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| Titel: |
MECHANISMS OF ACTIVATED CARBON BIOREMOVAL |
| Auteur: |
Specchia, V. Ruggeri, B. Gianetto, A. |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 68 (1988) nr. 1 pagina's 99-117 |
| Jaar: |
1988-06-01 |
| Inhoud: |
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 adsorption capacities at the end of the runs with GAC and PAC were respectively 5 times and 17 times higher than those corresponding to the GAC and PAC physical adsorption isotherms. Carbon physical adsorption capacity seemed to play a fundamental role: the dye biological removal rate obtained with PAC (whose physical adsorption capacity was about 2.5 times higher than that of GAC) turned out to be 3.5 times higher, on the average, than that determined with GAC. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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