Introduction of the IC reactor in the paper industry
Among the anaerobic systems applied for the treatment of paper industry effluents, the IC (Internal Circulation) reactor is gaining a lot of interest. The reactor combines good biomass retention at the outlet with excellent mixing characteristics in the lower part of the reactor. This leads to smaller reactor volumes and less space requirements. Three examples of IC reactors at various recycle mills are presented. Other applications exist for treatment of sulphite and kraft mill condensates. An IC reactor for thermophilic treatment of process water in the closed water circuit of a board mill is currently being commissioned.