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Transient Performance of Biofilters Treating Mixtures of Hydrophilic and Hydrophobic Volatile Organic Compounds
The biological degradation of hydrophilic and hydrophobic volatile organic compounds (VOCs), discharged in pulp and paper and wood products air emissions, was examined under transient operating conditions. Two identical bench-scale biofilters were operated in parallel in order to study the influence of step loads on the removal of a-pinene, a hydrophobic VOC, and methanol, a hydrophilic VOC. The biofilter media consisted of a mixture of wood chips and spent mushroom compost that was further mixed with either perlite or small-size wood chips. The biofilters provided complete methanol removals during the start-up period due to the absorption process followed by biodegradation. For a-pinene, however, there was an acclimation period of 1 week to 10 days before the biofilters achieved 100% a -pinene removal efficiency. Step changes in the methanol loading rate did not affect the performance of the biofilters with respect to methanol. However, these fluctuations significantly influenced a-pinene biodegradation provided enough time (i.e., several days) was allowed. The removal rate of a-pinene gradually decreased along the column after each step increase in methanol inlet concentration. It appears that the presence of high concentrations of metha-nol, a hydrophilic and easily biodegradable compound, adversely impacted the growth of the a-pinene degrading microbial community, thereby decreasing a-pinene removal capacity of the biofilters over time. Unlike a-pinene, the methanol biodegradation rate was not affected by the presence or absence of a-pinene and with a-pinene fluctuations in the inlet airstream.
Transient Performance of Biofilters Treating Mixtures of Hydrophilic and Hydrophobic Volatile Organic Compounds
The biological degradation of hydrophilic and hydrophobic volatile organic compounds (VOCs), discharged in pulp and paper and wood products air emissions, was examined under transient operating conditions. Two identical bench-scale biofilters were operated in parallel in order to study the influence of step loads on the removal of a-pinene, a hydrophobic VOC, and methanol, a hydrophilic VOC. The biofilter media consisted of a mixture of wood chips and spent mushroom compost that was further mixed with either perlite or small-size wood chips. The biofilters provided complete methanol removals during the start-up period due to the absorption process followed by biodegradation. For a-pinene, however, there was an acclimation period of 1 week to 10 days before the biofilters achieved 100% a -pinene removal efficiency. Step changes in the methanol loading rate did not affect the performance of the biofilters with respect to methanol. However, these fluctuations significantly influenced a-pinene biodegradation provided enough time (i.e., several days) was allowed. The removal rate of a-pinene gradually decreased along the column after each step increase in methanol inlet concentration. It appears that the presence of high concentrations of metha-nol, a hydrophilic and easily biodegradable compound, adversely impacted the growth of the a-pinene degrading microbial community, thereby decreasing a-pinene removal capacity of the biofilters over time. Unlike a-pinene, the methanol biodegradation rate was not affected by the presence or absence of a-pinene and with a-pinene fluctuations in the inlet airstream.
Transient Performance of Biofilters Treating Mixtures of Hydrophilic and Hydrophobic Volatile Organic Compounds
Mohseni, Madjid (author) / Allen, D. Grant (author)
Journal of the Air & Waste Management Association ; 49 ; 1434-1441
1999-12-01
8 pages
Article (Journal)
Electronic Resource
Unknown
The Performance of Fibrous Peat Biofilters in Treating Domestic Strength Wastewater
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