Abstract
Simulated synthetic sewage was treated in a laboratory-scale, completely mixed, activated sludge plant. Careful control of flow, loading and sludge recycle allowed the plant to be maintained in an essentially steady-state condition for extended periods. “Lumped parameter” determinations were done to assess the plant operating performance in conventional terms. For comparison, more sophisticated determinations were also applied: molecular weight fractionation, amino acids, ammonium-, nitrate- and nitrite-nitrogen, and carbon and nitrogen in the biomass (sludge). Molecular weight fractionation allowed a better characterization of dissolved carbonaceous pollutants. Samples were initially concentrated by low-temperature vacuum evaporation, followed by fractionation by low-pressure gel chromatography. The results demonstrate the value of this method in establishing the fate of complex carbonaceous pollutants present in the feed to biotreaters and in indicating the residual carbonaceous pollutants in the discharge.
Published Version
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