Abstract

A material-balance model for an activated sludge treatment system is presented. The equations completely describe the behavior of the aeration basin. There are two main parameters in the equations. The mass transfer between the air stream and the basin contents must be found. Likewise, the rate of biological oxidation of the organic must be determined. Experimental results are reported which were obtained when acrylonitrile was treated in a subsurface activated-sludge apparatus. Included in the study are data for air stripping of acrylonitrile from a sterile biologically inactive system. By solving for the amount of air stripping and liquid concentrations, a direct comparison with experimental data is possible. 7 references, 1 figure, 1 table.

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