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Tytuł:
New experiences in dike construction with soil-ash composites and fine-grained dredged materials
Autorzy:
Duszyński, R.
Duszyńska, A.
Cantré, S.
Powiązania:
https://bibliotekanauki.pl/articles/178746.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
dike
ash
dredged material
Opis:
The supporting structure inside a coastal dike is often made of dredged non-uniform sand with good compaction properties. Due to the shortage of natural construction material for both coastal and river dikes and the surplus of different processed materials, new experiments were made with sand-ash mixtures and fine-grained dredged materials to replace both dike core and dike cover materials resulting in economical, environmentally friendly and sustainable dikes. Ash from EC Gdańsk and dredged sand from the Vistula river were mixed to form an engineering material used for dike construction. The optimum sand-ash composites were applied at a field test site to build a large-scale research dike. Fine-grained dredged materials from Germany were chosen to be applied in a second full-scale research dike in Rostock. All materials were investigated according to the standards for soil mechanical analysis. This includes basic soil properties, mechanical characteristics, such as grain-size distribution, compaction parameters, compressibility, shear strength, and water permeability. In the field, the infiltration of water into the dike body as well as the erosion resistance of the cover material against overflowing water was determined. Results of both laboratory and field testing are discussed in this paper. In conclusion, the mixing of bottom ash with mineral soil, such as relatively uniform dredged sand, fairly improves the geotechnical parameters of the composite, compared to the constituents. Depending on the composite, the materials may be suitable to build a dike core or an erosion-resistant dike cover.
Źródło:
Studia Geotechnica et Mechanica; 2017, 39, 4; 17-24
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineral phase transformation of wood and cereal pellets – electrical test and factsagetm calculations
Autorzy:
Gonzalez Valdes, L.
Nowak-Woźny, D.
Powiązania:
https://bibliotekanauki.pl/articles/134730.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
biomass
ash
slagging
fouling
Opis:
The fusion behaviour of biomass ash-forming materials is an important factor in assessing the propensity to form undesirable slag and fouling deposits in the boiler. The characteristics of the fuel used affect the extent and severity of the problem, thus growing efforts are put on finding reliable methods for its characterization. Combustion and co-combustion of biomass have gained popularity in combating climate change and reducing carbon dioxide emissions into the atmosphere. Nevertheless, biomass encompasses a wide range of different types and its use increases operational risks due to the diversity of the chemical composition. This study is based on characterising the mineral phase transformations of two kinds of biomass (wood pellets and cereal pellets) using various laboratory-based methods on fuel ashes. Measurements of changes in the electrical properties of the ash during the sintering process (dielectric loss factor) were performed using a QuadTech Plus 7600 bridge in the frequency range 500Hz - 1MHz. Thermodynamic analyses were performed by means of FactSage™ modelling. The results were compared with those of standard tests, AFT and oxide index calculations, which were employed to predict slagging and fouling propensities. The observed changes in dielectric loss depend on the frequency and temperature of sintering. FactSageTM thermodynamic equilibrium calculations proved very useful in predicting the ash melting behaviour and the chemical changes occurring in the ash. The existence of a melt phase, occurring at even lower temperatures of those given by the AFT, is in accordance with the high slagging and fouling hazards predicted by empirical indices.
Źródło:
Technical Issues; 2016, 3; 126-134
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Phytotoxkit in the quick assessment of ashes suitability as fertilizers in sorghum crops
Autorzy:
Romanowska-Duda, Z.
Janas, R.
Grzesik, M.
Powiązania:
https://bibliotekanauki.pl/articles/2082497.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
ash
sorghum
Jerusalem artichoke
growth
Opis:
The aim of the research was to check the suitability of the Phytotoxkit test for quick assessment of usefulness of ashes from the combustion of sorghum and Jerusalem artichoke biomass as fertilizers in the cultivation of energy crops. Seeds of Sorghum bicolor L. were placed in the Phytotoxkit-plates, filled with Alonet Substrate KS (Latvia) and containing 0-100% of ash from burnt sorghum and Jerusalem artichoke plants. Based on daily measurements under greenhouse conditions, dynamics of seed germination, growth speed of shoots and roots, their fresh and dry biomass, index of chlorophyll content and parameters of gas exchange were evaluated. The results indicated that the modified Phytotoxkit biotest could be useful for quick assessment of ashes usefulness as fertilizers, it can be performed under greenhouse conditions regardless of the growing season and may be an alternative to laborious and long-term field trials. Biotest showed that the studied ashes, used in the proper dosages, improved seed germination, plant growth and biomass yield. These events were associated with increased index of chlorophyll content in leaves, net photosynthesis, stomatal conductivity, transpiration and proportionally decreased concentration of intercellular CO2. This indicate, that the studied ashes can be used as fertilizers in sorghum crops.
