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Nitrogen oxides (NOx) are major air pollutants as they have adverse effects on health and environment. Various combustion equipment, including biosolids incinerators, are the sources of NOx emissions in atmosphere. EPA restricts the emission of NOx gases through the provisions of the Clean AirAct. Various source control measures in the form of the use of low NOx burners, burner staging techniques, etc. are commonly practiced by the generators. Treatment processes e.g. selective catalytic reductions (SCR), selective non-catalytic reduction (SNCR) etc., are also widely used, especially by power plants. Newer processes involving chemical scrubbing of the flue gas have been under development for the last two decades and are being gradually introduced in full scale commercial operation. This paper provides a comprehensive review of the recently developed chemical and biochemical processes for NOx control. Equations for the reaction rates, scrubber sizes and chemical requirements are also presented. A computer based solution of the differential equations governing mass transfer of nitrogen oxides are currently under development by the authors and will be reportedlater. The resulting program is expected to aid engineers in the future design of scrubbers and associated equipment for NOx control by chemical and biochemical processes discussed here.
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Document Type: Research Article

Publication date: 2006-01-01

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