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Tytuł:
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Index Properties, Hydraulic Conductivity and Contaminant-Compatibility of CMC-Treated Sodium Activated Calcium Bentonite.
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Autorzy:
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Fan RD; School of Materials Science and Engineering, Southeast University, Nanjing 210096, China.; Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China.
Reddy KR; Department of Civil & Materials Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA.
Yang YL; Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China.
Du YJ; Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China.
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Źródło:
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International journal of environmental research and public health [Int J Environ Res Public Health] 2020 Mar 13; Vol. 17 (6). Date of Electronic Publication: 2020 Mar 13.
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Typ publikacji:
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Journal Article; Research Support, Non-U.S. Gov't
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Język:
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English
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Imprint Name(s):
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Original Publication: Basel : MDPI, c2004-
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MeSH Terms:
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Bentonite*
Metals, Heavy*
Water Pollutants, Chemical*
Calcium ; Carboxymethylcellulose Sodium ; Sodium
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References:
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Int J Environ Res Public Health. 2019 Sep 04;16(18):. (PMID: 31487890)
J Hazard Mater. 2015 Apr 9;286:144-51. (PMID: 25576782)
Sci Total Environ. 2020 May 10;716:137095. (PMID: 32059325)
Int J Environ Res Public Health. 2020 Jan 06;17(1):. (PMID: 31935850)
J Hazard Mater. 2019 May 5;369:353-361. (PMID: 30784965)
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Contributed Indexing:
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Keywords: bentonite; carboxymethyl cellulose; chemical compatibility; heavy metal; landfill leachate
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Substance Nomenclature:
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0 (Metals, Heavy)
0 (Water Pollutants, Chemical)
1302-78-9 (Bentonite)
9NEZ333N27 (Sodium)
K679OBS311 (Carboxymethylcellulose Sodium)
SY7Q814VUP (Calcium)
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Entry Date(s):
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Date Created: 20200319 Date Completed: 20200921 Latest Revision: 20200921
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Update Code:
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20240105
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PubMed Central ID:
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PMC7143218
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DOI:
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10.3390/ijerph17061863
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PMID:
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32183048
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A typical sodium activated calcium bentonite (SACaB) was treated with carboxymethyl cellulose (CMC) polymer, called CMC-treated SACaB (CMC-SACaB), and it was investigated for its hydraulic conductivity and enhanced chemical compatibility. Index property and hydraulic conductivity tests were conducted on CMC-SACaB and SACaB with deionized water (DIW), heavy metals-laden water, and actual landfill leachate. Lead-zinc mixed (Pb-Zn) solution and hexavalent chromium (Cr(VI)) solution were selected as target heavy metals-laden water, and calcium (Ca) solution was tested for comparison purposes. The hydraulic conductivity (kMFL) was determined via the modified fluid loss (MFL) test. Liquid limit and swell index in DIW, heavy metal-laden water, and Ca solution increased with increasing CMC content. CMC treatment effectively decreased the kMFL of SACaB when exposed to Pb-Zn solutions with a metal concentration of 1 to 20 mmol/L and landfill leachate. An insignificant change in kMFL of CMC-SACaB occurred with exposure to Pb-Zn solutions with metal concentrations of 1 to 10 mmol/L, Cr(VI) and Ca solutions with metal concentration of 1 to 20 mmol/L, and landfill leachate. A slight increase in kMFL of CMC-SACaB was observed when Pb-Zn concentration increased to 20 mmol/L, and such an increment was more noticeable when the CMC content was lower than 10%. In the DIW, the measured kMFL values of CMC-SACaB and SACaB with a given range of void ratio were consistent with those obtained from the flexible-wall permeameter test.