The immobilisation of heavy metals from sewage sludge ash in CO2-cured mortars
Authors:
- Erick Grünhäuser Soares,
- João Castro-Gomes,
- Mateusz Sitarz,
- Tomasz Zdeb,
- Izabela Hager
Abstract
Sewage treatment processes are a serious environmental threat due to the difficulties involved in its waste management and disposal. Therefore, one developing trend in sewage sludge processing is its thermal treatment, which generates sewage sludge ash that may contain many environmental pollutants, such as heavy metals. Moreover, due to the European Union requirements that not only focus on the waste generation reduction but also on its reuse and final disposal, it is essential to pursue new applications of such resources, such as the waste-based material incorporation into alternative cementitious materials. Thus, this study evaluated the heavy metals leachability of CO2-cured mortars incorporating sewage sludge ash as filler. For this purpose, Portland cement, reactive magnesia, and electric arc furnace slag were used to produce three different CO2-cured mortars, which were cured though pressurised accelerated carbonation curing for 24 h. These mortars presented up to 12.7 MPa as compressive strength and their carbonation was confirmed by TG-DTG and FT-IR analyses. Their leachability of heavy metals met the European requirements for all waste materials, including inert materials, and post-industrial wastewater. Therefore, the immobilisation of heavy metals in this binding technology may be considered an effective method to safely manage sewage sludge ash.
- Record ID
- CUTa591df5d16ab40ecb796b874e6a3fed9
- Publication categories
- ;
- Author
- Journal series
- Sustainability, ISSN , e-ISSN 2071-1050, Biweekly
- Issue year
- 2021
- Vol
- 13
- No
- 22
- Pages
- [1-13]
- Article number
- 12893
- Other elements of collation
- fot.; tab.; wykr.; Bibliografia (na s.) - 11-13; Bibliografia (liczba pozycji) - 45; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 13, Iss. 22, Spec. Iss.
- Substantive notes
- Special Issue: Environmental Management in Materials Science and Engineering for Sustainability
- Keywords in English
- CO2-cured mortar, CO2 adsorption, heavy metal immobilisation, leaching, sewage sludge ash, electric arc furnace slag, carbonated reactive magnesia cement, Portland cement
- DOI
- DOI:10.3390/su132212893 Opening in a new tab
- URL
- https://www.mdpi.com/2071-1050/13/22/12893 Opening in a new tab
- Related project
- E-mobilność oraz zrównoważone materiały i technologie. . Project leader at PK: , ,
- Language
- eng (en) English
- License
- Score (nominal)
- 100
- Publication indicators
- = 8
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTa591df5d16ab40ecb796b874e6a3fed9/
- URN
urn:pkr-prod:CUTa591df5d16ab40ecb796b874e6a3fed9
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.