Additional technical information about our Filtralite® Air products and solutions.

<b>Evaluation of Filtralite Air performances for odour treatment</b><br> <br> Used as packing materials in biotrickling filters, Filtralite Air media support higher H<sub>2</sub>S and toluene removal efficiencies than conventional plastic rings, and significantly better process start-up, with residence times of 7.5 to 15 seconds.

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<b>Comparative study of mass transfer coefficients for biotrickling filter packing materials</b> <br>Biofiltration is a cost effective technology for reduction of odor emissions from intensive pig production, but removal of volatile sulfur compounds may be limited by low mass transfer. In order to get a better understanding of the limitations for optimization and further development of biofiltration for odor control, a study of overall mass transfer coefficient of volatile sulfur compounds for packing materials potentially used for biotrickling is presented.<br>

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<b>Air flow characteristics in granular biofilter media</b> <br>Pressure drop as a function of air velocity is a key parameter controlling air cleaning biofilter cost efficiency. The objective of this study was to investigate the relationship between air velocity and pressure drop, material particle size distribution and wetting conditions for Filtralite AIR (Leca LWA). The study shows that increasing particle size average and reduced particle size range together with wetted condition in general are positive for pressure drop.

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<b>Air-water mass transfer of sparingly soluble odorous compounds in granular biofilter media</b> <br>Mass transfer from air to liquid phase is a key parameter controlling the efficiency of air cleaning biofilters. Removal of soluble organic compounds like H2S is mass transfer limited. This study investigates the impact of particle size, gas velocity and chemical properties of contaminants on the overall volumetric mass transfer coefficient based on direct measurements of odorous organic compounds in granular media.

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<b>Biofiltre med Leca reducerer lugt-, ammoniak- og svovlbrinteemissionen</b> <br>I denne afprøvningen blev renseeffektivitet og driftsstabilitet for fire Filtralite AIR baserede biofiltre ved rensning af ventilasjonsluften fra en slagtesvinestald undersøgt. Filtralite AIR baserede biofiltre reduserer konsentrasjonen af lugt, ammoniak og svovelbrinte med hhv 78, 96 og 26%.

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<b>Chemisorption of hydrogen sulphide and methanethiol by light expanded clay aggregates</b> <br>Removal of volatile sulphur compounds from livestock waste air by biological air filtration may be enhanced by use of filter materials with reactive properties (autocatalytic removal). In this study, Filtralite AIR was tested with respect to sorption and potential chemical degradation of H2S, methanethiol and dimethyl sulphide.

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<b>Experimental determination of mass transfer coefficients of volatile sulfur odorants in biofilter media</b> <br>Mass transfer from air to liquid phase is an important process that may limit the efficiency of biological air filters used for abatement of odor from life stock production facilities. In this study, a method based on Proton-Transfer-Reaction Mass Spectrometry has been developed in combination with a developed model to determine the mass transfer coefficient of volatile Sulphur compounds for selected filter materials used in biofilters.

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<b>Biofilter media gas pressure loss as related to media particle size and particle shape</b> <br>Pressure loss is a key parameter for estimating biofilters energy consumption. This paper investigates the combined impact of filter medium particle size and shape on the air volume – pressure loss relationship. A new model concept for estimating air volume – pressure loss across different particle size distributions and particle shapes are proposed.

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<b>Minor losses during air flow into granular porous media</b> <br>Pressure gradients during uniform fluid flow in porous media are traditionally assumed to be linear. In this study, measurements of pressure gradients inside filter media bed with coarse granular porous media are investigated with respect to an initial pressure loss near inlet and a linear pressure gradient through the filter bed.

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<b>Pressure drop in biofilters are related to dust and biomass accumulation</b> <br>Pressure drop is a key parameter controlling cost efficiency of air cleaning biofilters. Pressure drop will increase over time due to accumulation of biomass and dust. This study investigates the correlation between initial pressure drop and the development of such during accumulation of biomass and dust.

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