Wyniki wyszukiwania - BazTech

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The influence of atmospheric conditions on the migration of diesel fuel spilled in soil

Vuruna M., Veličković Z., Perić S., Bogdanov J., Ivanković N., Bučko M.

Archives of Environmental Protection

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2017

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Vol. 43, no. 1

73--79

EN

The most common chemical’s spills in typical transportation accidents are those with petroleum products such as diesel fuel, the consequence of which is an extensive pollution of the soil. In order to plan properly fuel recovery from the soil, it is important to gain information about the soil depth which may be affected by pollutant and to predict the pollutant concentration in different soil layers. This study deals with the impact of basic atmospheric conditions, i.e. air temperature and humidity on the diesel fuel migration through the soil. The diesel fuel was spilled into columns (L = 30 cm; D = 4.6 cm) filled with sandy and clay soil samples, and its concentrations at various depths were measured after 11 days under various air temperature (20 and 40°C) and relative humidity (30–100%) conditions. The effects observed were explained by understanding physical processes, such as fuel evaporation, diffusion and adsorption on soil grains. The increase in temperature results in higher fuel evaporation loss and its faster vertical migration. The relative humidity effect is less pronounced but more complex, and it depends much on the soil type.

2

Groundwater Formation Below Chernozem Soils - Effect of Mineral Fertilization, Rainy and Dry Periods

Sager M.

Ecological Chemistry and Engineering. S

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2013

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Vol. 20, nr 2

291-302

EN

Chernozem soil samples from the east of Austria have been packed into columns in order to investigate the effects of mineral fertilization on the composition of water, released to deeper layers. A solution imitating NPK fertilization was added on top of water-saturated columns, and washed down with 150 cm3 portions (about 0.1 pore volumes) every day except weekends, for 2 months. The eluates were collected and analyzed by ICP and AAS methods. After about one pore volume, a strong peak in alkali, alkaline earths, and sulfate occurred in the eluates, due to ion exchange with the fertilizer solution. After this, most concentrations in the eluates approached a steady state again, but lower than the levels met before. After a period of drying, the release of K and S, as well as P in 2 of 3 cases, increased, whereas the release of Fe and Mn decreased. Before the eluates entered the sample collection vessels, ochre precipitation scavenged many solutes (Cr > Al > Pb > P > V > Fe), but left Mo-Sr-Mg-K-Se-B rather untouched.

PL

Za pomocą doświadczeń kolumnowych zbadano wpływ nawożenia mineralnego na skład wody w głębszych warstwach gleby. W doświadczeniach wykorzystano próbki czarnoziemów zebranych na terenach wschodniej Austrii. Roztwór imitujący nawozy NPK wprowadzano na szczyt kolumny nasyconej wodą porcjami po 150 cm3 roztworu (co stanowiło około 0,1 objętości porów) codziennie, z wyjątkiem weekendów, przez 2 miesiące. Eluaty zebrano i poddano analizie metodami ICP i AAS. Po zastosowaniu porcji roztworu odpowiadającej jednej objętości porów, zarejestrowano w odcieku silny pik alkaliczny i siarczanowy, będący skutkiem wymiany jonowej z roztworem. Następnie większość stężeń w eluatach była stabilna, ale ich wartości były niższe niż wcześniej. Po okresie suszenia uwalnianie K, S, i P w 2 z 3 przypadków uległo zwiększeniu, podczas gdy uwalnianie Fe i Mn spadło. Zanim eluaty trafiły do pojemników, strącana ochra oczyszczała roztwór z wielu substancji rozpuszczonych (Cr > Al > Pb > P > V > Fe), ale Mo-Sr-Mg-K-Se-B pozostały raczej niezmienione.

3

Response of rotifers to hydrochemical and biotic factors

Żurek R.

Oceanological and Hydrobiological Studies

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2006

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Vol. 35, No.2

121-139

EN

The zooplankton community in an open cast sulphur mine impoundment was investigated over two years. Complicated physical and chemical relationships in this pit ecosystem resulted in an atypical planktonic assemblage. Changes in the rotifer populations were examined over time and space in the pit ecosystem. Only 20 species of rotifers were identified in the impoundment. In winter, Polyarthra dolichoptera coexisted with P. bicerca; in spring, one of the dominant species was Keratella quadrata, while, in summer, Hexarthra fennica, Keratella cochlearis and Synchaeta tremula were all present. In autumn, Filinia longiseta dominated the population. On the border of the oxycline and beneath the thermocline lived Keratella testudo. Thermal and chemical stratification generated five variants of diurnal vertical migrations of planktonic animals including two typical, well-known patterns. Some species were able to penetrate the oxygen-free layer in the hypolimnion. These species were also resistant to low concentrations of hydrogen sulfide. Multidimensional scaling and correspondence analysis identified the following factors as important for rotifers: mineralization and the presence of sulfide with hydrogen sulfide, as well as biotic (predators) or the life supporting parameters: temperature, oxygen. Toxic compounds present in the water, especially sulfides or its derivates, were probably responsible for deformation of the rotifers’ spines in 0.1% of the population.

4

Porównanie wyników symulacyji migracji pionowej zanieczyszczeń ropopochodnych w gruncie z rezultatami badań laboratoryjnych

Fąfara Z.

Zeszyty Naukowe. Górnictwo / Politechnika Śląska

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2005

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z. 267

71-76

PL

W pracy przedstawiono wyniki symulacji migracji etyliny w środowisku gruntowo-wodnym, które porównano z uzyskanymi rezultatami badań laboratoryjnych wykonanych na przygotowanym stanowisku pomiarowym. Rozważania dotyczą modelu gruntu piaszczystego. Oznaczone laboratoryjnie jego właściwości stanowią parametry dopasowania dla zrealizowanych obliczeń numerycznych. Przeprowadzana analiza pokazuje zgodność wyników eksperymentalnych i przewidywań symulacji komputerowej.

EN

The results of a simulation of migration of ethyl gasoline in a soil-water environment were compared with laboratory results obtained on a measurement post. A sandy soil model was considered in the studies. Its properties determined in a laboratory are fit parameters for numerical calculations. The analyses show to a good congruence of experimental and computer simulation results.