Abstract
Massive amount of food waste has been generated annually, posing a threat to ecological sustainability and the social economy due to current disposal methods. Urgent action is needed worldwide to convert the traditional pathway for treating food waste into a sustainable bioeconomy, as this will significantly benefit food chain management. This study explores the use of pyrolysis to produce different types of food waste biochars and investigates their adsorption capabilities for removing Cd2+ and Pb2+ in aqueous solution. The results indicated that co-pyrolysis biochar from fresh food waste and rice husk (FWRB) exhibited superior adsorption performance for Cd2+ (61.84 mg·g−1) and Pb2+ (245.52 mg·g−1), respectively. Pseudo-second-order kinetics (0.74 ≤ R2 ≤ 0.98) and Langmuir isotherms (0.87 ≤ R2 ≤ 0.98) indicated that the immobilized Cd2+ and Pb2+ on biochars were mainly attributed to the chemisorption, including precipitation with minerals (e.g., carbonates, silicates, and phosphate), complexation with functional groups (–OH), cation exchange (–COO−), and coordination with π-electrons. Furthermore, FWRB demonstrated reduced EC and Na content in comparison to food waste digestate biochar (FWDB) and food waste digestate co-pyrolysis with sawdust biochar (FWSB), with levels of Cd and Pb falling below China’s current guideline thresholds. These findings suggested that co-pyrolysis of fresh food waste with rice husk could be applicable to the recycling of food waste into biochar products for heavy metal stabilization in contaminated water and soils.
Graphical Abstract
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Data availability
All data used to support the findings of this study are included within the article.
Abbreviations
- MSW:
-
Municipal solid waste
- UNEP:
-
United Nations Environment Program
- GHGs:
-
Greenhouse gases
- EU:
-
European Union
- HMs:
-
Heavy metals
- FW:
-
Food waste
- FWDB:
-
Food waste digestate biochar
- FWSB:
-
Co-pyrolysis of food waste digestate and sawdust biochar
- FWRB:
-
Co-pyrolysis of fresh food waste and rice husk biochar
- HEWAO:
-
High-efficiency wet air oxidation
- HWFB:
-
HEWAO-treated food waste residue biochar
- EC:
-
Electrical conductivity
- CEC:
-
Cation exchange capacity
- TOC:
-
Total organic carbon content
- DOC:
-
Dissolvable organic carbon
- DON:
-
Dissolvable organic nitrogen
- ICP-OES:
-
Inductively coupled plasma-optical emission spectrometry
- ICP-MS:
-
Inductively coupled plasma-mass spectrometry
- BET:
-
Brunauer-Emmett-Teller
- SEM-EDS:
-
Scanning electron microscope-energy-dispersive spectroscopy
- FT-IR:
-
Fourier-transform infrared spectroscopy
- XRD:
-
X-ray diffractometry
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Funding
This work was founded by “the Fundamental Research Funds for the Central Universities” under grant no. KYGD2023001, and supported by the Science and Technology Innovation Program of Jiangsu province, China for “Carbon Dioxide Emission Peaking and Carbon Neutrality” under grant nos. BE2022423 and BE2022307 and Guangdong Provincial Housing and Urban–Rural Development 2023-K33-415203.
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Shuai Tian: conceptualization, investigation, software, writing—original draft, and formal analysis. Xueliu Gong: investigation and methodology. Qiuyu Yu: investigation and methodology. Fei Yao: investigation. Wenjian Li: investigation. Zilin Guo: investigation. **n Zhang: investigation. Yuan Yuan: investigation. Yuqing Fan: investigation. Rongjun Bian: conceptualization, resources, supervision, writing—review and editing, funding acquisition, and Validation. Yan Wang: investigation. Xuhui Zhang: investigation. Lianqing Li: supervision and methodology. Genxing Pan: supervision and methodology.
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Tian, S., Gong, X., Yu, Q. et al. Efficient removal of Cd(II) and Pb(II) from aqueous solution using biochars derived from food waste. Environ Sci Pollut Res 30, 122364–122380 (2023). https://doi.org/10.1007/s11356-023-30777-1
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DOI: https://doi.org/10.1007/s11356-023-30777-1