Reduction of start-up time through bioaugmentation process in microbial fuel cells using an isolate from dark fermentative spent media fed anode

2015 ◽  
Vol 72 (1) ◽  
pp. 106-115 ◽  
Author(s):  
Soumya Pandit ◽  
Santimoy Khilari ◽  
Shantonu Roy ◽  
M. M. Ghangrekar ◽  
Debabrata Pradhan ◽  
...  
Keyword(s):  
Current Density ◽  
Microbial Fuel Cells ◽  
Electrochemical Impedance ◽  
Pseudomonas Sp ◽  
Ionization Time ◽  
Start Up ◽  
Electrochemically Active ◽  
Electrochemical Impedance Spectroscopic ◽  
Spent Media ◽  
Isolated Species

Abstract An electrochemically active bacteria Pseudomonas aeruginosa IIT BT SS1 was isolated from a dark fermentative spent media fed anode, and a bioaugmentation technique using the isolated strain was used to improve the start-up time of a microbial fuel cell (MFC). Higher volumetric current density and lower start-up time were observed with the augmented system MFC-PM (13.7 A/m3) when compared with mixed culture MFC-M (8.72 A/m3) during the initial phase. This enhanced performance in MFC-PM was possibly due to the improvement in electron transfer ability by the augmented strain. However, pure culture MFC-P showed maximum volumetric current density (17 A/m3) due to the inherent electrogenic properties of Pseudomonas sp. An electrochemical impedance spectroscopic (EIS) study, along with matrix-assisted laser desorption/ionization-time-of-flight (MALDI-TOF) analysis, supported the influence of isolated species in improving the MFC performance. The present study indicates that the bioaugmentation strategy using the isolated Pseudomonas sp. can be effectively utilized to decrease the start-up time of MFC.

scholarly journals Controlled Layer-By-Layer Deposition of Carbon Nanotubes on Electrodes for Microbial Fuel Cells

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 363 ◽  
Author(s):  
Wenguo Wu ◽  
Hao Niu ◽  
Dayun Yang ◽  
Shi-Bin Wang ◽  
Jiefu Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fuel Cells ◽  
Modified Electrode ◽  
Current Density ◽  
Indium Tin Oxide ◽  
Microbial Fuel Cells ◽  
Electrochemical Impedance ◽  
Layer By Layer ◽  
Peak Current ◽  
Ito Electrode

Carbon nanotubes (CNTs) and polyelectrolyte poly(allylamine hydrochloride) (PAH) composite modified indium tin oxide (ITO) electrodes, by a layer-by-layer (LBL) self-assembly technique, was evaluated as an anode for microbial fuel cells (MFCs). The bioelectrochemistry of Shewanella loihica PV-4 in an electrochemical cell and the electricity generation performance of MFCs with multilayer (CNTs/PAH)n-deposited ITO electrodes as an anode were investigated. Experimental results showed that the current density generated on the multilayer modified electrode increased initially and then decreased as the deposition of the number of layers (n = 12) increased. Chronoamperometric results showed that the highest peak current density of 34.85 ± 2.80 mA/m2 was generated on the multilayer (CNTs/PAH)9-deposited ITO electrode, of which the redox peak current of cyclic voltammetry was also significantly enhanced. Electrochemical impedance spectroscopy analyses showed a well-formed nanostructure porous film on the surface of the multilayer modified electrode. Compared with the plain ITO electrode, the multilayered (CNTs/PAH)9 anodic modification improved the power density of the dual-compartment MFC by 29%, due to the appropriate proportion of CNTs and PAH, as well as the porous nanostructure on the electrodes.

scholarly journals Enhancement of the Start-Up Time for Microliter-Scale Microbial Fuel Cells (µMFCs) via the Surface Modification of Gold Electrodes

