Odstranjevanje potencialno strupenih kovin iz odpadnega blata iz čistilne naprave z uporabo EDTA

Kaurin, Anela (author), Morales Arteaga, Juan Francisco (author), Leštan, Domen (author)

Odpadno blato iz čistilnih naprav (ČN) ima zaradi velike hranilne vrednosti potencial za uporabo v kmetijstvu, vendar je pogosto onesnaženo s potencialno strupenimi kovinami (PSK). V raziskavi smo preverili ali ReSoil® tehnologija, ki temelji na uporabi EDTA (50, 70 in 100 mmol l$^{-1}$ omogoča učinkovito odstranjevanje PSK iz odpadnega blata, vzetega po aerobni (blato1) in anaerobni (blato2) biološki obdelavi. Največji delež odstranitve Pb smo dosegli v blatu1 (do 60 %), največji delež odstranitve Zn in Cu pa v blatu2 (do 55 in 29 %). Vsebnost hranil se po remediaciji ni bistveno spremenila, le vsebnost dostopnega fosforja se je v blatu2 po remediaciji do 1,7-krat zmanjšala, vendar je še vedno ostala velika (489- 510 mg 100$^{-1}$ g$^{-1}$). Po remediaciji so bile koncentracije v izpirkih za vse kovine, razen za Zn, pod mejo za nenevarne snovi. Za dokazovanje možnosti recikliranja procesnih raztopin in EDTA smo blato2 oprali s 50 mmol l$^{-1}$ pralno raztopino v seriji 5 zaporednih remediacij in pri tem v povprečju odstranili 28 % Pb, 48 % Zn, 35 % Cu, 30 % Mn in 10 % Fe. ReSoil® tehnologija sicer omogoča odstranjevanje PSK iz blata in pri tem ohrani njegovo hranilno vrednost, vendar je učinkovitost tehnologije odvisna od postopkov obdelave blata na ČN.

• Language: Slovenian
• Keywords: EDTA, potencialno strupene kovine, remediacija, odpadno blato, čistilne naprave, aerobna biološka obdelava, anaerobna biološka obdelava
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: 14 str.
• Numbering: Vol. 118, No. 4
• PID: 20.500.12556/RUL-143704
• UDC: 631
• ISSN on article: 1854-1941
• DOI: 10.14720/aas.2022.118.4.2705
• COBISS.SI-ID: 136861443
• Publication date in RUL: 09.01.2023

KAURIN, Anela, MORALES ARTEAGA, Juan Francisco and LEŠTAN, Domen, 2022, Odstranjevanje potencialno strupenih kovin iz odpadnega blata iz čistilne naprave z uporabo EDTA. Acta agriculturae Slovenica [online]. 2022. Vol. 118, no. 4. [Accessed 23 March 2025]. DOI 10.14720/aas.2022.118.4.2705. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=143704

Record is a part of a journal

• Title: Acta agriculturae Slovenica
• Publisher: Biotehniška fakulteta, Oddelek za agronomijo in Oddelek za zootehniko, Biotehniška fakulteta, Oddelek za agronomijo in Oddelek za zootehniko, Univerza v Ljubljani, Biotehniška fakulteta, Založba Univerze v Ljubljani
• ISSN: 1854-1941
• COBISS.SI-ID: 219581184

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: English
• Title: Removal of potentially toxic metals from sewage sludge using EDTA

Abstract

Sewage sludge has the potential to be used as a fertilizer in agriculture because of its high nutritional value, but it is often contaminated with toxic metals (TM). This study investigated whether ReSoil® technology, based on the use of EDTA (50, 70, and 100 mmol l$^{-1}$), efficiently removes TM from sewage sludge collected after aerobic (blato1) and anaerobic (blato2) treatment. The highest removal efficiency of Pb was achieved in blato1 (up to 60 %) and of Zn and Cu in blato2 (up to 55 and 29 %, respectively). The content of nutrients did not change significantly after remediation, only available phosphorus decreased up to 1.7-times in blato2, but its content remained high (489-510 mg 100$^{-1}$ g$^{-1}$). After remediation, the concentration of all metals, except Zn, in the leachates was below the limit for non-hazardous substances. To demonstrate the possibility of recycling process solutions and EDTA, blato2 was washed in 5 consecutive batches with 50 mmol l$^{-1}$ washing solution, removing on average 28 % Pb, 48 % Zn, 35 % Cu, 30 % Mn, and 10 % Fe. ReSoil® technology removes metals from sludge and preserves its nutritional value. However, the efficiency of the technology depends on the treatment process used in the wastewater treatment plant.

• Keywords: EDTA, toxic metals, remediation, sewage sludge, wastewater treatment plants, aerobic biological treatment, anaerobic biological treatment