Abstract
Survival of microorganisms in soils from treatment facility and landfill of wooden railway sleepers contaminated with creosote oil as well as in two types of soils with different content of organic carbon, treated with creosote oil vapors, was assessed. Microbiological assays including determination of: the biomass of living microorganisms method and the number of proteolytic, lipolytic and amylolytic microorganisms were carried out under laboratory conditions. Chromatography analysis of the soil extract from railway sleepers treatment facility was performed using GC/MS. The highest biomass and the number of tested microorganisms were determined in soils from wooden railway sleepers landfill, while the lowest in soil from the railway sleepers treatment facility. Vapors of creosote oil, regardless of the soil type, significantly increased only the number of lipolytic bacteria.
Highlights
Development of railways in Poland is associated with investments in more and more modern fleet, and with the maintenance of an adequate standard of railway lines
The number of microorganisms are given as colony forming units (CFU) recalculated onto 1 gram of dry matter (DM) [CFU·g-1 DM]
The creosote oil is a mixture of compounds such as aliphatic hydrocarbons, aromatic hydrocarbons, polycyclic aromatic hydrocarbons (PAHs), heterocyclic compounds containing sulfur, oxygen, nitrogen, and carboxyl group [16]
Summary
Development of railways in Poland is associated with investments in more and more modern fleet, and with the maintenance of an adequate standard of railway lines Achieving this goal requires incurring expenditures on production and subsequent utilization of used railway sleepers needed for the construction of railway tracks. Known as the impregnation oil, is a mixture of products derived from the distillation of coal tar and boiling at 200–360°C temperatures [2]. It is a mixture of hundreds of compounds, of which only a small fraction (less than 20%) is present in an amount exceeding 1%. Toxic effect of these substances on plants was confirmed [1]
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