Szczegóły publikacji
Opis bibliograficzny
From waste to value: harnessing the sorption potential of ferruginous sludges for sustainable heavy metal remediation / T. BAJDA, M. LIKUS, M. SKALNY, M. SOBCZYK // W: The 19th IWA conference on Sludge management [Dokument elektroniczny] : toward material cycle and low carbon society : 21st–24th October 2025, Kyoto, Japan. — Wersja do Windows. — Dane tekstowe. — [Japan : IWA The International Water Association], [2025]. — S. 1–4. — Wymagania systemowe: Adobe Reader. — Tryb dostępu: https://pub.confit.atlas.jp/en/event/iwa19/presentation/7-3-02 [2026-01-12]. — Bibliogr. s. 4, Abstr. — Dostęp po zalogowaniu
Autorzy (4)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 165388 |
|---|---|
| Data dodania do BaDAP | 2026-01-15 |
| Rok publikacji | 2025 |
| Typ publikacji | materiały konferencyjne (aut.) |
| Otwarty dostęp |  |
| Wydawca | IWA Publishing |
Abstract
Groundwater treatment processes generate large volumes of ferruginous sludges (GWTRs), rich in amorphous iron oxyhydroxides, which are currently treated as waste despite their strong affinity for metal ions. This study evaluates GWTRs from ten water treatment plants as lowcost sorbents for toxic metals (Cd, Cu, Pb, Zn, Cr). It provides a comprehensive description of their mineralogical, physicochemical, and sorptive properties. Multi-technique analyses (XRD, XRF, FTIR, BET, SEM-EDS, XPS) revealed that the sludges consist mainly of ferrihydrite with minor quartz and calcite, showing specific surface areas of 49–246 m²/g and mesoporous textures (type II–IV isotherms with H3 hysteresis). Batch experiments demonstrated rapid and efficient removal of metals (up to 230 g/kg) under mild conditions (pH 5–8, 25 °C), with kinetics following a pseudo-second-order model and equilibrium data fitting the Langmuir isotherm, confirming chemisorption on homogeneous surfaces. Thermodynamic parameters (ΔG < 0, ΔH > 0) indicated that adsorption is spontaneous and endothermic. Post-sorption analyses revealed metal immobilization through inner-sphere complexation, co-precipitation with Fe phases, and incorporation into ferrihydrite structure. The results demonstrate that GWTRs can be transformed from problematic waste into efficient sorbents for heavy metal removal, offering a circular economy pathway for waste valorization and sustainable sludge management.
