Abstract
Abstract The removal of an organic azo dye-stuff particularly resistant to biodegradation was studied in an activated sludge pilot plant on the basis of the PACT process. Different runs were carried out by adding to the oxidation basin both adsorbent solids (granular activated carbon (GAC), and powdered activated carbon (PAC)) or practically non-adsorbent solid (semisilica fire brick crushed particles (SFB).) Biological removal of the dye-stuff was observed with GAC or PAC addition, whereas no removal was observed with the fire brick particles. Comparison of the results obtained with either GAC or PAC with those from the SFB non-adsorbent solid showed carbon bioregeneration, existing only in the presence of adsorbent solids, to be probably the fundamental mechanism governing biological dye removal. The specific removal rate obtained with carbons, probably dependent on many physical and biological phenomena, was interpreted with saturation type equations typical of biological phenomena. The apparent adsorp...
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