Distinctive effects of graphene oxide and reduced graphene oxide on methane production kinetics and pharmaceuticals removal in anaerobic reactors

[Display omitted] •Biologically reduced graphene oxide enhances the methane production rate by 37%.•Bio- and h-reduced graphene oxide methane kinetics were not statistically different.•Graphene oxide addition affects the removal of pharmaceuticals.•Bio- or h-reduced graphene oxide does not enhance t...

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Bibliographic Details
Published in:Bioresource technology 2024-07, Vol.403, p.130849-130849, Article 130849
Main Authors: Casabella-Font, Oriol, Riva, Massimiliano, Balcázar, Jose Luis, Radjenovic, Jelena, Pijuan, Maite
Format: Article
Language:English
Subjects:
Anaerobic biotransformation
Bio-reduced graphene oxide
Direct interspecies electron transfer
Methanogenesis
Micropollutants
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Summary:[Display omitted] •Biologically reduced graphene oxide enhances the methane production rate by 37%.•Bio- and h-reduced graphene oxide methane kinetics were not statistically different.•Graphene oxide addition affects the removal of pharmaceuticals.•Bio- or h-reduced graphene oxide does not enhance the removal of pharmaceuticals.•The addition of graphene oxide impacts the expression of functional genes. Graphene oxide (GO) addition to anaerobic digestion has been suggested to enhance direct electron transfer. The impact of GO (0.075 g GO g−1 VS) and biologically and hydrothermally reduced GO (bio-rGO and h-rGO, respectively) on the methane production kinetics and removal of 12 pharmaceuticals was assessed in Fed-batch reactors. A decrease of 15 % in methane production was observed in the tests with GO addition compared with the control and the h-rGO. However, bio-rGO and h-rGO substantially increased the methane production rate compared to the control tests (+40 %), in the third fed-batch test. Removal of pharmaceuticals was enhanced only during the bio-reduction of GO (1st fed-batch test), whereas once the GO was bio-reduced, it followed a similar trend in the control and h-rGO tests. The addition of GO can enhance the methane production rate and, therefore, reduce the anaerobic treatment time.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2024.130849