Źródło:
International Agrophysics; 2019, 33, 2; 145-152
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sposób zagospodarowania odpadów paleniskowych z Elektrowni Turów i problemy z tym związane
Method of disposal of combustion wastes coming from Turow Power Station and related problems
Autorzy:
Rzepecki, K.
Powiązania:
https://bibliotekanauki.pl/articles/349033.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
popiół
odpady paleniskowe
ash
combustion wastes
Opis:
W procesie produkcji energii elektrycznej w elektrowni cieplnej opalanej węglem brunatnym powstają znaczne ilości odpadów paleniskowych czyli popiołów z produktami odsiarczania spalin (ubocznych produktów spalania). Własności tych popiołów z produktami odsiarczania w dużym stopniu zależą od technologii spalania węgla w kotłach i od technologii odsiarczania spalin. Niektóre własności ubocznych produktów spalania są korzystne dla gospodarczego wykorzystania. W artykule przedstawiono informację o własnościach różnych odpadów paleniskowych z Elektrowni Turów. Przedstawiono historię zagospodarowania tych odpadów w ciągu wielu lat eksploatacji Elektrowni Turów i aktualne sposoby wykorzystania. Na koniec zaprezentowano problemy, jakie występują w procesie zagospodarowania odpadów paleniskowych z PGE GiEK SA Oddział Elektrownia Turów.
In the process of electricity production in brown coal-fired, thermal power plant significant quantities of combustion wastes are created. The wastes are ashes (by-products of combustion) which contain products of flue gas desulfurization. Properties of ashes containing products of flue gas desulfurization depend on both coal combustion process in boilers and flue gas desulphurization process. There are some properties of combustion by-products which are suitable for commercial utilization. The present paper presents information on the properties of various combustion wastes coming from the Turow Power Station. Both the history of waste management over years of operation of Turow Power Plant and current utilization practices are included as well. The paper is concluded with description of presents problems which appear in the process of waste management in PGE GiEK SA Division Turow Power Plant.
Źródło:
Górnictwo i Geoinżynieria; 2011, 35, 3; 307-314
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Content of Heavy Metals in Waste as an Indicator Determining the Possibilities of Their Agricultural Use
Autorzy:
Łapiński, Dawid
Wiater, Józefa
Szatyłowicz, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/123784.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heavy metals
digestate
ash
dried sludge
Opis:
The aim of the study was to evaluate the available waste in view of the heavy metals and fractions thereof. Three waste materials were analyzed in the work, namely dried, granular sludge, digestate from agricultural biogas plant and ash after combustion of biomass from the combined heat and power plant, in terms of the content of heavy metals in them. Their mobility through fractional analysis was determined and the possibilities of their agricultural use were assessed. The analyzed waste was varied due to the pH. Biomass ashes had the highest pH and it was alkaline. The pH of the dried precipitate was neutral and digestate was slightly alkaline. In the analyzed wastes, the content of permissible concentrations of heavy metals determined in the Regulation of the Minister of the Environment was not exceeded. The content of individual elements varied and depends on the type of waste tested. The conducted sequential analysis showed that various metal fractions are present in the tested wastes. The content of heavy metals in individual factions was varied and the content of mobile and potentially mobile fractions, i.e. metals of fractions I and II, was lower compared to the non-mobile fractions III and IV.
Źródło:
Journal of Ecological Engineering; 2019, 20, 4; 225-230
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radial growth of pedunculate oak and European ash on active river terraces. Hydrologic and climatic controls
Autorzy:
Okoński, B.
