Mixing and Polymer Performance in Sludge Dewatering

by John T. Novak, Oregon State Univ, Corvallis, OR, USA,
John F. Prendeville, Oregon State Univ, Corvallis, OR, USA,
Joseph H. Sherrard, Oregon State Univ, Corvallis, OR, USA,

Document Type: Proceeding Paper

Part of: Environmental Engineering


A biofilm reactor, termed the support-aerated biofilm (SAB), was developed in which oxygen was supplied to the interior of the biofilm through a permeable membrane. The reactor was tested on filtered sewage supplemented with nutrient broth; the bulk solution was anoxic and the interior of the biofilm was supplied with pure oxygen. A non-steady state biofilm developed and all tests were completed when the depth was approximately 1 mm. Mass balances on total organic carbon, ammonia, organic nitrogen, and nitrate showed that combined heterotrophic oxidation of organics, denitrification, and nitrification occurred simultaneously within the biofilm.

Subject Headings: Biofilm | Polymer | Synthetic materials | Sludge | Dewatering | Waste treatment | Soil mixing | Materials processing

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