Single Sludge Nitrogen Removal from Industrial Wastewater

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Abstract
Nitrogen removal by the single-sludge nitrification and denitrification process offers several economic advantages over the multi-sludge systems. This paper provides a description of the processes involved, and a discussion of some chemical and kinetic aspects with emphasis on industrial applications. A relatively simple design procedure is presented using zero order kinetics for nitrogenous subtrates removal and first order kinetics for carbonaceous organics removal. The solution is obtained by a trial and error calculation procedure. Finally, two examples are presented of operating systems treating industrial wastewater. One example is a bench-scale study of an amino acid production wastewater and the other is a full-scale plant treating wastewater from a combined pharmaceutical-pesticides-herbicides processing. Both systems effectively reduce the concentration of carbonaceous organics, ammonia and nitrate to very low levels.

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