Dialysis Separation of Sewage Sludge Digestion

by Mark J. Hammer,
Jack A. Borchardt,

Serial Information: Journal of the Sanitary Engineering Division, 1969, Vol. 95, Issue 5, Pg. 907-928

Document Type: Journal Paper


The purpose was to study both stages of high-rate anaerobic digestion separately. Raw sludge fed into the acid fermentation tank provided substrate for the bacterial production of volatile acids. The acids could then be transferred by diffusion, through the plastic membrane in the dialysis unit, into the methane fermentation tank for conversion to gaseous end products. The process of sludge digestion can be performed using a dialysis-fermentation tank system. The dialysis-fermentation tank apparatus permits the pseudo-enrichment culturing of the acidification and gasification stages in sludge digestion in separate fermentation tanks. The acid fermentation stage is the rate limiting process in anaerobic digestion of sewage sludge. The acid fermenters operate at below optimum to satisfy the optimum conditions necessary for the methane fermentation of the volatile acids.

Subject Headings: Acids | Anaerobic processes | Wastewater treatment | Sewage | Sludge | Methane | Substrates | Bacteria

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