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Wyszukujesz frazę "Contamination" wg kryterium: Temat


Tytuł:
Soil polychemical contamination on Beliy Island as key background and reference plot for Yamal region
Autorzy:
Abakumov, Evgeny
Shamilishviliy, Georgy
Yurtaev, Andrey
Powiązania:
https://bibliotekanauki.pl/articles/2042166.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
polycyclic aromatic compounds
reference landscapes
soil contamination
trace elements
Yamal
Źródło:
Polish Polar Research; 2017, 38, 3; 313-332
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Tubercle Mycobacteria and Other Contaminants in Metalworking Fluids from Small Turneries
Autorzy:
Abu Shaqra, Qasem
Al Groom, Rania
Al-Gabbiesh, Ahmad
Powiązania:
https://bibliotekanauki.pl/articles/2086350.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
metalworking fluid
microbial contamination
small turnery
non-tuberculous mycobacteria
Opis:
Non-Tuberculous Mycobacteria (NTM) have frequently been isolated from metalworking fluids (MWFs) used in large machining industries. This paper concerns the microbial detection, particularly NTM in MWFs employed in small metalworking shops. A total of 21 samples were collected from different turneries and were tested for several microbiological parameters. A total microbial count above 106 CFU ml-1 was observed in 66.6% (14/21) of samples and none of the samples had the count <102 CFU ml-1. The dominant contaminants were Gram-negative bacteria with 90.5% (19/21) of samples revealing the presence of Pseudomonas aeruginosa. Sulfate Reducing Bacteria (SRB) were detected in 52.4% (11/21) of samples, whereas NTM were recovered from 14.3% (3/21) of samples only. Two species of NTM were identified by biochemical reactions as Mycobacterium chelonae and Mycobacterium abscessus. It was concluded that MWFs used in small turneries are usually contaminated with Gram-negative bacteria and SRB but NTM are not common contaminants of these fluids.
Źródło:
Journal of Ecological Engineering; 2022, 23, 4; 315--324
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microbiological contamination of food
Mikrobiologiczne zanieczyszczenia żywności
Autorzy:
Adamus-Bialek, W.
Wawszczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/388568.pdf
Data publikacji:
2015
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
food contamination
epidemiology
skażenie żywności
epidemiologia
Opis:
The aim of the study was the statistical analysis of available data of microbiological investigation of food products. Data for the analysis were provided by the sanitary-epidemiological stations in Swietokrzyskie voivodship in 2008–2011. The different types of food products (meat, dairy products, grains products, fish, vegetables, fruit, water, soft drinks, vegetable fats, herbs, coffee, tea, cocoa, foodstuffs intended for particular nutritional uses and nutritional supplements) were studied. The research material was obtained from the products of national origin, food imported with distinguishing between the products originating from the European Union. The presence of Listeria monocytogenes, Escherichia coli, Salmonella spp. and Yersinia enterocolitica was analyzed. Escherichia coli and Yersinia enterocolitica were detected sporadically. Listeria monocytogenes was detected the most frequently in confectionery products, convenience foods, milk and milk products, most rarely in fruits and vegetables. It has been shown that the most frequent pathogens in food samples were Salmonella spp., also responsible for the largest number of food poisoning in Poland. Salmonella spp. were detected primarily in domestic products. The increase of the prevalence of those bacteria was observed during next years (2008–2011). It should be emphasized, that all of the analyzed samples contained at least one of the studied species. Food contamination may cause an increase of food poisoning incidents as well as others diseases caused by these pathogenic bacteria. It is important to observe rules of hygiene during the production, preparation and consumption of food products, but this problem is more complex.
