Academic Journal
Source-dependent pyrolysis temperature optimization for sewage sludge biochar: balancing nutrient retention and heavy metal passivation.
| Τίτλος: | Source-dependent pyrolysis temperature optimization for sewage sludge biochar: balancing nutrient retention and heavy metal passivation. |
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| Συγγραφείς: | Chu Z; School of Life and Health Sciences, Environmental Engineering, Hefei Uiversity, Hefei 230000, China., Shu L; School of Life and Health Sciences, Environmental Engineering, Hefei Uiversity, Hefei 230000, China., Liu Y; School of Life and Health Sciences, Environmental Engineering, Hefei Uiversity, Hefei 230000, China., Jiang P; School of Life and Health Sciences, Environmental Engineering, Hefei Uiversity, Hefei 230000, China., Wang C; School of Life and Health Sciences, Environmental Engineering, Hefei Uiversity, Hefei 230000, China., Li S; School of Life and Health Sciences, Environmental Engineering, Hefei Uiversity, Hefei 230000, China., Liu X; School of Life and Health Sciences, Environmental Engineering, Hefei Uiversity, Hefei 230000, China., Gong H; School of Life and Health Sciences, Environmental Engineering, Hefei Uiversity, Hefei 230000, China., Yang Z; College of Resources and Environment, Key Laboratory of Agricultural Environment in Universities of Shandong, Shandong Agricultural University, Tai'an 271000, China. Electronic address: zkyang@sdau.edu.cn. |
| Πηγή: | Waste management (New York, N.Y.) [Waste Manag] 2026 Sep 30; Vol. 225, pp. 115785. Date of Electronic Publication: 2026 Aug 03. |
| Τύπος έκδοσης: | Journal Article |
| Γλώσσα: | English |
| Στοιχεία περιοδικού: | Publisher: Pergamon Press Country of Publication: United States NLM ID: 9884362 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-2456 (Electronic) Linking ISSN: 0956053X NLM ISO Abbreviation: Waste Manag Subsets: MEDLINE |
| Imprint Name(s): | Original Publication: New York : Pergamon Press, c1989- |
| Ιατρικοί όροι (MeSH): | Sewage*/chemistry , Sewage*/analysis , Metals, Heavy*/analysis , Metals, Heavy*/chemistry , Charcoal*/chemistry , Charcoal*/analysis , Pyrolysis*, Nutrients/analysis ; Nitrogen/analysis ; Fertilizers/analysis ; Temperature |
| Περίληψη: | Addressing the conflict between rising sludge production and its resource utilization, this study evaluated environmental risks and resource potential of sludge-derived biochar. The nutrients and heavy metals in sludge and biochar were systematically analyzed based on mixed industrial-domestic sludge and purely domestic sludge, produced at pyrolysis temperatures from 350°C to 800°C. Results indicated that sludge source critically determined its resource utilization pathway. For mixed sludge, pyrolysis at 550-650°C concentrated total nutrients by 77-82% (peaking at 13-14.5%), whereas domestic sludge retained available nitrogen best at < 450°C, limiting nitrogen loss to < 50%. Pyrolysis reduced environmental risks by stabilizing heavy metals. For mixed sludge at 650°C, residual fractions of Cu, Cr, and Pb exceeded 80%, reducing potential ecological risks (RI) to mild pollution levels (38.98 and 21.14). For domestic sludge at 450°C, Cd and Zn leaching toxicity was effectively passivated to below 0.001 mg/kg and 2 mg/kg, respectively, meeting safety standards. This study confirms that a temperature-based strategy based on source differentiation can simultaneously optimize the nutrient efficiency and environmental safety of sludge-derived biochar, providing important insights and theoretical framework for fertilizer use in future studies. (Copyright © 2026 Elsevier Ltd. All rights reserved.) |
| Competing Interests: | Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. |
| Contributed Indexing: | Keywords: Ecological risk; Heavy metal passivation; Nutrient recovery; Pyrolysis temperature; Resource utilization; Sludge biochar |
| Substance Nomenclature: | 0 (Sewage) 0 (biochar) 0 (Metals, Heavy) 16291-96-6 (Charcoal) N762921K75 (Nitrogen) 0 (Fertilizers) |
| Entry Date(s): | Date Created: 20260803 Date Completed: 20260817 Latest Revision: 20260817 |
| Update Code: | 20260818 |
| DOI: | 10.1016/j.wasman.2026.115785 |
| PMID: | 42546454 |
| Βάση Δεδομένων: | MEDLINE |
| ISSN: | 1879-2456 |
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| DOI: | 10.1016/j.wasman.2026.115785 |