrubber to prevent Hydrogen Sulfide (H2S) slip may also be desirable.

AAT, Inc. will determine the optimum number of air scrubber stages and chemistries for a given NOx stream and treatment goal. Techniques for minimizing water and chemical usages are also incorporated into our air scrubber designs. We offer a complete package, including instrumentation and controls, chemical storage tanks and metering pumps, wastewater pretreatment system, and skid-mounting of air pollution control equipment for ease of installation.