Treatment of Acid Mine Drainage in a Bioelectrochemical System, Based on an Anodic Microbial Sulfate Reduction

• Autorzy: Angelov Anatoliy , Bratkova Svetlana , Ivanov Rosen , Velichkova Polina

Identyfikatory

DOI

10.12911/22998993/164755

• Języki publikacji: EN

Abstrakty

EN

The possibilities of simultaneous removal of sulfates and heavy metals (Cu, Ni, Zn) from acid mine drainage have been investigated in two-section bioelectrochemical system (BES). The used BES is based on the microbial sulfate reduction (MSR) process in the anode zone and abiotic reduction processes in the cathodic zone. In the present study, the model acid mine drainage with high sulfate (around 4.5 g/l) and heavy metals (Cu²⁺, Ni²⁺ and Zn²⁺) content was performed. As a separator in the laboratory, BES used an anionic exchange membrane (AEM), and for electron donor in the process of microbial sulfate reduction in the bioanode zone – waste ethanol stillage from the distillery industry was employed. In this study, the possibility of sulfates removal from the cathodic zone was established by their forced migration through AEM to the anode zone. Simultaneously, as a result of the MSR process, the sulfate ions passed through AEM are reduced to H₂S in the anode zone. The produced H₂S, having its role as a mediator in electron transfer, is oxidized on the anode surface to S⁰ and other forms of sulfur. The applicability of waste ethanol stillage as a cheap and affordable organic substrate for the MSR process has also been established. Heavy metals (Cu²⁺, Ni²⁺ and Zn²⁺) occur in the cathode chamber of BES in different degrees of the removal. As a microbial fuel cell (MFC) operating for 120 hours, the reduction rate of Cu²⁺ reaches 94.6% (in waste ethanol stillage) and 98.6% (in the case of Postgate culture medium). On the other hand, in terms of Ni²⁺ and Zn²⁺, no significant decrease in their concentrations in the liquid phase is found. In the case of microbial electrolysis cell (MEC) mode reduction of Cu²⁺– 99.9%, Ni²⁺– 65.9% and Zn²⁺– 64.0% was achieved. For 96 hours, the removal of sulfates in MEC mode reached 69.9% in comparison with MFC mode – 35.2%.

Słowa kluczowe

EN

BES; bioelectrochemical system; MFC; microbial fuel cell; MEC; microbial electrolysis cell; ethanol stillage; microbial sulfate reduction; acid mine drainage; heavy metals; sulphate

• Wydawca: Polskie Towarzystwo Inżynierii Ekologicznej ; Lublin University of Technology
• Czasopismo: Journal of Ecological Engineering
• Rocznik: 2023
• Tom: Vol. 24, nr 7
• Strony: 175--186
• Opis fizyczny: Bibliogr. 36 poz., rys., tab.

Twórcy

autor

Angelov Anatoliy

• Department of Engineering Geoecology, University of Mining and Geology, St. Ivan Rilski, Sofia 1700, Bulgaria

• https://orcid.org/0000-0002-2608-9985

autor

Bratkova Svetlana

• Department of Engineering Geoecology, University of Mining and Geology, St. Ivan Rilski, Sofia 1700, Bulgaria

• https://orcid.org/0000-0003-3469-7216

autor

Ivanov Rosen

• Department of Engineering Geoecology, University of Mining and Geology, St. Ivan Rilski, Sofia 1700, Bulgaria

autor

Velichkova Polina

• Department of Engineering Geoecology, University of Mining and Geology, St. Ivan Rilski, Sofia 1700, Bulgaria

• https://orcid.org/0000-0003-1059-0027

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