HESTIANIC ACID-A BIOLOGICALLY RESISTANT PIGMENT FROM AEROBIC WASTE DIGESTERS.
BOEING CO SEATTLE WASH
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The isolation and chemical properties of brown, copper-containing pigment which arises from aerobic, biologic degradation of hyman waste are described. This pigment, called hestianic acid, was shown to possess a formidable structural complexity and heterogeneity. It was also notable for its chemical and biologic inertness and, therefore, represented the main bulk of the residual organic material in the well-digested, activated sludge-process effluent. The present evidence indicates, but does not prove, that hestianic acid derives from the ubiquitous melanine pigments in natural foodstuffs. The pigment also possesses several properties in common with the humic acids and would, under less artificial conditions, be incorporated into the humic acids of the soil. Author