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Title: IMMOBILIZATION OF HEAVY METALS IN PORTLAND CEMENT-MUNICIPAL SOLID WASTE INCINERATION ASH MATRIX
IMMOBILIZATION OF HEAVY METALS IN PORTLAND CEMENT-MUNICIPAL SOLID WASTE INCINERATION ASH MATRIX

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Martina Zaleska; Milena Pavlikova; Adam Pivak; Zbysek Pavlik; Jana Nabelkova
10.5593/sgem2023/6.1/s26.38
10.5593/sgem2023/6.1
1314-2704
978-619-7603-61-3
English
23
6.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Green Buildings Technologies and Materials
A novel composite matrix composed of Portland cement (PC) and municipal solid waste incineration ash (MSWIA) was developed for the simultaneous immobilization of three heavy metals - Ba, Pb and Zn. The main motivation for the research was to exploit and reuse MSWIA to design alternative composite matrix with the ability to immobilize hazardous pollutants, such as heavy metals, which might be used as filler for the cement-based construction materials. In composition of prepared composite matrix, MSWIA was used as addition to PC in the amount of 10 wt%. Silica sand of 0-2 mm fraction was used as aggregate. Water/binder ratio was 0.61. It was adjusted to obtain workable fresh mixture. Soluble heavy metal salts (BaCl2, Pb(NO3)2, ZnCl2) were added to batch water at a rate of 2.5% of the individual heavy metal by weight of the PC. The assessment of developed matrices included basic structural and mechanical properties. To evaluate the immobilization of the studied heavy metals in the prepared composites, the leaching test was performed with a ratio of liquid to solid of 10 l/kg. Atomic absorption spectroscopy (AAS) was used to analyze the concentration of Ba, Pb and Zn in leachates. The presence of heavy metal salts negatively affected the strength of both composite matrices. Nevertheless, the addition of MSWIA improved both flexural and compressive strength in comparison to reference composite matrix. The increase in the flexural strength was 21.4% and 32.4% in the compressive strength. The concentrations of all examined heavy metals studied in the leachates from the developed composite matrices were very low, indicating that they were completely solidified and immobilized in the matrix. Moreover, the application of MSWIA reduced the leaching of Pb and Zn.
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[9] EN 12350-5 Testing fresh concrete - Part 5: Flow Table Test, CEN 2019.
[10] EN 196-1 Methods of testing cement - Part 1: Determination of strength, CEN 2010.
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Authors greatly acknowledge the financial support received from the Czech Science Foundation under project No. 23-04744S - Research of heavy metals immobilization in alternative low-carbon composites. This research has been also partially supported by the Grant Agency of the Czech Technical University in Prague, grant No. SGS23/OHK1/3T-002/23 - Research and development of high performance building composites.
conference
https://doi.org/10.5593/sgem2023/6.1/s26.38
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Proceedings of 23rd International Multidisciplinary Scientific GeoConference SGEM 2023
23rd International Multidisciplinary Scientific GeoConference SGEM 2023, 03 - 09 July, 2023
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Turkish Acad Sci.
305-312
03 - 09 July, 2023
website
9250
heavy metals, immobilization, cement-based composite matrix, municipal solid waste incineration ash, leaching, atomic absorption spectroscopy