Powiązania:
https://bibliotekanauki.pl/articles/100989.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
oak
ash
floodplain forest
radial growth
Opis:
The aim of this study was (1) to assess relationships binding hydroclimatic factors and radial growth of pedunculate oak and European ash growing on active terraces of river valleys; (2) to compare the growth reaction of these species from this location. Research site was located in a floodplain valley, within mid-course of the lowland section of the Warta River in the Lasy Czeszewskie Forest, Poland. The Warta River (length 808 km, basin area: 54,529 km2 ) is a mid-size European river, a tributary of the Odra River draining the North European Plain to the Baltic Sea. The sampled forest stand was an old growth composed of pedunculate oak and European ash mixed with other mature tree species. The main conclusions are: (1) ash in comparison to oak growing on the same site located on floodplains appeared to be both more sensitive to hydroclimatical features and less ecologically flexible as far as monthly pattern of water requirements is concerned, therefore adaptation to changing climatic conditions and drought may be a greater ecological challenge for ash than for oak in river valleys; (2) streamflow could be considered as the parameter that substituted precipitation well, or even was more important than precipitation, as far as availability of water for development of tree rings of ash and oak growing on active terraces of river valleys is concerned; however, the role of streamflow in radial growth developing decreased substantially during 20th century; (3) Standardized Precipitation Evapotranspiration Index (SPEI) as a measure of drought is a prospective parameter in dendroecological analysis, since it conveys real availability of water for trees.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2017, III/1; 1075-1091
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Środa Popielcowa w liturgii Kościoła i obrzędowości ludowej. Tradycja a współczesność
Ash Wednesday in Church Liturgy and Folk Rituals. Tradition and Modernity
Autorzy:
Kupisiński, Zdzisław
Powiązania:
https://bibliotekanauki.pl/articles/1684002.pdf
Data publikacji:
2020-09-29
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
popiół
Środa Popielcowa
praktyki pokutne
post
pobożność ludowa
ash
Ash Wednesday
penitential practices
fasting
folk piety
Opis:
Tematem artykułu jest prezentacja Środy Popielcowej w liturgii Kościoła oraz analiza sposobu przeżywania tego dnia w tradycji i pobożności ludowej, ze szczególnym uwzględnieniem zwyczajów i obrzędów. Autor, odwołując się do dokumentów Kościoła, zwraca uwagę na wartości płynące z połączenia dwóch form kultu, jakimi są liturgia i pobożność ludowa. W opracowaniu zagadnienia autor korzystał z literatury przedmiotu, a także prowadzonych przez siebie w subregionach opoczyńskim i radomskim stacjonarnych etnograficznych badań terenowych nad obrzędowością doroczną (lata 1990–1994) oraz funeralną (lata 1997–2006), w ostatnich latach posługiwał się również metodą obserwacji uczestniczącej.  Artykuł podzielony został na dwie części – w pierwszej autor przywołuje genezę liturgii Środy Popielcowej i historię towarzyszących jej obrzędów religijnych, charakteryzuje symbolikę popiołu (i jego obecność w praktykach pokutnych różnych tradycji), koncentrując się przede wszystkim na zwyczajach panujących niegdyś na polskiej wsi – uczestnictwo w liturgii, charakterystyczne postne posiłki, pokutny ubiór. Część druga opracowania ukazuje Środę Popielcową jako datę graniczną pomiędzy okresem karnawału i Wielkiego Postu, niegdyś był to bowiem dzień praktykowania ludowych obrzędów o rozrywkowym charakterze (np. „kłoda popielcowa” czy „babski comber”). Wiele z nich nawiązywało do dawnych przedchrześcijańskich obrzędów wiosennych, a ich kultywowanie miało na celu utylitarne korzyści. Autor ukazuje przemiany, jakie zaszły i wciąż zachodzą w polskim społeczeństwie w percepcji pierwszego dnia Wielkiego Postu. Podkreśla wymarcie wielu popularnych kiedyś obrzędów, wskazując również na aktualność i żywotność zwyczaju posypywania głów popiołem, który wciąż najpełniej oddaje przekaz Środy Popielcowej.
The aim of the article is to present Ash Wednesday in the liturgy of the Church and to analyze the way of how this day is experienced in the tradition and folk piety, with particular emphasis on customs and rituals. The author makes a reference to the Church’s documents and draws attention to the values that result from the integration of two forms of worship, i. e. liturgy and folk piety. The author drew on the literature on the subject, as well as his stationary ethnographic fieldwork on annual (1990–1994) and funeral rituals (1997–2006) conducted in the Opoczno and Radom subregions. In recent years he also used the method of participant observation. The article is divided into two parts. In the first one the author recalls the genesis of the Ash Wednesday liturgy and the history of religious rituals performed on that occasion; further he discusses the symbolism of ashes, focusing mainly on the customs that once prevailed in the Polish countryside, namely participation in the liturgy, characteristic fasting meals and penitential clothing. The second part of the study presents Ash Wednesday as the cut-off date between the carnival and Lent period; in the past it was a day of practicing folk rituals of an entertaining nature (e.g. dragging an “Ash Wednesday log” or a “women’s comber – fun”). Many of these customs evoked old pre-Christian Spring rituals, and their practice was for utilitarian gains. The author shows the changes that had taken and are still taking place in Polish society in the perception of the first day of Lent. Moreover, he emphasizes the disappearance of many once popular ceremonies and rituals, highlighting at the same time the relevance and durability of the custom of putting ashes on heads, which still best reflects the meaning of Ash Wednesday.
