Process for the elimination of ammonia in coke plant waste waters

Claim 1

A process for concurrently treating an ammonia-containing waste fluid stream and a NO x -containing flue gas from a coking plant comprising: separating the waste fluid stream into a major portion and a minor portion; combining the major portion of the waste fluid stream with the flue gas to form a mixture containing at least a stoichiometric ration of NO x to ammonia; introducing the mixture into a reactor in the form of a spray or vapor; reacting the mixture in a first catalyst bed at a temperature of at least about 250° C. for converting a substantial amount of ammonia in the waste fluid stream and NO x in the flue gas into a nitrogen and water vapor reaction product, the reaction being exothermic; heating the minor portion of the waste fluid stream in the reactor with the heat generated from the reaction of the mixture in the first catalyst bed; and reacting in a second catalyst bed the minor portion of the waste fluid stream with the reaction product of the first catalyst bed for converting a further amount of ammonia in the waste fluid stream and NO x in the flue gas into a nitrogen and water vapor waste gas, and removing said waste gas from said reactor.