SciELO - Scientific Electronic Library Online

 
vol.39 número5Effect of land area on average annual suburban water demandPlanktonic algae and cyanoprokaryotes as indicators of ecosystem quality in the Mooi River system in the North-West Province, South Africa índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Articulo

Indicadores

Links relacionados

  • En proceso de indezaciónCitado por Google
  • En proceso de indezaciónSimilares en Google

Compartir


Water SA

versión On-line ISSN 0378-4738

Resumen

LIM, Jun-Wei et al. Response of low-strength phenol-acclimated activated sludge to shock loading of high phenol concentrations. Water SA [online]. 2013, vol.39, n.5, pp. 695-700. ISSN 0378-4738.

The objectives of this study were to: (i) evaluate the growth of low-strength phenol-acclimated activated sludge, (ii) investigate the degradation pathways and (iii) model the growth and biodegradation kinetics, all under the condition of increasingly higher phenol concentrations (step-up shock loading). With the use of activated sludge acclimated to phenol concentration of 140 mg.ℓ-1 (low-strength phenol-acclimated activated sludge), complete degradation of phenol with a COD removal efficiency of more than 95% was achieved up to 1 050 mg.ℓ-1 of initial phenol concentration. At low initial phenol concentrations, the experimental results were indicative of the meta-cleavage pathway for phenol degradation. When the initial phenol concentration was above 630 mg.ℓ-1, the degradation results were indicative of both meta- and ortho-cleavage pathways. The values of the Haldane kinetic parameters indicated a low degree of inhibition exerted by the presence of increasing phenol concentration. This was substantiated by the observation that the rate constant of phenol removal decreased by only 33% even though the initial phenol concentration was increased by 15 times from 70 to 1 050 mg.ℓ-1. Thus, the activated sludge acclimated to only 140 mg.ℓ-1 of phenol could successfully treat up to 1 050 mg.ℓ-1 of phenol without experiencing complete inhibition during the degradation process.

Palabras clave : Phenol removal; low-strength phenol-acclimated activated sludge; degradation pathway; Haldane kinetic parameter.

        · texto en Inglés