Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 13

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
7
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Energy biomass characteristics of chosen plants

81%
The chosen energy plants species: willow, mallow and Miscanthus are presented. Result of analysis of combustion heat and heating value of these species biomass indicate on possibility of their utilization as fuel for combustion and energy and heat production.
Green-belt shielding seems to be the right solution for protection against the spread of automotive environmental pollution, particularly when it comes to large areas. Roadside greenery fulfills a range of various functions – both natural and aesthetic, while also offering great potential for environmental protection. The aim of this study was to determine the content of zinc and copper in the soil collected from a roadside, as well as in soil collected from immediate surrounding areas where Virginia mallow (Sida hermaphrodita Rusby) was grown as a form of biological roadside screen barrier, and to examine how the vegetation in this area may limit the spread of automotive environmental pollution. Furthermore, the content of the researched elements in the separate parts of the plants (leaves, stems, roots) collected in varying proximity of the road was specified. The highest concentration of copper was found in the leaves and roots of the Virginia mallow, whereas that of zinc was in the leaves of the plant.
Wood combustion on a local scale may cause the emissions of more than 100 different toxic and carcinogenic substances. Therefore, it appears that biomass combustion paradoxically involves the risk of environmental contamination and poses a threat to human health. This occurs under unfavorable conditions or due to the use of combustion technology unsuitable for a given fuel. Fuel combustion in low power boilers is carried out with the use of fuels with highly diversified technical and elementary parameters, and the economic aspect is for households ever more frequently to be a determinant of the form and quality of the combusted fuel, regardless of the boilers within which the fuel undergoes thermal conversion. The aim of the research was to determine the concentration of contaminations emitted during the combustion of pellets made of Virginia mallow biomass in a 32 kW boiler with automatic fuel loading adapted for wood pellet combustion on a test bench. The concentrations of 16 polycyclic aromatic hydrocarbon PAHs and benzo(a)pyrene B(a)P was determined, the indicators of emitted contaminations were specified, and the concentration of VOC (methane, ethane, ethylene, propane, propylene, n-butane, and pentane) in flue gases was defined. The determined indicators of emission for 16 PAHs equaled: 2.9 mg·kg⁻¹, i.e. 170.0 mg·GJ⁻¹, and for B(a)P 0.03 mg·kg⁻¹, i.e. 1.8 mg·GJ⁻¹.
Taking into consideration the fact that used oils are considered hazardous and extremely toxic, their subsequent use creates a real threat to the environment. The only effective measure for protecting the natural environment from used oil contamination is collection and controlled utilization. Only appropriate used oil management can guarantee minimal environmental contamination and prevent its irreversible degradation. The aim of our study was to determine the content of select heavy metal elements in used engine oils originating from agricultural tractors and agricultural machines of varying mileage. The tests were carried out by using the HD XRF method. The researched samples showed a high content of zinc remaining at 726- 1,389 mg·kg⁻¹. The contents of molybdenum, iron, and copper also were high, at Mo 360-689 mg·kg⁻¹, Fe 16.5- 267 mg·kg⁻¹, and Cu 4.63-76.87 mg·kg⁻¹. Low nickel, manganese, chromium, and lead contents were found in the ranges: Ni 0.14-0.75 mg·kg⁻¹, Mn 0.41-4.27 mg·kg⁻¹, Cr 0.36-10.66 mg·kg⁻¹, and Pb 0.9-13.71 mg·kg⁻¹. Mercury and cadmium were not found in the tested oils.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.