Wyniki wyszukiwania - BazTech

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The Influence of Atmospheric and Subsoil Impact on the Evaporation Process During Firefighter's Events

Polanczyk Andrzej, Piechota-Polanczyk Aleksandra, Majder-Lopatka Malgorzata, Dmochowska Anna, Salamonowicz Zdzislaw

Rocznik Ochrona Środowiska

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2021

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Tom 23

420--433

EN

The influence of sun rays, wind speed, and different type of subsoil on the evaporation process was analyzed. A dedicated experimental set-up for investigation of evaporation process of three liquids (ethanol, petrol and tap water) deposited on glass and sand was created. Results indicated that for porous surfaces wind decreased the amount of evaporated liquids. After substitution of wind with sun rays for porous surface evaporation process increased for ethanol and petrol, respectively. Finally, the influence of both wind and sun rays indicated a 1% and 5% decrease of evaporation intensity for tap water and petrol, respectively. While, a 2% increase of evaporated liquid was observed for ethanol. It was noticed that application of porous surface caused the highest improvement of evaporation process for petrol and tap water, while the lowest for ethanol. Moreover, application of wind together with porous surface increased the intensity of evaporation for all analyzed liquids.

2

Numerical Simulation of Emergency Release of Liquid Petroleum Gas on a Car Gas Station

Salamonowicz Zdzislaw, Majder-Lopatka Malgorzata, Dmochowska Anna, Piechota-Polanczyk Aleksandra, Polanczyk Andrzej

Rocznik Ochrona Środowiska

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2021

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Tom 23

65--77

EN

LPG storage tanks may be seriously threatened by a fire coming from nearby fuels or by leakage appearance. The aim of the study was to prepare a three-dimensional model of LPG release on a car gas station under different environmental conditions. CFD simulations of liquid and gas phase release from a tank localized on a car gas station was performed. First, ALOHA software was applied to determine mass flow rate, while Ansys software was used to determine the shape and size of hazardous zone. To reflect real condition atmospheric stability classes were applied. It was observed that for classes A-D the hazardous zone was decreasing. While, for E and F class the range was increased. It was noticed that the location of the leakage affects the extent of the danger zone. For the leaking below the liquid surface analyzed LPG has liquid form. While, for the leaking above the liquid surface analyzed LPG has gas form. Furthermore, for liquid leakage the largest hazard zone of release was observed.

3

Heavy Metal Emissions from Linear Sources and Polluted Soil in The Capital City of Poland

Dmochowska Anna, Majder-Lopatka Malgorzata, Salamonowicz Zdzislaw, Piechota-Polanczyk Aleksandra, Polanczyk Andrzej

Rocznik Ochrona Środowiska

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2021

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Tom 23

94--105

EN

Human activities such as transport contribute to the environmental degradation. Therefore, the aim of the study was to determine the level of contamination of soils, from different districts of big cities of central Europe, with heavy metals: zinc, lead, and nickel. The samples were taken from the top, sodded soil layer. Each single sample weigh was about 1 kg taken from 1 m2 measuring station. Soil samples were dried at room temperature. The airborne dry soil was thoroughly mixed and sieved through a 1 mm nylon sieve. The study included analysis of which type of metals is washed out under the influence of abiotic factors (bioavailable forms) and demonstrating how spatial development affects the accumulation of selected heavy metals in the soil. The results indicated that heavy metals emitted to the ground layer of the atmosphere accumulate in the immediate vicinity of communication routes. Moreover, based on the analysis of interrelationships of zinc, lead, and nickel concentrations, it has been shown that there is a common source of their emission to soil. Furthermore, the thesis that the concentration of metals was dependent on the soil reaction was not confirmed.