Comparative evaluation of fibrous artificial carbons and bamboo charcoal in terms of recovery of current from sewage wastewater

Abstract

In this study, two fibrous carbon anodes (namely (PNWG) and carbon brush (CB) made from artificial carbon) and bamboo charcoal (BC) were evaluated for current recovery from sewage wastewater. When these anodes were polarized at 0.2 V vs. Ag/AgCl in sewage wastewater, CB produced a maximum current of 2.9 1.5 1.4 A/m 2 . This exceeded that produced by PNWG ( A/m 2 ) and BC ( A/m 2 ). The CB was superior to those achieved with the accumulative charge recovery achieved with other two 1.6-2.2-NWG BC ( and fold higher than that with P and , respectively). During the cyclic voltammetry analysis, CB demonstrated the highest catalytic current with maximum -0.6 0.4 potential in the range of to V vs. Ag/AgCl and the smallest anode resistance (0.20 Ω that the fibrous anodes (CB and PNWG) m 2 ). Direct cell counting revealed attached most the anodes (80%), whereas BC the proportion of of the cells in did not. In contrast,Geobacter species, a representative electrogenic microorganism in the total bacteria, was similar among the three anodes (4.4-5.8%). The observed to be tubular microbial fuel cell (ϕ 5.0 cm core wrapped with an anion exchange ) equipped with an air-chamber membrane A/ 2 . This is higher than those reported in the (AEM) and the CB delivered a current of 1.8 m existing literature for the same microbial fuel cell (MFC) configuration. This indicates that the anode from planar the current the alteration of to brush can contribute toward improving recovery The BC needs improvement to have more through the air-cathode-AEM-MFC. specific surface area, whereas it showed superiority in cost efficiency considering material and processing.

Isolation and Polyphasic Characterization of Desulfuromonas versatilis sp. Nov., an Electrogenic Bacteria Capable of Versatile Metabolism Isolated from a Graphene Oxide-Reducing Enrichment Culture

“…Potential electron acceptors were evaluated by observing growth and detecting the oxidation of 5.0 mM acetate in the presence of 10 mM fumarate, 5 mM nitrate, 10 mM sulfate, 10 mM thiosulfate, 5.0 mM AQDS, and 10 mM malate. Production of electric current by the strain NIT-T3 was evaluated via electrochemical cultivation using a graphite plate inoculated with NIT-T3, as described previously [35].…”

Simultaneous removal of organic matter and nitrogen compounds by partitioned aeration in a 226 L-scale microbial fuel cell

“… 39 The high energy-consumption efficiency is attributed to the lack of aeration in the system. Thus, decreasing the aeration rate in the present reactor or lack of aeration and shortening the HRT by increasing biomass with more anode specific surface area 40 are required to reduce energy consumption and increase energy production.…”

Effect of Ion Selectivity on Current Production in Sewage Microbial Fuel Cell Separators

“…The MFC AEM used in this study produced an average of 0.38 A/m 2 for 6 h of HRT. This was unexpected because the increase in the anodic area caused by introducing the carbon brushes has been demonstrated in several studies [35,36]. The similarity in current production, despite the increase in the anodic area, was due to the reaction restriction of the cathode.…”