Celem pracy była analiza produktów żywnościowych na podstawie obecności patogennych mikroorganizmów. Dane do analizy zostały dostarczone przez stacje sanitarno-epidemiologiczne w województwie świętokrzyskim w latach 2008–2011. Badano różne rodzaje produktów spożywczych (mięso, produkty mleczne, produkty zboża, ryby, warzywa, owoce, woda butelkowana, napoje bezalkoholowe, tłuszcze roślinne, zioła, kawa, herbata, kakao, środki spożywcze specjalnego przeznaczenia żywieniowego oraz suplementy diety). Materiał badawczy pochodził z produktów pochodzenia krajowego oraz z importu z rozróżnieniem produktów pochodzących z Unii Europejskiej. Analizowano obecność takich bakterii, jak: Listeria monocytogenes, Escherichia coli, Salmonella spp. i Yersinia enterocolitica. Escherichia coli i Yersinia enterocolitica były wykrywane sporadycznie. Wykazano, że najczęściej występującym patogenem w próbkach żywnościowych pochodzenia krajowego były bakterie z grupy Salmonella spp., które są odpowiedzialne za największą liczbę zatruć pokarmowych w Polsce. Równie często wykrywano Listeria monocytogenes, szczególnie w produktach cukierniczych, garmażeryjnych, mleku i produktach mlecznych, a najrzadziej w owocach i warzywach. Niestety zaobserwowano wzrost częstości występowania tych bakterii w kolejnych latach (2008–2011). Należy podkreślić, że wszystkie analizowane próbki zawierały co najmniej jeden z badanych gatunków. Zanieczyszczenie żywności może spowodować wzrost przypadków zatruć pokarmowych, a także innych chorób wywołanych przez te bakterie chorobotwórcze. Ważne jest, aby przestrzegać zasad higieny podczas produkcji, przygotowania i konsumpcji produktów żywnościowych. Problem ten jest jednak bardziej złożony.
Źródło:
Ecological Chemistry and Engineering. A; 2015, 22, 4; 509-516
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production stages, microbiological risk and benefits on health of herbal teas
Autorzy:
Akduman, G.
Korkmaz, I.O.
Powiązania:
https://bibliotekanauki.pl/articles/2049211.pdf
Data publikacji:
2020
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
herbal tea
production stage
health
contamination
antioxidant activity
microbiological risk
benefit
herbata ziołowa
zdrowie
zanieczyszczenie
działanie antyoksydacyjne
Opis:
Plants have been used to prepare herbal infusions for centuries. Production of herbal tea consists of several steps, beginning with harvesting, cleaning form residues, drying, storage of herb in a suitable material, grinding, and blending. Te plants grow in different regions and climatic conditions, varying by their physical properties. They are consumed for different purposes and due to their chemical constituents. Many of them have therapeutic effects. Besides their various benefits and even antimicrobial effects, they also carry some microorganisms. Thus, the botanical characteristics and effects on the health of frequently consumed herbal teas and recommendations on their consumption with considered microbial risks are reviewed in this article.
Źródło:
Herba Polonica; 2020, 66, 4; 68-78
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison Study of Water Quality Produced from a Conventional Water Treatment Plant and a Number of Compact Units
Autorzy:
Al Saleh, Hadeel Ali
Powiązania:
https://bibliotekanauki.pl/articles/1838410.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
water quality
compact unit
quality index
purification
contamination
Opis:
Water is very plentiful through the planet in general. Nevertheless, clean drinking water is not always accessible in the proper time or place for sufficient public or ecological use. The water significance is emphasized by the fact that in the past, great cultures have arisen near and along water bodies. Water quality of some purification complexes (compact units) in the Babylon Province (13 compact unit) as compared with Al-Hillah Al Mouahad Project (water treatment plant) was assessed by the Water Quality Index (WQI) methodology. WQI offers a particular number that states the overall water quality at a definite place and period based on many parameters concerning the quality of water. The water produced from the compact units was classified as "good water" according to the WQI classification with the values ranging from 85.4 in Bermana unit to 99.17 in Al-Muamera compact unit. Moreover, the research results showed that the water purification complexes work with efficiency, very close to the performance of large water purification projects and stations, and this means that it is possible to rely on them to obtain good drinking water quality, especially in small or remote areas.
Źródło:
Journal of Ecological Engineering; 2021, 22, 5; 258-262
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of Helix pomatia L. shells found in soils with varying degrees of contamination (southern Poland)
Autorzy:
Aleksander-Kwaterczak, U.
