Integrated chelator-based removal of toxic metals and aerobic digestion of sewage sludge

Fojkar, Barbara (avtor), Leštan, Domen (avtor)

The treatment of sewage sludge (SS) is one of the biggest challenges due to its large output and contamination with toxic metals (TMs). SS is also a potential resource for P, a strategic macronutrient in agriculture. The feasibility of integrated removal of TMs from SS by chelation and washing with ethylenediaminetetraacetate (EDTA) and SS solids reduction by aerobic digestion in bioreactors was investigated. In three consecutive SS treatment batches, an average of 70, 40 and 59% of Zn, Cu and Pb were removed. Cr was not chelated and remained in the SS. EDTA persisted during the aerobic digestion of SS and was efficiently recycled (82% on average) in the pH gradient 12.5 - 2 (ReSoil® method) and reused in the next batch. The reduction of SS solids (on average 18.4% in 6 days) was more efficient with EDTA than with the control treatment (7.4%). The integrated process also increased the concentration of plant-available P in the washed SS by an average of 1.6-fold compared to the control. EDTA induced fragmentation of SS. This resulted in a loss of SS dry matter (on average 26.1%) and total P (on average 24.6%). The novel integrated process efficiently removed TMs that chelate with EDTA, is scalable and should be compatible with current processes in wastewater treatment plants.

• Jezik: Angleški jezik
• Ključne besede: sewage sludge, toxic metals, phosphorus, ethylenediaminetetraacetate, aerobic digestion, ReSoil®
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: BF - Biotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 9 str.
• Številčenje: Vol. 495, art. 145047
• PID: 20.500.12556/RUL-167504
• UDK: 628.3:502.175
• ISSN pri članku: 0959-6526
• DOI: 10.1016/j.jclepro.2025.145047
• COBISS.SI-ID: 227243523
• Datum objave v RUL: 25.02.2025

Gradivo je del revije

• Naslov: Journal of cleaner production
• Skrajšan naslov: J. clean. prod.
• Založnik: Elsevier
• ISSN: 0959-6526
• COBISS.SI-ID: 15470597

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: blato komunalnih čistilnih naprav, potencialno strupene kovine, toksične snovi, fosfor, aerobna obdelava, aerobna razgradnja, EDTA

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: J7-50152
• Naslov: Dekontaminirano biooglje iz blat čistilnih naprav kot učinkovito gnojilo in sredstvo za izboljšanje tal

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P4-0085
• Naslov: Agroekosistemi