Temat: Cement Pollution - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Mechanism of Amphoteric Metals Cations Immobilization into Clay-Cement Mixtures
Mechanizm immobilizacji kationów metali amfoterycznych w mieszaninach iłowo-cementowych
Autorzy:: Stempkowska, Agata
Powiązania:: https://bibliotekanauki.pl/articles/971124.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Tematy:: jony amfoteryczne
zanieczyszczenie metalami
mieszanki gliny z cementem
hydratacja
amphoteric ions
metals pollution
clay-cement mixtures
hydratation
Opis:: The article presents the possibilities of using special prepared binders to reduce the emission of ions from soil, and immobilize metals migration from waste deposits. Clay-cement slurries are mixtures containing in their compositions clinker binder and clay minerals, in this case they were Bełchatów and Koniecpol clays. After hydratation process mixtures they create flexible and tight structures that are used, among others, as a barriers immobilizing the spread of pollution. The tests have shown that in the case of amphoteric metals, it is possible to accumulate almost 100% of the contamination using clay-cement suspensions. An attempt was also made to explain the mechanisms of ion retention in arised structures. The article presents three probable mechanism of amphoteric ions binding, the first is retention in the clay minerals interlayer spaces, the second is entrapment in CSH type phases formed during hydratation. Last possibility is formation of some new silicate structures.
W artykule przedstawiono możliwości zastosowania specjalnie przygotowanych spoiw w celu unieruchomienia migracji metali amfoterycznych. Spoiwa cementowo-iłowe to mieszanki zawierające w swoich składach spoiwo klinkierowe i minerały ilaste, w tym przypadku były to gliny Bełchatów i Koniecpol. Po procesie hydratacji mieszanki te tworzą elastyczne i szczelne struktury, które są wykorzystywane m.in. jako bariery unieruchamiające rozprzestrzenianie się zanieczyszczeń. Testy wykazały, że w przypadku metali amfoterycznych możliwa jest prawie 100% akumulacja zanieczyszczeń w strukturze zawiesin iłowo-cementowych. Podjęto również próbę wyjaśnienia mechanizmów zatrzymywania jonów w powstałych strukturach. W artykule przedstawiono trzy prawdopodobne mechanizmy wiązania jonów amfoterycznych, pierwszy to retencja w przestrzeniach międzywarstwowych minerałów ilastych, drugi to uwięzienie w fazach typu CSH powstałych podczas hydratacji. Ostatnią możliwością jest tworzenie nowych struktur krzemianowych.
Źródło:: Inżynieria Mineralna; 2020, 1, 1; 13-21
1640-4920
Pojawia się w:: Inżynieria Mineralna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Economics of Environmental Pollution on Cassava-Based Farmers’ Health and Production Efficiency within Lafarge Cement Concession Area in Mfamosing, Cross River State, Nigeria
Autorzy:: Edet, E. O.
Udoe, P. O.
Isong, I. A.
Abiam, N. E.
Powiązania:: https://bibliotekanauki.pl/articles/1077276.pdf
Data publikacji:: 2019
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Cement Pollution
Lafarge
Mfamosing
Stochastic Frontier
cassava-based farmers
Opis:: The paper undertakes an assessment of the economics of environmental pollution on cassava-based farmers’ health and production efficiency within the Lafarge cement concession area in Mfamosing, Akamkpa Local Government Area, Cross River State. Data for the study were sourced from 60 cassava-based farmers drawn from neighbourhood and non-neighbourhood locations and analyzed using descriptive statistics and stochastic production frontier techniques. The result showed that farming activities in the area have been dominated by females with an average age of 43 and 35 years of age and household size between 4 and 6 persons. Clearly, the results indicate that cement plant activities have reduced farm productivity over the last 5 years, and has affected the livelihood of the farmers. The study also averred that respiratory diseases, diarrhea, skin rashes, heart disease, asthma, coughs and skin cancer have been the various health challenges suffered by the farmers. According to the study results, farmers lost 44 days due to heart disease, 33 days due to respiratory diseases, and 7 days due to diarrhea. The result of the maximum likelihood estimates (MLEs) of the stochastic frontier production function indicate that hired labour, quantity of fertilizer used and quantity of cassava stem cuttings were the significant variables that influenced cassava yield. The estimated technical efficiency (TE) ranged from 0.45 - 0.99, with a mean index of 0.67 (target group) and 0.57 – 0.99, with a mean of 0.82 (control group). The number of days lost due to illness was the most significant variable influencing inefficiency levels in the study area. It was, therefore, recommended that policies aimed at increasing efficiency should focus on improving health care services in the farming communities, while encouraging efficient level of pollution control by the prescribed cement factory, ab initio.
Źródło:: World News of Natural Sciences; 2019, 23; 182-199
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Utilization of cement and other additives for solidification/stabilization of soil contaminated simultaneously with Cd2+ and Pb2+ ions
Autorzy:: Xi, Y.
Wang, H.
Guo, L.
Zhang, M.