Gołas-Siarzewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/184460.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Helix pomatia
shell
metals
bioaccumulation
soil contamination
Opis:
Soil samples and snails – Helix pomatia Linnaeus, 1758 specimens were collected from the region of Małopolska. Research based on soil from this area showed a differentiated degree of environmental contamination, which influenced the composition of elements that build mollusc shells. Concentrations of Pb, Mn, Cd, Fe, Zn and Cu in the snail shells and soil varied between localities. The highest of these concentrations were found in the soil in the city of Cracow. They were higher than those measured in the regions outside the city, 7 times in the case of Cd, and up to 123 times higher for Cu. Positive association between soil pollution and shell contamination can be observed (rs ≈ 0.9). A high concentration of metals in the environment and their bioavailability causes long-term accumulation of these elements in Helix pomatia shells.
Źródło:
Geology, Geophysics and Environment; 2015, 41, 4; 299-309
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection and enumeration of Enteric bacteria associated with food handlers and surfaces of food manufacturing industry located in Hub city, Pakistan
Autorzy:
Ali, Razim
Hayat, Amir
Fatima, Madiha
Noman, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/1182928.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
enterobacteriaceae
foodborne microbes
hygiene
surface contamination
food handlers
e. coli
sanitation
Opis:
Foodborne microorganisms harbor and adheres itself to the food material and surrounding surfaces for a long time and influence the food quality and consumers health. Among these microbes the presence of Enteric indicator bacteria in food premises confers the indication of entero-pathogens, i.e. E. coli, Salmonella, Shigella and Campylobacters that could cause severe systemic infections in consumers. In this study, the hygienic status of confectionery and supplementary food processing facility was evaluated. A total of 10497 examinations were performed on 3499 swab samples collected from food premises and handlers for the analysis of Enteric indicator bacteria. From swabs, 1277 (12.2%) isolates were identified in which Enterobacteriaceae were found with higher frequency 604 (47.3%) followed by Coliforms 293 (30.8%) and Escherichia coli 280 (21.9%) respectively. The mean count (CFU/cm2) was found maximum for plain surfaces (floors, walls and door), while the lowest was for equipment and machinery. Overall isolates percent prevalence was determined where Enterobacteriaceae were 47%, Coliforms 31% and Escherichia coli 22%. Majority of the floor surfaces were highly contaminated, where washing and sanitation practices were observed to be inappropriate. Worker hygiene status was lacking essential food safety and hygiene standards. In general, the Enteric bacteria were found with higher ratio, that could affect the food quality and quantity both to a greater extent with some influences on consumers health.
Źródło:
World Scientific News; 2016, 49, 2; 192-203
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radionuclide contamination of the natural environment of Absheron Peninsula (Azerbaijan)
Promieniotwórcze skażenia śodowiska naturalnego półwyspu Absheron (Azerbejdżan)
Autorzy:
Aliyeva, S.
Powiązania:
https://bibliotekanauki.pl/articles/340296.pdf
Data publikacji:
2004
Wydawca:
Główny Instytut Górnictwa
Tematy:
ochrona radiologiczna
półwysep Absheron
skażenie gleby
radiological protection
Absheron Penisula
soil contamination
Źródło:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa; 2004, 1; 28-29
1643-7608
Pojawia się w:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy metal and mould contamination of herbal medicinal products – an overview
Autorzy:
Ałtyn, Iwona
Twarużek, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2176838.pdf
Data publikacji:
2018-12-31
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
contamination
heavy metals
medicinal plants
mould
Opis:
Rośliny zielarskie są powszechnie wykorzystywane jako surowce w przemyśle farmaceutycznym. Od czasów starożytnych ziół używa się w leczeniu i zapobieganiu chorób. Jednakże w dzisiejszych czasach mogą one nie spełniać wymagań dotyczących jakości, bezpieczeństwa i skuteczności. Większość produktów ziołowych nie jest testowana, a ich efekty działania są słabo monitorowane. Konsekwencją tego jest niewystarczająca wiedza na temat przebiegu ich działania, skutków ubocznych, przeciwwskazań oraz interakcji z występującymi na rynku produktami farmaceutycznymi oraz żywnością. Przyczyną negatywnego wpływu surowców ziołowych na organizm może być ich zanieczyszczenie przez różne grzyby pleśniowe, powstające podczas zbioru, przetwarzania, przechowywania, a także dystrybucji. Zanieczyszczenie surowców zielarskich może być również spowodowane przez różnorodne metale ciężkie, które występują w wielu aspektach współczesnego życia. Celem niniejszej pracy jest przegląd informacji na temat stanu mykologicznego i chemicznego roślin leczniczych, a także wskazanie kilku ważnych wyzwań związanych z efektywnym monitorowaniem ich bezpieczeństwa.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis Studia Naturae; 2018, 3; 125-134
2543-8832
2545-0999
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis Studia Naturae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of Trace Elements in Surface Water and Sediments from Warri River in Warri, Delta State of Nigeria
Autorzy:
Ama, Ibiam Ntachiobi
Nwajei, Godfry E.
