Denitrification in a Submerged Bio-Disc System with Raw Sewage as Carbon Source,
TRONDHEIM UNIV (NORWAY) DIV OF HYDRAULIC AND SANITARY ENGINEERING
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An investigation of denitrification by biofilms has been performed in two submerged bio-disc units with municipal sewage as carbon source. The project is based upon the process that the authors presented in the Proceedings of The First National Symposium on Rotating Biological Contactor Technology 1. The flow sheet of the process is shown in Figure 1. Nitrate-rich effluent is recycled to the inlet of an anoxic tank where denitrification takes place with raw municipal sewage as carbon source. In this paper results are presented from a later more thorough study of the denitrification part, in order to establish the basic design criteria for the process. The goal was to find the denitrification rate, - temperature dependency, - pH dependency, - energy consumption and - alkalinity production.