Polyaniline-modified anodes for brewery waste treatment in microbial fuel cells: insights into inoculum selection, cell configuration, and lactic acid valorization

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-12-29 DOI:10.1002/jctb.7805

I. Rafael Garduño-Ibarra, Shruti Tanga, Alexandra Tsitouras, Chris Kinsley, Elena Baranova

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Abstract

BACKGROUND

This study focuses on the treatment of brewery waste slurries (BWS) with high chemical oxygen demand (COD) using a single-chamber microbial fuel cell (MFC) inoculated with heat-treated anaerobic seed sludge. A co-substrate of 5 g L⁻¹ glycerol was added, and carbon felt (CF) was employed as the anode material, enhanced through in situ polymerization of aniline (PANI/CF). Additionally, the adsorption of ruthenium dioxide nanoparticles onto the modified CF was assessed (PANI-RO/CF).

RESULTS

Tests conducted at room temperature (19 °C to 22 °C) achieved an average COD reduction of 36%. The PANI-RO/CF electrode accumulated 24% more charge, resulting in the highest coulombic efficiency of 75.1%, significantly exceeding similar studies. However, the PANI-modified anode generated more energy, exceeding that of the bare CF by more than double, reaching 57.1 mW m⁻². An optimized working volume was identified in relation to other reported works. Microbial population analysis revealed an interaction between Staphylococcus epidermidis and a rarely reported psychrophilic Bacillus species. After 30 h, lactic acid emerged as the main by-product, with a concentration of 7.5 ± 0.6 g L⁻¹.

CONCLUSIONS

These findings highlight an optimization approach based on cell configuration and inoculum selection, as well as a significant valorization pathway that is frequently overlooked in the existing literature on brewery wastewater treatment using MFCs, particularly regarding the attractiveness of lactic acid production. © 2024 The Author(s). Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.