Juan Francisco Morales Arteaga (Avtor), Dominik Vodnik (Avtor), Damijana Kastelec (Avtor), Mojca Zupanc (Avtor), Matevž Dular (Avtor), Jernej Ortar (Avtor), Marija Đurić (Avtor), Anela Kaurin (Avtor), Rok Mihelič (Avtor), Domen Leštan (Avtor)

Povzetek

Sewage sludge (SS) is rich in plant nutrients, including P, N, and organic C, but often contains toxic metals (TMs), which hinders its potential use in agriculture. The efficiency of removal of TMs by washing with ethylenediamine tetraacetate (EDTA), in combination with hydrodynamic cavitation (HC) and the usability of washed sewage sludge as fertilizer were investigated. The environmental risk was assessed. During 8 wash batches an average 35, 68, 47 and 45 % of Pb, Zn, Cd and Cu, respectively, as well as 22 and 5 % Mn and Fe were removed from the SS. The process solutions and EDTA were recycled at a pH gradient of 12.5–2, which was achieved by adding quicklime (CaO) and then acidification by H$_2$SO$_4$, so that no wastewater was produced, only solid waste (ReSoil® method). The quality of the recycled process solutions (they remained unsaturated with salts) and the efficiency of the washing process were maintained across all batches. On average, 46 % of the EDTA was lost during the process and was replenished. The initial leachability of EDTA-mobilized Pb, Zn, Cu, Cr and Fe remaining in the washed SS increased 6-, 17-, 3-, 11- and 11-fold, respectively, but not to hazardous levels except for Zn. After washing, P and K remained in the SS, plant-available P increased 3.3-fold, while total N and C were reduced by 20.28 and 2.44 %, respectively. Washed SS was used as fertilizer in the pot experiment. The yield of Brassica juncea did not improve, the uptake of TMs by the plants and the leaching of TMs from the soil were minimal. Our study highlighted the drawbacks and potential feasibility of the new SS washing method

Ključne besede

sewage sludge;toxic metals;EDTA;hydrodynamic cavitation;ReSoil®;soil fertilization;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UL BF - Biotehniška fakulteta
UDK: 631.4
COBISS: 188503043 Povezava se bo odprla v novem oknu
ISSN: 0048-9697
Št. ogledov: 232
Št. prenosov: 174
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: blato iz čistilnih naprav;toksične snovi;toksične kovine;hidrodinamična kavitacija;čiščenje blata;gnojilo;
Vrsta dela (COBISS): Članek v reviji
Strani: 10 str.
Letnik: ǂart. noǂ171444
Zvezek: ǂVol. ǂ923
Čas izdaje: 2024
DOI: 10.1016/j.scitotenv.2024.171444
ID: 23126074