Agbaire, P. O.
Powiązania:
https://bibliotekanauki.pl/articles/1114111.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Contamination
Trace elements
Warri River
pollution index
Opis:
The pollution of surface water and sediments by heavy metals has become a difficult thing to deal with due to their toxicity and accumulative behavior. The present study was undertaken to provide information on the concentrations and distribution of selected heavy metals in surface water and sediments from Warri River, and to compute a contamination/pollution index of heavy metals. Surface water and sediment samples were collected using standard methods and then analysed for nine trace metals. These metals were determined using a Flame Atomic Absorption Spectrophotometer – UNICAM 929. According to our results, the mean concentrations of the select metals in the sediments were higher than those of the surface water. The figures, however, varied significantly in the six sample locations (SW1–SW6). In the sediments, the highest mean concentration was of Fe (504.13 mg/kg) in location SW1, whereas in surface water, generally, the highest mean concentration was of Fe (1.23 mg/l). In other words, mean metal levels in the sediments exceeded those of surface water. This indicates that sediments are a sink for metal pollution loads. Computation of contamination/ pollution index in sediment matrix revealed that Cd moderately polluted the sediment, Zn, Fe, Ni slightly, yet significantly contaminated the sediment, while Cu, Cr and Mn very slightly contaminated the sediments. The mean values of metals in this present study were compared with other values reported by other researchers. The higher than normal metal values were attributed to anthropogenic wastes, runoff, refinery jetty and varied petroleum related activities in the area.
Źródło:
World News of Natural Sciences; 2017, 11; 65-82
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water-Borne Diseases and Their Challenges in the Coastal of Ampara District in Sri Lanka
Autorzy:
Ameer, M. L. Fowsul
Powiązania:
https://bibliotekanauki.pl/articles/1118154.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
coastal area
consumption
contamination
pathogens
water-borne diseases
Opis:
Water satisfies human needs in many ways. Without water, life is not possible in this planet. According to the estimation of the WHO, 4,000 children die every day from water-borne diseases and this condition is worst in developing and under-developed countries. Water-borne diseases are caused by the consumption of contaminated water. Indeed, it is the main agent of transference of the pathogens causing these diseases. The main objective of this paper is ‘to identify the water-borne diseases and their challenges and to suggest remedial measures to overcome the challenges in the study area’. Both primary and secondary data were used to conduct this study and the analysis of this study is tabulated clearly in the data analysis part. The coastal areas of Ampara District (Sainthamaruthu, Karaitivu, Maligaikadu Mawadipalli, Akkaraipattu, Irakkamam, Varipathanchenai, Addalaichenai, Palamunai, Oluvil and Nintavur) face a lot of challenges induced by water-borne diseases. Viruses, bacteria, parasites and protozoa are the main pathogens. Bacillary dysentery (shigellosis), cholera, other diarrheal diseases, hepatitis A and E and typhoid fever were identified as the most common diseases in these areas. The causes for the diseases are the contamination of water by improper drainage management, effluent contamination of water sources, over population and the lack of awareness among residents about water-borne diseases. According to the result of this study, controlling water contamination, constructing water purification systems, mending existing drainage systems, following instructions when constructing latrines, examining and remediating contaminated wells and providing awareness among residents are ways to attain the objectives.
Źródło:
World News of Natural Sciences; 2017, 9; 7-18
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation-induced cancer risk and decision-making in a simulated Cs-137 urban event
Autorzy:
Andrade, Edson R.
Gomes, Renato G.
Stenders, Ricardo
Brum, Tercio
Lima, Sergio X.
