Abstract
AbstractParticularities in Purification of Carbohydrate Waste Waters. Biological purification of mostly carbohydrate‐containing waste waters leads to the formation of a very light activated sludge as experiments in practice invariably show. In general, microscopy shows a bacterial sustance which is highly permeated by threadlike microorganism. This bulky sludge, characterized by little to very little dry substance, does not only impede a good or at least satisfactory utilization of the activation stage but also hinders and disturbs separation of purified water and activated sludge.With an anaerobic pre‐treatment of carbohydrate waste waters these water may be altered to a degree which enables their subsequent bio‐chemical purification under normal activated sludge conditions. This combination within an anaerobic‐aerobic process is currently used for purification of waste waters from sugar production, production of hard beards and in the process of spirit manufacturing. In these industries waste heat is used as energy carrier in the anaerobic stage, and waste water is partly degraded during its conversion. Respective combinations of processes seem possible and necessary for purification of waste waters from starch factories.
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