Detail Mass transfer and adsorption of volatile organic compounds onto granular activated carbon during loading and regeneration Bibliografi Author: Paulsen, Paul David ; Cannon, Fred S. (Advisor) Topik: ENGINEERING; ENVIRONMENTAL|ENGINEERING; SANITARY AND MUNICIPAL|ENVIRONMENTAL SCIENCES Bahasa: (EN )    ISBN: 0-599-14697-4     Penerbit: THE PENNSYLVANIA STATE UNIVERSITY     Tahun Terbit: 1998     Jenis: Theses - Dissertation Fulltext: 9915917.pdf (0.0B; 0 download) Abstract The research described herein evaluated the various physical and chemical processes that occur in a GAC bed during VOC pollutant removal and regeneration with ozone. The experiments and analyses were divided into the examination of: (1) adsorption equilibrium, (2) the kinetics of adsorption and desorption, and (3) the effect of ozonation on GAC regeneration. Thermogravimetric analysis and gas chromatography provided an accurate means for the collection of the kinetic and equilibrium adsorption data over a wide range of conditions. The adsorption equilibrium experiments compared and modeled the adsorption of methylisobutylketone (MIBK), m-xylene, and argon onto a coconut based GAC. Adsorption equilibrium for MIBK and m-xylene was examined between the relative pressures of 10-4 to 0.2 and the temperatures of 25–105°C. Polytherm equation models were constructed from the Dubinin-Astakhov and Modified Freundlich isotherms to describe equilibrium. When equilibrium was examined for the different adsorbates at their respective boiling points, the volume adsorbed to the GAC also matched. This significant result was used to construct a multi-component polytherm for m-xylene and MIBK and to develop a method to approximate the adsorption behavior for untested VOCs using their known condensation behavior. In order to correlate equation parameters to carbon properties such as pore size distribution and source material, argon and nitrogen adsorption data for several other GACs were also examined. Mathematical models for intraparticle diffusion and first order rate adsorption were constructed to describe the kinetic adsorption process. Numerical analysis applied these two kinetic models to m-xylene and MIBK adsorption and desorption data for different temperatures, concentration ranges, and GAC grain sizes. The simpler first order rate model was found to be more accurate and consistent than the intraparticle diffusion model. This modeling of kinetic data also produced expressions describing the temperature dependence of the kinetic rate coefficients. The ozonation of GAC produced increased removal of VOCs during regeneration processes at temperatures from 25 to 105°C. After regeneration, the GAC was shown to retain most of its previous adsorption ability. Finally, these laboratory analyses were integrated into a full scale GAC bed computational model. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Lihat Sejarah Pengadaan  Konversi Metadata   Kembali

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