Sulfate reduction in a sludge gradually acclimated to acetate as the sole electron donor and its potential application as inoculum in a microbial fuel cell

Abstract

Modelado de la biodegradación en biorreactores de lodos de hidrocarburos totales del petróleo intemperizados en suelos y sedimentos (Biodegradation modeling of sludge bioreactors of total petroleum hydrocarbons weathering in soil and sediments)

Voltage production and simultaneous municipal wastewater treatment in microbial fuel cells performed with Clostridium strains

“…The percentages of COD removal obtained in all MFC's (Table 4) were lower in comparison with the 80% reported by Buitrón and Pérez (2011), the difference in removal efficiency can be attributed to the nature of substrate and inoculum source, since they enriched municipal wastewater with glucose from 430 to 2250 mg L −1 COD concentration and employed a native consortia. Moreover, COD removal efficiencies obtained in this study, are in the range reported previously by González-Paz et al (2020), who operated MFC with sludge, acetate and butyrate.…”

“…In this kind of cells organic matter is oxidized in anodic chamber by anaerobic bacteria producing carbon dioxide, protons and electrons; these last ones are transferred through an electrical circuit from the anode to the cathode where combines with protons and oxygen to produce water (Gómora-Hernández et al, 2020;Valdez-Ojeda et al, 2014). In agreement to He et al, 2017, MFC are a sustainable technology for wastewater treatment due to the following advantages: high capability to transform organic matter into voltage or current, energy input is not necessary and can be applied in locations with insufficient electrical infrastructures (González-Paz et al, 2020). Microbial Electrolysis Cell (MEC) is another type of BES which has been extensively studied in the last years.…”

Sulfate-rich wastewater treatment using an integrated anaerobic/aerobic biological system

“…Lu et al (2017) obtained a sulfidogenic activity of 0.41 g S 2− -COD/g VSS•d, which is significantly higher than the activities obtained in this study under similar conditions. The low sulfidogenic activity might be attributed to the low content of SRB in the sludge (González-Paz et al, 2020). Given that the VSS represents the fraction of TSS present as biomass, all three sludges presented a low VSS/TSS ratio (Garzón et al, 2015).…”

Influence of the cellulose and sulfate ratio on voltage generation in Winogradsky columns

“…These devices and microbial fuel cells represent an alternative for electricity generation during the removal of organic waste (Gómora-Hernández et al, 2020;González-Paz et al, 2020). Therefore, strategies have been sought to increase energy generation such as: greater oxygenation in the cathodic zone through the light that favors the activity of photosynthetic microorganisms (Commault et al, 2014;Wang et al, 2014); and type and concentration of the substrate (Ribot-Llobet et al, 2014;Sajana et al, 2014).…”

“…In the Winogradsky column, carbon and sulfur cycles occur simultaneously through a source of cellulose and sulfate that encourages the development of sulfur microbial communities (Rogan et al, 2005;Rundell et al, 2014). The use of sulfate in microbial fuel cells has been suggested because sulfide generated by sulfate-reducing bacteria proved to be an efficient redox mediator to the anode (González-Paz et al, 2020) and capable of changing the anodic potential (An et al, 2013;Bratkova et al, 2019). Therefore, the sulfate concentration in the sediment could modify the microbial community and improve voltage generation.…”