Propane Removal from Propane-Air Mixtures by Soil Beds

Ebinger, M. H.; Bohn, Hinrich L.; Puls, Robert W.

doi:10.1080/08940630.1987.10466344

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…They also underline that a drying period of the Ðlter-bed could provoke irreversible e †ects by modifying its structure, which was conÐrmed by Bohn.69 An adequate value seems to be in the range 30È80% for peat, compost and wood subproducts.10,29 For soil-bed systems, the optimal moisture content seems to be 10È20%. 32,46,67,76 Control of the Ðlter-bedÏs moisture content is either by means of a spray system dispersing water directly on the Ðlter-bed and/or by indirectly regulating the moisture content through humidiÐcation of the in-going polluted air (Table 4). In the case of direct spraying, Van Lith et al 75 stress the importance of a small droplet size in order to uniformly disperse the liquid and to limit the impact of the droplets on the carrier material.…”

Section: Moisture Contentmentioning

confidence: 99%

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Review: Waste gas biotreatment technology

Kennes

Thalasso

1998

J. Chem. Technol. Biotechnol.

248

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This paper presents fundamental and theoretical aspects of biological waste gas treatment technologies as well as examples of applications to di †erent compounds. The three most widely used technologies are described, namely bio-Ðltration, bioscrubbing and trickling bioÐltration, focusing more extensively on bioÐltration which is the most studied and most extensively used process. A description of the di †erent technologies from technological and economic points of view, including an analysis of models used in waste gas biotreatment is given. Results presented in the literature concerning the removal of aliphatic, aromatic and mixtures of contaminants are reviewed. Carrier materials, inocula selected and alternatives proposed for regulating moisture content, pH values or for controlling pressure drop are considered. New technologies and reactor design studied at laboratory-scale are mentioned.1998 SCI (

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Section: Moisture Contentmentioning

confidence: 99%

“…Values in the range of 10È20¡C39,80 have been reported. Even values as low as 2¡C were men-tioned for propane treatment in a soil-bed system 76. It is important to stress that a temporary biological deactivation of the Ðlter bed does not necessarily mean complete loss of the treatment capacity, for example, the adsorption phenomena may still take place.…”

mentioning

confidence: 99%

Review: Waste gas biotreatment technology

Kennes

Thalasso

1998

J. Chem. Technol. Biotechnol.

248

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“…The diffuse flow through permafrost should be less than the migration flow of microseeps, so the 0.005 g CH 4 m −3 could be taken as a first-order upper estimate of the diffuse flow. Laboratory incubations have shown that the half-life of C 3 H 8 in soils of different wetness and composition at temperatures of 1-3 • C is 20-100 h, during which the concentration decreases exponentially to trace values [68]. Hence, hydrocarbon concentrations in freezing soils of our site should have degraded to trace amounts at the minimum rate in the timeframe of several days without a sourcing flow.…”

Section: Diffuse Flowmentioning

confidence: 87%

Fluid Migration through Permafrost and the Pool of Greenhouse Gases in Frozen Soils of an Oil and Gas Field

et al. 2022

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Most methane (CH4) and carbon dioxide (CO2) emissions originate from the biodegradation of organic matter of soils and of degrading permafrost in the Arctic. However, there is limited evidence of the activity of geological sources, and little understanding of the pathways of migration of gaseous fluids through the porous mineral matrix filled with ice. We estimated the effect of geological factors on the winter storage of the greenhouse gases in frozen soils by statistical analysis of the geodatabase, which combined a field gas survey of frozen soils, subsurface sounding, and remote sensing data. Frozen soils stored on average 0.016 g CH4 m−3 and 11.5 g CO2 m−3. Microseeps, recognized by isolated anomalies of helium, had 30% higher CH4 concentrations. Lineaments marking margins of tectonic blocks were estimated to have 300% higher CH4 concentrations. High concentrations of propane and ethane indicated the contribution of diffuse fluid flow from hydrocarbon-bearing beds on 95% of the 130 km2 study area. In addition to the fluid contribution, we estimated an overwintering pool of greenhouse gases in frozen soil for the first time. Being at least 0.01–0.1% of the soil organic matter mass, these gaseous forms of carbon can be critical for the early-summer Arctic ecosystem functioning.

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“…However, depending on the nature of the carrier material, slightly higher or lower water contents seem to be suitable . Some examples are the treatment of sulphur compounds in peat biofilters operated at a moisture content around 70--74% (Hirai el al., 1990) or the removal of propane by soil beds at a water content of only 20% (Ebinger et al, 1987). The suitability of such high or low water contents does not necessarily mean that these values are optimal.…”

Section: Lrifluence Of Water Content In Biofiltrationmentioning

confidence: 99%