Tabak, HH; Grady, CP; Volskay, VT
A pilot plant study was undertaken to better understand the fate and effects of 33 organic compounds listed in the Resource Conservation and Recovery Act (RCRA) on the activated sludge process. Eleven were insufficiently inhibitory to justify further testing and eight had responses that varied over time making it impossible to quantify their efforts. The kinetic impacts of the remaining 14 (carbon tetrachloride, chlorobenzene , chloroform, 1,2-dichloroethane, 1,2-dichloropropane, 2,3- dimethyl phenol, methylene chloride, nitrobenzene, phenol, tetrachoroethylene, toluene, 1,1,1-trichloroethane, 1,1 ,2-trichloroethane, and trichloroethylene) were quantified by measuring the Monod kinetic parameters for butyric acid degradation in the presence of several inhibitor concentrations using a respirometric-based assay. Attempts to model the effects of inhibitor concentration on the Monod kinetic parameters with classical linear, reversible inhibition models were unsuccessful but it was possible to model them with a general inhibition model proposed by Han and Levenspiel. (Author 's abstract)