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- Publisher Website: 10.1016/j.jenvman.2022.116635
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Article: Immobilization of heavy metals in biochar by co-pyrolysis of sludge and CaSiO3
| Title | Immobilization of heavy metals in biochar by co-pyrolysis of sludge and CaSiO3 |
|---|---|
| Authors | |
| Keywords | Calcium silicate Heavy metal fraction Heavy metal stabilization Sludge-based biochar |
| Issue Date | 1-Jan-2023 |
| Publisher | Elsevier |
| Citation | Journal of Environmental Management, 2023, v. 326 How to Cite? |
| Abstract | Sludge pyrolysis has become an important method of sludge recycling. Stabilizing heavy metals in sludge is key to sludge recycling. Currently, research on the co-pyrolysis of sludge and industrial waste is limited. This study aims to explore the impact and mechanism of the co-pyrolysis of sludge and CaSiO3 (the main component of slag) and to achieve the concept of “treating waste with waste”. To this end, we added different proportions of CaSiO3 (0%, 3%, 6%, 9%, 12%, and 15%) for the co-pyrolysis with sludge, and varied the pyrolysis temperatures (300, 400, 500, 600, and 700 °C) and retention times (15, 30, 60, and 120 min) to study heavy-metal stabilization in sludge. Consequently, the optimum dosage of CaSiO3 required for the immobilization of different heavy metals was 9% (Cu, Zn, Pb, and Cr) and 15% (Ni). The contents of Cu, Zn, Pb, Cr, and Ni in the stable state (oxidized and residual states) were 92.73%, 79.23%, 99.55%, 92.43% and 90.33% respectively. At a pyrolysis temperature of 700 °C, the steady-state proportions of Cr, Pb, and Zn were 88.12%, 90.21%, and 77.21%, respectively. At a pyrolysis temperature of 400 °C, the stable-Cu and -Ni contents were 97.21% and 99.43%, respectively. The optimal dwelling time was 15 min. The results showed that the CaSiO3 addition weakened the O–H stretching vibration peak intensity, promoted the formation of aromatic and epoxy ring structures, and enhanced the heavy-metal immobilization. Furthermore, the CaSiO3 decomposition during co-pyrolysis produced SiO2, CaO, and Ca(OH)2, which helped stabilize heavy metals. |
| Persistent Identifier | http://hdl.handle.net/10722/338025 |
| ISSN | 2021 Impact Factor: 8.910 2020 SCImago Journal Rankings: 1.441 |
| ISI Accession Number ID |
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Zhang, Shijie | - |
| dc.contributor.author | Gu, Weihua | - |
| dc.contributor.author | Geng, Zhixin | - |
| dc.contributor.author | Bai, Jianfeng | - |
| dc.contributor.author | Dong, Bin | - |
| dc.contributor.author | Zhao, Jing | - |
| dc.contributor.author | Zhuang, Xuning | - |
| dc.contributor.author | Shih, Kaimin | - |
| dc.date.accessioned | 2024-03-11T10:25:42Z | - |
| dc.date.available | 2024-03-11T10:25:42Z | - |
| dc.date.issued | 2023-01-01 | - |
| dc.identifier.citation | Journal of Environmental Management, 2023, v. 326 | - |
| dc.identifier.issn | 0301-4797 | - |
| dc.identifier.uri | http://hdl.handle.net/10722/338025 | - |
| dc.description.abstract | <p><a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/sludge" title="Learn more about Sludge from ScienceDirect's AI-generated Topic Pages">Sludge</a> <a href="https://www.sciencedirect.com/topics/engineering/pyrolysis" title="Learn more about pyrolysis from ScienceDirect's AI-generated Topic Pages">pyrolysis</a> has become an important method of sludge recycling. Stabilizing <a href="https://www.sciencedirect.com/topics/engineering/heavy-metal" title="Learn more about heavy metals from ScienceDirect's AI-generated Topic Pages">heavy metals</a> in sludge is key to sludge recycling. Currently, research on the co-pyrolysis of sludge and industrial waste is limited. This study aims to explore the impact and mechanism of the co-pyrolysis of sludge and CaSiO<sub>3</sub> (the main component of slag) and to achieve the concept of “treating waste with waste”. To this end, we added different proportions of CaSiO<sub>3</sub> (0%, 3%, 6%, 9%, 12%, and 15%) for the co-pyrolysis with sludge, and varied the <a href="https://www.sciencedirect.com/topics/engineering/pyrolysis" title="Learn more about pyrolysis from ScienceDirect's AI-generated Topic Pages">pyrolysis</a> temperatures (300, 400, 500, 600, and 700 °C) and retention times (15, 30, 60, and 120 min) to study heavy-metal stabilization in sludge. Consequently, the optimum dosage of CaSiO<sub>3</sub> required for the <a href="https://www.sciencedirect.com/topics/engineering/immobilisation" title="Learn more about immobilization from ScienceDirect's AI-generated Topic Pages">immobilization</a> of different <a href="https://www.sciencedirect.com/topics/engineering/heavy-metal" title="Learn more about heavy metals from ScienceDirect's AI-generated Topic Pages">heavy metals</a> was 9% (Cu, Zn, Pb, and Cr) and 15% (Ni). The contents of Cu, Zn, Pb, Cr, and Ni in the stable state (oxidized and residual states) were 92.73%, 79.23%, 99.55%, 92.43% and 90.33% respectively. At a pyrolysis temperature of 700 °C, the steady-state proportions of Cr, Pb, and Zn were 88.12%, 90.21%, and 77.21%, respectively. At a pyrolysis temperature of 400 °C, the stable-Cu and -Ni contents were 97.21% and 99.43%, respectively. The optimal dwelling time was 15 min. The results showed that the CaSiO<sub>3</sub> addition weakened the O–H stretching vibration peak intensity, promoted the formation of aromatic and epoxy ring structures, and enhanced the heavy-metal <a href="https://www.sciencedirect.com/topics/engineering/immobilisation" title="Learn more about immobilization from ScienceDirect's AI-generated Topic Pages">immobilization</a>. Furthermore, the CaSiO<sub>3</sub> decomposition during co-pyrolysis produced SiO<sub>2</sub>, CaO, and Ca(OH)<sub>2</sub>, which helped stabilize heavy metals.<br></p> | - |
| dc.language | eng | - |
| dc.publisher | Elsevier | - |
| dc.relation.ispartof | Journal of Environmental Management | - |
| dc.subject | Calcium silicate | - |
| dc.subject | Heavy metal fraction | - |
| dc.subject | Heavy metal stabilization | - |
| dc.subject | Sludge-based biochar | - |
| dc.title | Immobilization of heavy metals in biochar by co-pyrolysis of sludge and CaSiO3 | - |
| dc.type | Article | - |
| dc.identifier.doi | 10.1016/j.jenvman.2022.116635 | - |
| dc.identifier.scopus | eid_2-s2.0-85143551861 | - |
| dc.identifier.volume | 326 | - |
| dc.identifier.eissn | 1095-8630 | - |
| dc.identifier.isi | WOS:000889850600007 | - |
| dc.identifier.issnl | 0301-4797 | - |