Preparation and ecological risk assessment of porous sewage sludge substrate for ecological restoration.

Publisher: Nature Publishing Group Country of Publication: England NLM ID: 101563288 Publication Model: Electronic Cited Medium: Internet ISSN: 2045-2322 (Electronic) Linking ISSN: 20452322 NLM ISO Abbreviation: Sci Rep Subsets: MEDLINE

Original Publication: London : Nature Publishing Group, copyright 2011-

Sewage*/chemistry ; Environmental Restoration and Remediation*/methods; Risk Assessment ; Porosity ; Metals, Heavy/analysis ; Mining

Competing Interests: Declarations. Competing interests: The authors declare no competing interests.
Mining activities often bring great pressure to the surrounding ecological environment, so it is necessary to carry out ecological restoration in mining areas. In this study, a constructed technosol (denoted SAS) for ecological restoration was prepared with municipal sludge as main materials, and its properties and ecological risk was assessed. The results showed that the optimal conditions for preparation were as follows: raw material ratio of 0.04, water-cement ratio of 0.01, aluminum powder dosage of 0.03%, curing temperature of 40 ℃, curing time of 24 h. The solidification of cement contributed to the connection path between the sludge particles, and the bubbles generated by aluminum powder further formed the microscopic pore structure. Heavy metals chemical species analysis concluded that As, Cd and Pb were immobilized, while Cu and Ni were tended to be activated, assessment result indicated low risk level. The transformation of macromolecular organic matter into humus was beneficial to improve the structure and biological activity, and the pot experiment result also displayed the low toxicity to plants. This work enriched the research system of ecological restoration in mining areas and provides a new strategy for the recycling of municipal sludge.
(© 2025. The Author(s).)

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202303021212253 Basic Research Plan (Free Exploration) Project of Shanxi Province, China; 202403021211221 Basic Research Plan (Free Exploration) Project of Shanxi Province, China; 2023GXYF03 Key R&D Project of Luliang City, China

Keywords: Ecological restoration; Ecological risk; Heavy metal; Municipal sludge; Organic matter; Plant toxicity

0 (Sewage)
0 (Metals, Heavy)

Date Created: 20250426 Date Completed: 20250427 Latest Revision: 20250429

20250429

PMC12033222

10.1038/s41598-025-98983-0

40287508