Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 421723
Title Effect of leaking natural gas on soil and vegetation in urban areas
Author(s) Hoeks, J.
Source Landbouwhogeschool Wageningen. Promotor(en): G.H. Bolt. - Wageningen : Pudoc - ISBN 9789022004029 - 120
Department(s) Wageningen University
Publication type Dissertation, internally prepared
Publication year 1972
Keyword(s) biogas - oogstschade - schade - milieueffect - brandstoffen - koolwaterstoffen - methaan - aardgas - houtachtige planten als sierplanten - fysicochemische eigenschappen - plantenziekten - afwijkingen, planten - plantenziektekunde - plantenplagen - gewasbescherming - wegbeplantingen - wegbermplanten - bodemlucht - bodemchemie - bodemverontreiniging - bodemeigenschappen - bodemzoutgehalte - bodemkunde - bodemgiftigheid - biogas - crop damage - damage - environmental impact - fuels - hydrocarbons - methane - natural gas - ornamental woody plants - physicochemical properties - plant diseases - plant disorders - plant pathology - plant pests - plant protection - roadside plantations - roadside plants - soil air - soil chemistry - soil pollution - soil properties - soil salinity - soil science - soil toxicity
Categories Air Pollution
Abstract

Leakage of natural gas from the gas distribution system affects the physical, chemical and biological processes in the soil. Particularly the microbial oxidation of methane is then of predominant importance for the composition of the soil gas phase. The rate of methane oxidation was measured under varying conditions of gas phase composition, temperature and nutrient supply. Computation models were evolved with which it is possible to calculate the effect of these and other factors on the distribution of methane, oxygen and carbon dioxide around a leak. Experiments with actual and artificial leaks as well as the calculations showed that the extent of the gas zone largely depends on the leakage rate, the depth of the groundwater table, the soil moisture content and the extent of the pavement. The soil temperature also proved to have a significant influence by its effect on the microbial methane oxidation. At low temperatures this microbial process is limited and consequently the anaerobic zone, which is invariably present in summer, may then disappear completely, thus making the probability of injury to vegetation negligible in winter. After repair of the leak the poor aeration conditions in the soil may persist for quite a long time. This is caused by the high consumption rate of oxygen required for the oxidation of organic substances and reduced anorganic compounds accumulated in the soil during gas leakage. The oxygen overdemand and the oxidation rate were determined for various gassed soils. Measures can be taken to accellerate soil recovery processes and to improve conditions for regeneration of injured trees and before planting new trees. Both experiments and calculations with computation models proved that installation of open ventilation channels is very effective, even if the leak cannot be immediately repaired. So ventilation channels can also be installed as preventive measure.

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