Powiązania:: https://bibliotekanauki.pl/articles/208172.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: cement
soil pollution
X-ray diffraction
dyfrakcja rentgenowska
zanieczyszczenie gleby
Opis:: Various additives, including cement, quicklime, fly ash, montmorillonite, sepiolite and their proportions were employed to stabilize/solidify artificially prepared soils contaminated simultaneously with two kinds of ions such as Cd²⁺ and Pb²⁺. The unconfined compressive strength of the stabilized soils was measured to estimate the possibility of recycling. The efficiency of Cd²⁺ and Pb²⁺ immobilization in contaminated soils was also evaluated using the US EPA TCLP toxicity test. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to elucidate the mechanisms responsible for the immobilization of heavy metals. The experimental results demonstrate that in terms of soils simultaneously polluted with Cd²⁺ and Pb²⁺ ions, the curing effect of fly ash is better than that of montmorillonite and sepiolite. When Cd²⁺ and Pb²⁺ coexist in soil specimens, the curing is more difficult than for Cd2+ or Pb2+ alone, which is antagonistic mechanism. Also, the leaching concentration of Cd²⁺ and Pb²⁺ gradually decreases upon increasing pH when pH < 8. For pH ≥ 8, the leaching concentration of Cd²⁺ and Pb²⁺ reached a minimum. Besides, the results of XRD and SEM are in agreement with those of the strength and leaching tests.
Źródło:: Environment Protection Engineering; 2018, 44, 1; 61-73
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Ecological Assessment of the Current State of Environmental Components on the Territory of the Impact of Cement Production Industry
Autorzy:: Strizhenok, A. V.
Ivanov, A. V.
Powiązania:: https://bibliotekanauki.pl/articles/124168.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: cement production industry
cement dust
environment
pollution
degradation of vegetation
NDVI index
deposition of dust
Opis:: The monitoring of the environmental components condition, exposed to the influence of the cement production enterprises, was the aim of the conducted research. One of the largest cement production factories in Russia, where the territory of negative impact has a total area of over 300 square kilometers, was the object of the study. The observations of the dust content in atmospheric air, as well as the determination of degradation degree of vegetation in the area of influence of the considered production facility were conducted. Chemical and granulometric composition of the cement dust, which is emitted in atmospheric air, were identified in the laboratory. Mapping model, which indicates the complex ecological welfare of the territory, exposed to the cement production industry, was compiled by the authors on the basis of the data, obtained in conducted research. The mapping model takes into account both the content of dust in near-ground atmosphere, and the extent of its deposition to soil, vegetation and surface water bodies.
Źródło:: Journal of Ecological Engineering; 2017, 18, 6; 160-165
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: „Pyły, ludzie, przyroda”. Zanieczyszczenie powietrza atmosferycznego w województwie kieleckim w latach 1975–1989
Autorzy:: Dulewicz, Jarosław
Powiązania:: https://bibliotekanauki.pl/articles/689870.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Instytut Historii im. Tadeusza Manteuffla PAN w Warszawie
Tematy:: air pollution
cement dust
forest degradation
ecological threat
industrialization
environment
zanieczyszczenie powietrza
pyły cementowe
degradacja lasów
zagrożenie ekologiczne
industrializacja
środowisko
Opis:: The industrialization of the 1975–1989 period brought changes in spatial development and transformations in the human natural environment. New industrial investments required space for their implementation. As a result, the size of green areas near the cities gradually decreased. In addition, the activity of the “old” plants, as well as those under development, posed a serious threat to the environment. These problems were also evident in the province of Kielce. In the middle of the Gierek’s decade the region ranked fifth in the country in terms of the amount of pollution emitted into the atmosphere. In the area of “White Basin”, where many cement and lime factories were concentrated, dust fallout production standards were exceeded even several times. Results of the analyses on the problem of environmental threats may become an important part of the debate on socio-economic processes taking place in Poland during the postwar period. Hitherto studies of industrialization in the years 1944/1945–1989 focused mainly on its social consequences. However, they almost completely ignore the issue of degradation of the ecosystem, which is also closely associated with the industrialization pursued.
W artykule przeanalizowano relacje zachodzące pomiędzy procesem industrializacji a stanem środowiska naturalnego w PRL w latach 1975–1989 na przykładzie województwa kieleckiego. Prowadzona w tym okresie rozbudowa przemysłu bez uwzględnienia potencjalnych zagrożeń ekologicznych spowodowała szybką degradację poszczególnych komponentów ekosystemu. Środowiskowy fragment historii społeczno-gospodarczej Polski w okresie powojennym jest szczególnie ciekawy i warty pogłębionych studiów, tym bardziej że dotychczas był to aspekt pomijany przez badaczy dziejów najnowszych.
Źródło:: Polska 1944/45-1989. Studia i Materiały; 2016, 14
2450-8365
Pojawia się w:: Polska 1944/45-1989. Studia i Materiały
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Cementation as a method of remediation of soil contaminated with xylene
Autorzy:: Banaszkiewicz, K. P.
Marcinkowski, T. A.
Powiązania:: https://bibliotekanauki.pl/articles/207715.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: soil pollution
activated carbon
chromatographic analysis
Portland cement
contamination
monitoring
volatile organic compounds
zanieczyszczenie gleby
węgiel aktywowany
analiza chromatograficzna
cement portlandzki
odpady
dekontaminacja
lotne związki organiczne
Opis:: The research was performed to evaluate usability of stabilization/ solidification (S/S) processes in permanent separation of the surface of soil contaminated with xylene in order to reduce its emission to the environment. For the needs of the experiment, soil samples were prepared with the same amounts of solvent and then, after averaging their physicochemical composition, stabilized with Portland cement CEM II 32,5 R. In the course of stabilization/solidification process, all emitted gaseous contaminants were monitored. The effect of a binder dose on xylene emission was evaluated based on the momentary concentrations (C8H10) monitored above the surface of reactive mixture using a flame-ionization detector. Simultaneously, contaminated air was run through pipes filled with activated carbon. Then, based on chromatographic analysis of xylene vapors adsorbed on activated carbon, the measured momentary concentrations were verified.
Źródło:: Environment Protection Engineering; 2014, 40, 1; 57-66
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki