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Alternative activated/KOH adsorbent for phenol adsorption: experimental, industrial case study and mass transfer
Jarrie P Lima1, Glademir Alvarenga2, Gilber R Rosa2
1Chemical Engineering, Polytechnic School, Pontifical Catholic University of Rio Grande do Sul-PUCRS, Av. Ipiranga 6681, Porto Alegre, RS, 90619-900, Brazil. jarrie@furg.br.
Abstract:
Removal of phenol from wastewater is essential to achieve permitted concentrations according to the recommendations of USEPA. The adsorption capacity of phenol in activated adsorbent with KOH of Enterolobium contortisiliquum (TAC) was evaluated at different temperatures. The Langmuir isotherm represented the equilibrium data of this study. Thermodynamic process was endothermic, spontaneous, and reversible. The mass transfer parameters ranged from KE 0.68 to 0.96 × 10-3 (cm s-1), Ds 8.95 to 14.35 × 10-9 (cm2 s-1), and Dp 5.023 × 10-8 (cm2 s-1). The PVSDM model represented the adsorption kinetics. Intraparticle diffusion limits the mass transfer process Biot > 100. The two-stage process minimized the total amount of TAC required to achieve the permitted specification of phenol concentration in wastewater from different industrial sectors. TAC showed significant performance in the removal of phenol from wastewater.
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