Abstract: Quenching and scrubbing are accomplished simultaneously in a single downflow apparatus which functions both as an adiabatic quencher and a packed bed scrubber. A special feature of the quencher/scrubber is a hot-cool interface which is effective in controlling corrosion.

Abstract: A process for minimizing the formation of nitrogen oxides in the disposal of industrial waste streams containing chemically bound nitrogen, the process comprising the steps of passing a combustion gas stream at about 1200.degree. F. to about 2000.degree. F. to a combustion chamber; mixing an industrial waste stream with a selected mixing ingredient to provide a waste stream mixture having a composition such that adiabatic combustion of the waste stream mixture would yield combustion products having a combustion temperature of about 1500.degree. F. to about 2000.degree. F.; injecting the waste stream mixture into the combustion chamber and contacting same with the combustion gas stream to combust the nitrogen containing compounds to form a composite combustion gas stream having a temperature of from about 1500.degree. F. to about 2000.degree. F. The composite combustion gas stream can be vented to the atmosphere after, preferably, passing same through heat recovery equipment.