Investigating Role of Growing Adsorbent Bed in a Dead-End PAC/UF Process
Publication: Journal of Environmental Engineering
Volume 131, Issue 11
Abstract
A two-stage mathematical model was developed to describe adsorbate removal in a dead-end powdered activated carbon/ultrafiltration (PAC/UF) membrane process. Para-nitrophenol (PNP) was used as the model organic compound. The first stage accounted for adsorbate removal during transport from the initial PAC contact with the PNP solution to the membrane system, and the second stage accounted for additional PNP removal due to the retention of the PAC in a growing bed on the membrane surface. The PAC adsorptive capacity was described using the Langmuir isotherm, whose parameters were estimated from isotherm experiments. Transport of the PNP through the PAC particle was described using the homogeneous surface diffusion model and the surface diffusivity was estimated from batch experiments. The two stage model predicted the effluent concentrations from the PAC/UF process during the early stages of the experiments, but model improvements are required to more accurately predict the latter stages. A batch model can be used to describe the effluent PNP concentration from the PAC/UF process if dispersion is neglected.
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Information
Published In
Journal of Environmental Engineering
Volume 131 • Issue 11 • November 2005
Pages: 1583 - 1588
Copyright
© 2005 ASCE.
History
Received: Jul 29, 2004
Accepted: Dec 20, 2004
Published online: Nov 1, 2005
Published in print: Nov 2005
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