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Wyszukujesz frazę "waste sediments" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Utilization and End-Users Acceptability of Compressed Lahar Sediment Blocks as Wall Panel for Low-Cost Housing
Autorzy:
Ganiron Jr, Tomas U.
Ganiron, Tomas Malvecino
Powiązania:
https://bibliotekanauki.pl/articles/1178358.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Concrete blocks
environment-friendly
lahar sediments
low-cost housing
waste materials
Opis:
This research aimed to use lahar sediments from the volcanic eruption in which people would be able to benefit from the construction technology in the form of sediment block was similar to the conventional concrete hollow block. The study focuses on the recognition and acceptance of indigenous material, specifically lahar, as an alternative solution in the reproduction of low-cost housing to lower construction cost and housing backlogs. The study attempts to discover the utilization and end-users acceptability of Compressed Lahar Sediment Blocks (CLSB). This research presented an analysis and determination of the use of compressed lahar sediment blocks as local building material for low-cost housing and its acceptability as an alternative to concrete base materials. It also contemplates a new idea in the development and production of low-cost housing and in support to the government National Shelter Program
Źródło:
World Scientific News; 2017, 77, 2; 177-194
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy metal concentration and distribution in stream sediments of Ndongo River, Buea, Cameroon - environmental impact
Autorzy:
Tchounda, Teclaire
Mboudou, Germain Marie Monespérance
Agyingi, Christopher Mbaringong
Powiązania:
https://bibliotekanauki.pl/articles/1066167.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Buea
Heavy metal contamination
Igeo
Ndongo River
PLI
anthropogenic metal input
domestic waste
geochemical entity
pollution load index
stream sediments
Opis:
Thirty two active stream sediment samples were collected, panned and sieved from a 16km (500m spacing) section along Ndongo River, Buea. Sixteen of them were subjected to magnetic separation for the determination of heavy minerals under a microscope (KARL ZEISS IENA) and analyzed by XRF and AAS for As, Be, Cd, Co, Cu, Cr, Mo, Ni, Pb, Rb, Sb, Sc, Sn, Sr V, Zn, and Zr. The average element concentrations are 0.014, 64.45, 76.93, 94.52, 87.65, 147.79, 0.00, 77.00, 98.99, 40.37, 7.99, 24.70, 52.42, 1053.37, 285.46, 579.70 and 404.41ppm respectively. As (0.014 ppm) and Mo (0.001 ppm) are below l average concentrations in basalts while dispersed Be, Cd, Co, Cu, Cr, Ni, Pb, Sb, Sc, Sn, V, Zn values are mostly above tolerance limit in settlement areas and farmlands. Olivine with angular grains (1.5mm) and sub-hedral shape representing 10 vol. % is light green colored. Together with pyroxene (elongated, black colored with angular grains up to 0.7mm) are the most abundant minerals. Minor rutile with shiny luster is also present. R-mode factor analysis reveals Ni-Rb-V, Co–Cr–Pb–Zn, and Cu–Sr-Zr associations representing three geochemical entities related to agricultural (fertilizers) and settlement (domestic waste) areas. Correlation coefficients (r) vary from -0.84 (V, Sb) to 0.728 (Ni, Rb) and may indicate different sources of metal contamination. The calculated PLI (3.10 to 4.92) and Igeo (-7.37 to 9.18) of As, Be, Cd, Co, Cu, Cr, Mo, Ni, Pb, Rb, Sb, indicate metal pollution of River Ndongo sediments. The obtained classification is defined as low (As, Co, Cu, Cr, Mo, Ni, Sc, and V), partially (Co, Zn), moderately (Pb, Be) and highly to very highly (Sb, Sr, Cd) polluted. Natural and anthropogenic metal input assessment reveals that the dominantly basaltic lithologies in the area (pyroxene and olivine), the domestic and agricultural activities as well as urbanization processes of Buea are the main source of metal contamination.
Źródło:
World Scientific News; 2019, 131; 15-36
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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