Castro, Mariana S. C.
Silva, Ademir X.
Powiązania:
https://bibliotekanauki.pl/articles/146858.pdf
Data publikacji:
2020
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
environmental contamination
dispersive device
decision-making
Opis:
The triggering of a “dirty bomb” generates a complex scenario, with enormous challenges for the responders due to initial misinformation and the urgency to act quickly yet effectively. Normally, the first 100 h are decisive for perceiving the risk in a more realistic dimension, but the support of methodologies that rely on computational simulations can be valuable when making key decisions. This work seeks to provide support for the early decision-making process by using a Gaussian model for the distribution of a quantity of Cs-137 spread by a radiological dispersive device (RDD). By sequentially joining two independent programs, HotSpot Health Physics codes and RESidual RADiation (RESRAD)-RDD family of codes, we came up with results that suggest a segmented approach to the potentially affected population. These results advocate that (a) the atmospheric stability conditions represented by the Pasquill–Gifford classes and (b) the population subgroups defi ned by radiation exposure conditions strongly influence the postdetonation radiological effects. These variables should be taken into account in the elaboration of flexible strategies that include many climatic conditions and to prioritize attention to different groups of public at risk. During the initial phases of such an event, it is believed that simulations using Gaussian models may be of value in anticipating the possible changes in key variables during the decision-making process. These variables may severely affect the effectiveness of the actions of responders and the general public’s safety.
Źródło:
Nukleonika; 2020, 65, 1; 37-43
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie zeolitu i bentonitu do stabilizacji ołowiu w glebie zanieczyszczonej
Application of zeolite and bentonite for stabilizing lead in a contaminated soil
Autorzy:
Andrzejewska, A.
Diatta, J.
Spiżewski, T.
Krzesiński, W.
Smurzyńska, A.
Powiązania:
https://bibliotekanauki.pl/articles/401157.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
skażenie
stabilizacja
ołów
zeolit
bentonit
contamination
stabilization
lead
zeolite
bentonite
Opis:
Ołów jest pierwiastkiem toksycznym, który często włącza się w łańcuch troficzny. Jest słabo podatny na migrację w głąb profilu glebowego, a jego obecność w wierzchnich warstwach gleb spowodowana jest czynnikami antropogenicznymi. Zeolity to krystaliczne, uwodnione glinokrzemiany zawierające w swojej budowie system komór oraz kanałów powiązanych ze sobą. To samo dotyczy bentonitów, które zawierają nie mniej niż 75% montmorillonitu. Obydwa minerały / sorbenty odznaczają się dużą pojemnością sorpcyjną, z przewagą dla bentonitów. Wprowadzenie do gleby tych sorbentów umożliwia skuteczne unieruchomienie zanieczyszczeń, szczególnie metali ciężkich. Badania miały na celu ocenę właściwości stabilizacyjnych zeolitu oraz bentonitu na glebach zanieczyszczonych ołowiem. Sorbenty te zastosowano w różnych dawkach (0; 0,25; 0,5; 1,0; 2,0; 3,0%) do gleby zanieczyszczonej ołowiem, a następnie inkubowano całość przez cztery miesiące. Zmierzono odczyn (pH) gleby, przewodność elektrolityczną oraz całkowitą zawartość stałych substancji rozpuszczonych. Oznaczono formy całkowite, a także formy reaktywne (w 0,11 mola CH3COOH dm-3) ołowiu. Ocenę efektywności stabilizacyjnej Pb dokonano na podstawie zawartości frakcji reaktywnej ołowiu w poszczególnych obiektach z zeolitem jak i bentonitem. Stwierdzono, że dodatek zarówno zeolitu jak i bentonitu wpłynął na zmniejszenie stężeń aktywnych form ołowiu w glebach skażonych tym pierwiastkiem. Zatem oba sorbenty posiadają dobre właściwości stabilizacyjne i mogą być wykorzystywane do skutecznego unieruchamiania ołowiu w glebie zanieczyszczonej antropogenicznie.