Źródło:
Roczniki Teologiczne; 2020, 67, 9; 127-140
2353-7272
Pojawia się w:
Roczniki Teologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of ash and compost on the content and bioaccumulation of selected heavy metals
Autorzy:
Możdżer, Ewa
Cybulska, Krystyna
Krzyśko-Łupicka, Teresa
Meller, Edward
Powiązania:
https://bibliotekanauki.pl/articles/779098.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
ash
compost
heavy metals
bioaccumulation
test plants
Opis:
Therefore the carried out study aimed at determination of the effect of high-calcium brown coal ash and compost being produced from municipal sewage sludge on the content and bioaccumulation of heavy metals in potato tubers, wheat grains and rapeseeds during a three-year period. Rapeseeds contained most Cd whereas wheat rains less. Potato tubers, wheat grains and rapeseeds contained more Mn, Ni and Zn in the fertilization objects with municipal sewage sludge with or without coal ash and compared to those where calcium carbonate or coal ash had been introduced into the soil at a dose corresponding to 1.5 Mg CaO · ha−1  at the beginning of this study. Differences in the Mn, Ni and Zn contents in test plants between the fertilization objects with sewage sludge of with and without addition of ash were not significant.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 2; 20-25
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gospodarcze wykorzystanie popiołów po spaleniu węgla kamiennego i biomasy
Economic use of ashes after the combustion of hard coal and biomass
Autorzy:
Markowski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/530932.pdf
Data publikacji:
2019-03-06
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Raciborzu
Tematy:
ash
biomass
hard coal
economy
sustainable development
Opis:
The increasing amount of ashes generated necessitates their re-use to avoid storage. The use of ashes requires learning their physical and chemical composition, which is influenced by the type of fuel burned. The ability to manage ashes is strongly influenced by the way they are recovered and disposed of. Ashes are used in mining, agriculture, construction or waste management. Road engineering seems to be a future area due to the large amount of investments in this area. Large economic effects are obtained due to recovery of ashes and creation of raw materials or products based thereon. In this case, research on the development and implementation of new directions for their recovery and the implementation of indispensable investments are of particular importance. Ash management has a future ahead of us through re-use. The potential should be used taking into account the principle of sustainable development.
Źródło:
Eunomia – Rozwój Zrównoważony – Sustainable Development; 2018, 2(95); 71-80
1897-2349
2657-5760
Pojawia się w:
Eunomia – Rozwój Zrównoważony – Sustainable Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorpcja barwników z roztworów wodnych na popiołach
Adsorption of dyes from aqueous solutions on ashes
Autorzy:
Filipkowska, U.
Janczukowicz, W.
Rodziewicz, J.
Szmit, R.
Powiązania:
https://bibliotekanauki.pl/articles/1819523.pdf
Data publikacji:
2011
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
barwnik
popiół
roztwór wodny
aqueous solution
ash
dye
Opis:
Celem niniejszej pracy było określenie efektywności adsorpcji barwników anionowych i kationowych z roztworów wodnych na popiołach pochodzących, z dwóch różnych źródeł: ze spalania osadów ściekowych w Grupowej Oczyszczalni Ścieków "Dębogórze" w Gdyni i ze spalania węgla kamiennego w Olsztyńskiej Elektrowni Ciepłowniczej (OZOS). Jako adsorbaty zastosowane zostały barwniki rozpuszczalne w wodzie: z wytworzeniem barwnego kationu - Basic Green 4 (barwnik zasadowy) oraz z wytworzeniem barwnego anionu - Reactive Black 5 (barwnik helaktynowy winylosulfonylowy.
This study was conducted with water-soluble dyes used as sorbates: with the formation of color cation - Basic Green 4 (basic dye) and with the formation of color anion - Reactive Black 5 (helactine vinyl sulfone dye). Its objective was to investigate possibilities of dyes adsorption from aqueous solutions on ashes. The scope of the study included a comparison of adsorption effective-ness of two dyes originating from the textile industry: Reactive Black 5 (RB5) and Basic Green 4 (BG4) by fly ashes of two different origins: from coal combustion at the Olsztyn Thermal Power Station (OZOS), from combustion of sewage sludge originating from Group Wastewater Treatment Plant "Dębogórze" in Gdynia. Results achieved in the study demonstrated that the effectiveness of the adsorption process was determined by the type of dye and adsorbent as well as by pH value of the aqueous solution. In the case of the anionic dye RB 5, the increase in pH was accompanied by diminishing adsorption effectiveness, whereas an opposite tendency was observed in the case of the cationic dye BG4 when the increase in pH value resulted in enhanced dye removal. The fly ashes applied in the research, both from the Thermal Power Station OZOS and from combustion of activated sludge, were characterized by a high effectiveness of cationic dye removal. In the case of the cationic dye BG 4, the highest adsorption capacity (b) accounting for 500.5 mg/g was achieved on fly ashes from the Thermal Power Station at pH = 9.0. In turn, the effectiveness of anionic dye RB 5 removal on both sorbents was at a similar, considerably lower level (0.6÷4%). In the case of this dye, the highest adsorption capacity (b) reaching 6 mg/g d.m. was achieved on ashes from the sludge at pH 3.0, whereas the lowest one ? 0.1 mg/g d.m. - at pH 9.0 on fly ashes from the Thermal Power Station.
Źródło:
Rocznik Ochrona Środowiska; 2011, Tom 13; 1173-1184
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Fusion Characteristics of Ashes from Lignin and the Coke Breeze
Autorzy:
Fröhlichová, M.
Findorák, R.
Legemza, J.
Džupková, M.
Powiązania:
https://bibliotekanauki.pl/articles/352254.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biomass
ash
fuel
mineral phases
iron ore sinter
Opis:
In this paper are presented results of study fusion characteristics of the biomass ashes from the hydrolyzed lignin and the ashes from the coke breeze. The hydrolyzed lignin ashes were compared with the coke breeze ashes i.e. with a fossil fuel. These ashes were prepared in muffle furnace at the temperature of 550°C (hydrolyzed lignin) and 850°C (coke breeze). Biomass (the hydrolyzed lignin) represents the new fuels for sintering process and an attractive way to decrease CO2 emissions from the energy production. The characterization methods were the following: standard fuel characterization analyses, chemical and mineralogical composition of the ashes and phase analyses of the ashes of biomass and the coke breeze. These ashes were prepared by the same method. Characterisation of the ashes samples was conducted by means of X-ray fluorescence (XRF), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Quantitative analysis of the crystalline and amorphous phases in each of the ash samples were carried out using the Rietveld method. The dominant phase of the ash from the coke breeze was mullite (Al6 Si2 O13 ). SiO2 is the dominant phase of the ash from the hydrolyzed lignin.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1523-1530
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ashes from Sewage Sludge and Bottom Sediments as a Source of Bioavailable Phosphorus
Autorzy:
Ciesielczuk, T.
Rosik-Dulewska, C.
Poluszyńska, J.
Ślęzak, E.
Łuczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/125013.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
phosphorus
bioavailability
ash
sewage sludge
bottom sediments
extraction
Opis:
Phosphorus is an element necessary for the growth of plants. As phosphate rock gets depleted, it becomes an increasingly scarce resource. Therefore, it seems necessary to implement simple methods of cheap and effective phosphorus recovery from waste. The ashes of municipal sewage sludge and bottom sediments constitute particularly valuable sources of phosphorus. However, these materials usually carry significant amounts of pollutants, including heavy metals. Optimization of ash phosphorus sequential extraction methods from a thermal conversion of sewage sludge and bottom sediments allows to select an effective and simple technology of phosphorus recovery, while maintaining low heavy metal pollution, which is one of the main restrictions in use of ashes. Determination of an amount of bioavailable phosphorus is therefore a basis for estimation of the possibility of using it from waste. Extraction using the Golterman method or shaking out with calcium lactate or Trougs reagent indicates that the ashes from sewage sludge and bottom sediments are rich sources of bioavailable phosphorus, which could find use under field conditions as a viable alternative to fertilizers containing fossil phosphorus.
Źródło:
Journal of Ecological Engineering; 2018, 19, 4; 88-94
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie korelacji pomiędzy przewodnością elektryczną i zawartością popiołu w wybranych miodach pszczelich
Study of correlation between electrical conductivity and ash content in some bee honeys
Autorzy:
Majewska, E.
Kowalska, J.
Powiązania:
https://bibliotekanauki.pl/articles/36301.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
miod pszczeli
przewodnosc elektryczna
popiol
zawartosc popiolu
sklad chemiczny
korelacja
honey bee
electrical conductance
ash
ash content
chemical composition
correlation
Opis:
Celem pracy było wyznaczenie współzależności między zawartością popiołu i przewodnością elektryczną wybranych miodów pszczelich. Do badań wykorzystano 46 próbek miodów pszczelich różnych odmian: akacjowy (2), gryczany (4), lipowy (3), rzepakowy (6), wielokwiatowy (13), wrzosowy (2), nektarowo-spadziowy (3), spadziowy (5), malinowy (1), mniszkowy (1), eukaliptusowy (1), kasztanowy (1), lawendowy (1), pomarańczowy (1), rozmarynowy (1) i jedwabny (1). Próbki miodów zakupiono w warszawskich sklepach detalicznych lub pozyskano bezpośrednio od pszczelarza. Zawartość popiołu w analizowanych próbkach mieściła się w granicach od 0,03% do 0,99%, natomiast przewodność elektryczna kształtowała się od 0,10 mS·cm-1 do 1,52 mS·cm-1. Wyniki badań pozwoliły stwierdzić, iż ścisła zależność pomiędzy przewodnością właściwą a zawartością popiołu sugeruje równoważność obu metod do wyznaczania sumy składników mineralnych, dzięki czemu można znacznie skrócić czas analiz wykorzystując konduktometrię do oznaczania zawartości popiołu.
The aim of this study was to determine the relationship between ash content and electrical conductivity of different types of honey. The study used 49 samples of different varieties of bee honey: acacia (2), buckwheat (4), lime (3), rape (6), multifloral (13), heather (2), honey-dew (3), honeydew (5), raspberry (1), dandelion (1), eucalyptus (1), chestnut (1), lavender (1), orange (1), rosemary (1) and silk (1). Honey samples were purchased in retail stores in Warsaw or obtained directly from a beekeeper. Ash content in the analysed samples ranged from 0.03% to 0.99%, while the conductivity varied from 0.10 mS cm-1 to 1.52 mS cm-1. The results allow for the conclusion that the close correlation between conductivity and ash content suggests equivalence of both methods to determine the amount of minerals, which permits a significant reduction of the time of analysis using conductometric analysis to determine the ash content.
Źródło:
Acta Agrophysica; 2011, 17, 2[189]
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flotation kinetics and separation selectivity of coal size fractions
Autorzy:
Li, Y.
Zhao, W.
Gui, X.
Zhang, X.
Powiązania:
https://bibliotekanauki.pl/articles/110676.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coal
flotation rate
combustible matter recovery
ash
particle size
Opis:
Flotation recovery and kinetics for three size fractions of coal were investigated. Flotation of combustible matter recovery was approximated with the first order kinetic equation while flotation of the ash forming minerals with the second order equation. Next, the equations for each size fraction were combined and a formula was obtained which was used for approximation of the experimental results using the so-called Fuerstenau upgrading curve, which relates the recovery of combustible matter recovery and recovery of ash forming minerals, both in concentrate. The Fuerstenau upgrading plot showed that the best selectivity was obtained for the middle size fraction of 0.25–0.075 mm, while the flotation selectivity of larger 0.5–0.25 mm and smaller –0.075 mm particles was diminished. This finding agrees with many other investigations.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 387-395
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is the biochar produced from sewage sludge a good quality solid fuel?
Autorzy:
Pulka, J.
Wiśniewski, D.
Gołaszewski, J.
Białowiec, A.
Powiązania:
https://bibliotekanauki.pl/articles/204734.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
torrefaction
sewage sludge
biochar
calorific value
solid fuel
ash
Opis:
The influence of sewage sludge torrefaction temperature on fuel properties was investigated. Non-lignocellulosic waste thermal treatment experiment was conducted within 1 h residence time, under the following temperatures: 200, 220, 240, 260, 280 and 300°C. Sawdust was used as lignocellulosic reference material. The following parameters of biochar have been measured: moisture, higher heating value, ash content, volatile compounds and sulfur content. Sawdust biochar has been confirmed to be a good quality solid fuel. High ash and sulfur content may be an obstacle for biochar energy reuse. The best temperature profile for sawdust torrefaction and fuel production for 1 h residence time was 220°C. At this temperature the product contained 84% of initial energy while decreased the mass by 25%. The best temperature profile for sewage sludge was 240°C. The energy residue was 91% and the mass residue was 85%. Higher temperatures in both cases caused excessive mass and energy losses.
Źródło:
Archives of Environmental Protection; 2016, 42, 4; 125-134
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 89

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