Influence of pyrolysis temperature on characteristics and heavy metal adsorptive performance of biochar derived from municipal sewage sludge
Abstract
To investigate systematically the influence of pyrolysis temperature on properties and heavy metal adsorption potential of municipal sludge biochar, biophysical dried sludge was pyrolyzed under temperature varying from 500°C to 900°C. The biochar yield decreased with the increase in pyrolysis temperature, while the ash content retained mostly, thus transforming the biochars into alkaline. The structure became porous as the temperature increased, and the concentrations of surface functional group elements remained low. Despite the comparatively high content of heavy metal in the biochar, the leaching toxicity of biochars was no more than 20% of the Chinese standard. In the batch experiments of cadmium(II) adsorption, the removal capacity of biochars improved under higher temperature, especially at 800°C and 900°C even one order of magnitude higher than that of the commercial activated carbon. For both energy recovery and heavy metal removal, the optimal pyrolysis temperature is 900°C.
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The increase in ash content resulted from progressive concentration of inorganic constituents and OM combustion residues.
“The increase in the ash content resulted from progressive concentration of inorganic constituents and OM combustion residues”
From Biochar physicochemical properties: pyrolysis temperature and feedstock kind effects (2020) · cites this paper as Chen et al. 2014
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- Authors
- Chen, T., Zhang, Y., Wang, H., Lu, W., Zhou, Z., Zhang, Y., & Ren, L.
- Affiliations
- Tsinghua University (CN)
- Hunan University (CN)
- Corresponding author
- Wang, Hongtao
- Venue
- Bioresource Technology
- Publisher
- Elsevier BV
- Published
- 2014-07
- Volume
- 164
- Pages
- 47-54
- ISSN
- 0960-8524 (ISSN-L)
- OpenAlex
- W2015240204
- Cited by
- 797
- References
- 33
- Citations by year
- 2026: 55 · 2025: 49 · 2024: 98 · 2023: 72 · 2022: 99 · 2021: 100 · 2020: 84 · 2019: 83 · 2018: 55 · 2017: 52 · 2016: 31 · 2015: 18 · 2014: 1
- FWCI
- 25.87
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Bioresource Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Natural Science Foundation of China (41371472)
- Major Science and Technology Program for Water Pollution Control and Treatment of the Ministry of Environmental Protection of China (2011ZX07317-001)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Physical Sciences › Engineering › Building and Construction › Recycling and utilization of industrial and municipal waste in materials production
- Keywords
- biochar, sewage sludge, pyrolysis temperature, heavy metal adsorption, cadmium removal, leaching toxicity, biochar porosity, surface functional groups, ash content, activated carbon comparison, energy recovery
- MeSH terms
- Adsorption, Cadmium, Charcoal, China, Cities, Hydrogen-Ion Concentration, Nitrogen, Sewage, Solutions, Surface Properties, Temperature, Porosity, Spectroscopy, Fourier Transform Infrared, Metals, Heavy
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