Lead is a toxic element, which is often incorporated into the trophic chain. It is resistant to migration into the soil profile and its presence in the upper layers of the soil is caused by anthropogenic factors. Zeolites are crystalline hydrated aluminosilicates containing a system of connected chambers and channels in their structure. The same properties apply to the bentonite which contains at least 75% montmorillonite. Both clay mineral / sorbents are characterised by high sorptive properties, which are greater in the case of the bentonite. Incorporation of these sorbents into the soil can effectively immobilize contaminants, especially heavy metals. The study evaluated the properties of zeolite and bentonite for stabilizing lead (Pb) in a contaminated soil. Sorbents were applied at different rates – 0, 0.25, 0.5, 1.0, 2.0, and 3.0% – to the contaminated soil and incubated for four months. Soil reaction (pH) and the electrical conductivity (EC) were measured. The total content of Pb and the reactive forms (extracted by 0.11 mol CH3COOH dm-3) were determined in the examined soil samples. Evaluation of the stabilization efficiency of Pb was performed on the basis of the fractions of the reactive lead. It was found that the addition of both zeolite and bentonite decreased the concentrations of the active forms of lead in soils. Thus, the two sorbents are characterized by a good stability and can be used for efficiently immobilizing lead in the soil contaminated through anthropogenic activity.
Źródło:
Inżynieria Ekologiczna; 2017, 18, 4; 1-6
2081-139X
2392-0629
Pojawia się w:
Inżynieria Ekologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remediation of aged hydrocarbon contaminated soil by washing in fluidized bed column
Autorzy:
Aouf, Mohhamed
Dounit, Salah
Powiązania:
https://bibliotekanauki.pl/articles/2173770.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Soil washing
Surfactant
Contamination
Hydrocarbons
Fluidization
Opis:
Soil contamination with hydrocarbons represents a worldwide problem, especially for oil-rich countries. soil contamination becomes inevitable due to different accidents, aboveground spills, and leakage, threatening the fauna and flora. The purpose of this study is to remediate One-year aged contaminated soil with crude oil (23490 mg/kg) using the fluidization technique in a laboratory-scale column. Free water and surfactant solutions were used for washing at different operating conditions. The efficiency of the method was evaluated by the calculation of the total petroleum hydrocarbons (TPH) removal ratio. Without the addition of surfactant, the cleaning operation was not sufficiently efficient, especially at room temperature where the removal ratio was only about 18%. Raising the liquid temperature leads to some improvement where the TPH removal ratio reached 49% at 50°C. With the use of solutions containing Sodium Laureth Sulfate (SLES) as a surfactant, an important enhancement of removal ratio was noted, along with an important reduction in operating time, washing solution volume, and energy consumption. The use of alternatively working/stopping operation mode contributes to the improvement of efficiency. TPH removal ratios up to 99% were obtained under some favorable conditions. This research shows encouraging results for expanding towards the industrial level with clean and sustainable resources.
Źródło:
Archives of Environmental Protection; 2022, 28, 2; 15--23
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the participation of various components in natural gas transport
Autorzy:
Apostol, R.
Kowalski, R.
Liszka, K.
Łaciak, M.
Olijnyk, A.
Szurlej, A.
Powiązania:
https://bibliotekanauki.pl/articles/299297.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
natural gas
transmission pipelines
natural gas composition
contamination of natural gas
Opis:
Natural gas is a mixture of hydrocarbons with combustible methane as the main component, the content of which usually exceeds 90%. Among the remaining components of natural gas are ethane, propane, butane, nitrogen, carbon dioxide and sulfur compounds. Helium can be also found in some natural gas fields. The composition of natural gas depends on, e.g. the field from which the gas comes, and also way in which it is transported, i.e. pipelines, LNG technology. The quality of natural gas is regulated by respective standards. Gas transmission pipelines are the most popular and dominant method of gas transport on the international gas market, though LNG technology has recently started to play an increasingly prominent role. The intensive development of renewable energy sources is accompanied by the development of the Power to gas technology – the electric energy excess is used for the hydrogen production, which can be directed to the existing natural gas network and such a mixture of natural gas and nitrogen is transmitted. At present, transmission pipelines for nitride natural gas Ls and Lw exist in Poland. The aim of this paper is to analyze the influence of natural gas admixtures on the operational parameters of transmission pipelines.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 4; 883-894
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł

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