Barbara Fojkar (Author), Domen Leštan (Author)

Abstract

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.

Keywords

sewage sludge;toxic metals;phosphorus;ethylenediaminetetraacetate;aerobic digestion;ReSoil®;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL BF - Biotechnical Faculty
UDC: 628.3:502.175
COBISS: 227243523 Link will open in a new window
ISSN: 0959-6526
Views: 99
Downloads: 1726
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Other data

Secondary language: Slovenian
Secondary keywords: blato komunalnih čistilnih naprav;potencialno strupene kovine;toksične snovi;fosfor;aerobna obdelava;aerobna razgradnja;EDTA;
Type (COBISS): Article
Pages: 9 str.
Volume: ǂVol. ǂ495
Issue: ǂissue ǂ1, [article no.] 145047
Chronology: Mar. 2025
DOI: 10.1016/j.jclepro.2025.145047
ID: 25968310