Micromachines ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 703
Author(s):  
Begüm Şen-Doğan ◽  
Meltem Okan ◽  
Nilüfer Afşar-Erkal ◽  
Ebru Özgür ◽  
Özge Zorlu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Microelectromechanical Systems ◽  
Electrochemical Impedance ◽  
Shewanella Oneidensis ◽  
Bacterial Attachment ◽  
Anode Surface ◽  
Sem Images ◽  
Start Up

Microbial Fuel Cells (MFCs) are biological fuel cells based on the oxidation of fuels by electrogenic bacteria to generate an electric current in electrochemical cells. There are several methods that can be employed to improve their performance. In this study, the effects of gold surface modification with different thiol molecules were investigated for their implementation as anode electrodes in micro-scale MFCs (µMFCs). Several double-chamber µMFCs with 10.4 µL anode and cathode chambers were fabricated using silicon-microelectromechanical systems (MEMS) fabrication technology. µMFC systems assembled with modified gold anodes were operated under anaerobic conditions with the continuous feeding of anolyte and catholyte to compare the effect of different thiol molecules on the biofilm formation of Shewanella oneidensis MR-1. Performances were evaluated using polarization curves, Electrochemical Impedance Spectroscopy (EIS), and Scanning Electron Microcopy (SEM). The results showed that µMFCs modified with thiol self-assembled monolayers (SAMs) (cysteamine and 11-MUA) resulted in more than a 50% reduction in start-up times due to better bacterial attachment on the anode surface. Both 11-MUA and cysteamine modifications resulted in dense biofilms, as observed in SEM images. The power output was found to be similar in cysteamine-modified and bare gold µMFCs. The power and current densities obtained in this study were comparable to those reported in similar studies in the literature.

scholarly journals Adding Zero-Valent Iron to Enhance Electricity Generation during MFC Start-Up

2020 ◽  
Vol 17 (3) ◽  
pp. 806 ◽  
Author(s):  
Chao Li ◽  
Kang Zhou ◽  
Hanyue He ◽  
Jiashun Cao ◽  
Shihua Zhou
Keyword(s):  
Microbial Fuel Cells ◽  
Electricity Generation ◽  
High Throughput Sequencing ◽  
Electrochemical Impedance ◽  
Impedance Analysis ◽  
Zero Valent Iron ◽  
Sequencing Analysis ◽  
Sem Images ◽  
Oxidation Reduction ◽  
Start Up

The low power generation efficiency of microbial fuel cells (MFCs) is always a barrier to further development. An attempt to enhance the start-up and electricity generation of MFCs was investigated by adding different doses of zero-valent iron into anaerobic anode chambers in this study. The results showed that the voltage (289.6 mV) of A2 with 0.5 g of zero-valent iron added was higher than the reference reactor (197.1 mV) without dosing zero-valent iron (A4). The maximum power density of 27.3 mW/m2 was obtained in A2. CV analysis demonstrated that A2 possessed a higher oxidation–reduction potential, hence showing a stronger oxidizing property. Meanwhile, electrochemical impedance analysis (EIS) also manifested that values of RCT of carbon felts with zero-valent iron supplemented (0.01–0.03 Ω) were generally lower. What is more, SEM images further proved and illustrated that A2 had compact and dense meshes with a hierarchical structure rather than a relatively looser biofilm in the other reactors. High-throughput sequencing analysis also indicated that zero-valent iron increased the abundance of some functional microbial communities, such as Acinetobacter, Ignavibacteriales, Shewanella, etc.

scholarly journals Carbonaceous and Protein Constituents in Dairy Wastewater Lead to a Differentiated Current Generation in Microbial Fuel Cells (MFCs)

2017 ◽  
Vol 58 (3) ◽  
Author(s):  
Bibiana Cercado ◽  
Ana Laura Vega-Guerrero ◽  
Francisco Rodríguez-Valadez ◽  
José Luis Hernández- López ◽  
Luis Felipe Cházaro-Ruiz ◽  
...  
Keyword(s):  
Current Density ◽  
Microbial Fuel Cells ