Efficient In Situ Utilization of Caustic for Sequential Recovery and Separation of Sn, Fe, and Cu in Microbial Fuel Cells

Abstract

A novel strategy to sequentially recover and separate Sn(II), Fe(II) and Cu(II) from a synthetic wastewater from printed circuit board (PrCB) manufacturing in a single microbial fuel cell (MFCSn)‐MFCFe‐MFCCu process was achieved, where in‐situ produced caustic was primarily utilized for Sn precipitation (MFCSn) and then secondly used for Fe deposition (MFCFe) and anaerobic Cu(II) reduction in the final MFCCu. An external resistance of 1000 Ω in the MFCSn and MFCFe, and a 10 Ω resistor in the MFCCu achieved predominant recovery of Sn (MFCSn: 80.8±0.8 %), Fe (MFCFe: 59.1±0.8 %), and Cu (MFCCu: 68.2±1.8 %) in the three MFCs, with separation factors of 32.1±1.6 for Sn (MFCSn) and 7.5±1.8 for Fe (MFCFe), and complete recovery of Cu (MFCCu, 42‐mesh cathodes). The metal concentrations in the final effluent were below national discharge limits (Sn, 2.0 mg/L; Fe, 5.0 mg/L; Cu, 0.2 mg/L). The metal recoveries ranged from 2.6 (Sn, MFCSn)–12.0 (Cu, MFCCu), and the separation factors were 8.4 (Sn, MFCSn)–∞ (Cu, MFCCu) times those of the open circuit controls. Cathodes with 120‐mesh size of stainless steel mesh produced lower metal recoveries [33.7 % (Sn, MFCSn) and 27.0 % (Fe, MFCFe) decrease] and separation factors than MFCs with 42‐mesh cathodes. This study provides a viable approach for efficiently recovering and separating Sn, Fe and Cu from stripping solutions produced in PrCB manufacturing, with simultaneous power production.

Acetate production from inorganic carbon (HCO3-) in photo-assisted biocathode microbial electrosynthesis systems using WO3/MoO3/g-C3N4 heterojunctions and Serratia marcescens species

“…X-ray diffraction (XRD) characterizations were performed on a powder X-ray diffractometer (XRD-6000, Shimadzu, Japan) with CuKα radiation under the operation conditions of 40 kV and 50 mA. The chemical components of the synthesized W/Mo oxides, g-C3N4 and WO3/MoO3/g-C3N4 were analyzed using X-ray photoelectron spectroscopy (XPS, Kratos AXIS Ultra DLD) [33]. The UVvis diffuse reflectance spectroscopy (DRS) were measured by an Agilent HP 8453 UV -vis spectrophotometer.…”

RETRACTED: Effect of Geobacter metallireducens nanowire on electron transfer efficiency in microbial fuel cell

“…Ineffective extracellular electron transport will negatively impact intracellular electron transport, thus preventing the bacterium from synthesizing adenosine triphosphate (ATP), which is the energy source of activities for metabolism and growth 24 . The low electron acceptors for the bioavailability lead to inefficient extracellular electron transport and inactive vital movement of bacteria, along with reducing the efficiency of bio‐leaching and environmental remediation 25 …”

Intensified degradation and mineralization of antibiotic metronidazole in photo-assisted microbial fuel cells with Mo-W catalytic cathodes under anaerobic or aerobic conditions in the presence of Fe(III)

“…10 In summary, the comprehensive results presented in this study through multiple Here Fig. 11 The practical application of the combined photo-assisted MFCs and Fenton-MFCs process for degradation and mineralization of contaminants of emerging concern is favored by the use of the two-chamber MFC system, which in contrast to the one-chamber system allow the simultaneous treatment of two different wastewaters and the control over the toxicity of the water contaminants to the anodic exoelectrogens species [38][39][40][41][56][57][58]60]. However, the practical implementation of this technology for industrial wastewater treatment requires further pilot and full-scale investigations, to evaluate the long-term operation and stability of the system over a feed with fluctuating characteristics and the process economics [54,58,[61][62][63].…”

“…The graphite felts at the anode were connected with a carbon rod and at the cathode with a titanium wire, and the external circuit was closed through a 200 Ω resistor. The use of the 200 Ω resistor resulted in optimal operation, in comparison to lower (10 Ω) or higher (500 Ω) resistors [41][42]. With such resistor consistently higher rates of MNZ degradation and CE an were achieved [ Fig.…”