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Domestic wastewater treatment using multi-electrode continuous flow MFCs with a separator electrode assembly design.
Appl Microbiol Biotechnol. 2013 Jan; 97(1):409-16.AM

Abstract

Treatment of domestic wastewater using microbial fuel cells (MFCs) will require reactors with multiple electrodes, but this presents unique challenges under continuous flow conditions due to large changes in the chemical oxygen demand (COD) concentration within the reactor. Domestic wastewater treatment was examined using a single-chamber MFC (130 mL) with multiple graphite fiber brush anodes wired together and a single air cathode (cathode specific area of 27 m(2)/m(3)). In fed-batch operation, where the COD concentration was spatially uniform in the reactor but changed over time, the maximum current density was 148 ± 8 mA/m(2) (1,000 Ω), the maximum power density was 120 mW/m(2), and the overall COD removal was >90 %. However, in continuous flow operation (8 h hydraulic retention time, HRT), there was a 57 % change in the COD concentration across the reactor (influent versus effluent) and the current density was only 20 ± 13 mA/m(2). Two approaches were used to increase performance under continuous flow conditions. First, the anodes were separately wired to the cathode, which increased the current density to 55 ± 15 mA/m(2). Second, two MFCs were hydraulically connected in series (each with half the original HRT) to avoid large changes in COD among the anodes in the same reactor. The second approach improved current density to 73 ± 13 mA/m(2). These results show that current generation from wastewaters in MFCs with multiple anodes, under continuous flow conditions, can be improved using multiple reactors in series, as this minimizes changes in COD in each reactor.

Authors+Show Affiliations

Department of Civil and Environmental Engineering, Penn State University, 212 Sackett Building, University Park, PA 16802, USA.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23053104

Citation

Ahn, Yongtae, and Bruce E. Logan. "Domestic Wastewater Treatment Using Multi-electrode Continuous Flow MFCs With a Separator Electrode Assembly Design." Applied Microbiology and Biotechnology, vol. 97, no. 1, 2013, pp. 409-16.
Ahn Y, Logan BE. Domestic wastewater treatment using multi-electrode continuous flow MFCs with a separator electrode assembly design. Appl Microbiol Biotechnol. 2013;97(1):409-16.
Ahn, Y., & Logan, B. E. (2013). Domestic wastewater treatment using multi-electrode continuous flow MFCs with a separator electrode assembly design. Applied Microbiology and Biotechnology, 97(1), 409-16. https://doi.org/10.1007/s00253-012-4455-8
Ahn Y, Logan BE. Domestic Wastewater Treatment Using Multi-electrode Continuous Flow MFCs With a Separator Electrode Assembly Design. Appl Microbiol Biotechnol. 2013;97(1):409-16. PubMed PMID: 23053104.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Domestic wastewater treatment using multi-electrode continuous flow MFCs with a separator electrode assembly design. AU - Ahn,Yongtae, AU - Logan,Bruce E, Y1 - 2012/10/11/ PY - 2012/07/10/received PY - 2012/09/19/accepted PY - 2012/09/11/revised PY - 2012/10/12/entrez PY - 2012/10/12/pubmed PY - 2013/6/5/medline SP - 409 EP - 16 JF - Applied microbiology and biotechnology JO - Appl Microbiol Biotechnol VL - 97 IS - 1 N2 - Treatment of domestic wastewater using microbial fuel cells (MFCs) will require reactors with multiple electrodes, but this presents unique challenges under continuous flow conditions due to large changes in the chemical oxygen demand (COD) concentration within the reactor. Domestic wastewater treatment was examined using a single-chamber MFC (130 mL) with multiple graphite fiber brush anodes wired together and a single air cathode (cathode specific area of 27 m(2)/m(3)). In fed-batch operation, where the COD concentration was spatially uniform in the reactor but changed over time, the maximum current density was 148 ± 8 mA/m(2) (1,000 Ω), the maximum power density was 120 mW/m(2), and the overall COD removal was >90 %. However, in continuous flow operation (8 h hydraulic retention time, HRT), there was a 57 % change in the COD concentration across the reactor (influent versus effluent) and the current density was only 20 ± 13 mA/m(2). Two approaches were used to increase performance under continuous flow conditions. First, the anodes were separately wired to the cathode, which increased the current density to 55 ± 15 mA/m(2). Second, two MFCs were hydraulically connected in series (each with half the original HRT) to avoid large changes in COD among the anodes in the same reactor. The second approach improved current density to 73 ± 13 mA/m(2). These results show that current generation from wastewaters in MFCs with multiple anodes, under continuous flow conditions, can be improved using multiple reactors in series, as this minimizes changes in COD in each reactor. SN - 1432-0614 UR - https://www.unboundmedicine.com/medline/citation/23053104/Domestic_wastewater_treatment_using_multi_electrode_continuous_flow_MFCs_with_a_separator_electrode_assembly_design_ DB - PRIME DP - Unbound Medicine ER -