Emil D. Wahl

Date of Award

6-1962

Document Type

Thesis

Degree Name

Master of Science (MS)

Abstract

In order to assess the feasibility of aerobic digestion for the disposal of potato waste effluents, a prepared potato waste stream was processed in an activated sludge system. The waste was contacted with oxygen in an aerator, effluent from which was discharged to a settling cone of equal volume. A dilute product was discharged from the cop of the cone and a concentrated sludge stream from the bottom was recycled to the aerator.

Wastes contain 1750 and 3500 milligrams per liter of potato solids were fed at rates of 2 and 4 times the aerator volume per day, with a recycle rate of 26 aerator volumes per day for all runs. Aerator temperature was maintained 30 degrees Celsius and the initial aerator pH at about 7.5

Aerator loading proved too high for steady-state operation, and digestible matter accumulated in the system. Nevertheless the system proved capable of digesting the wastes, and 16 to 59% of the volatile solids present was consumed during runs. The bacterial species predominating in the system were tentatively identified as Xanthomonas App, and Escherichis freundii

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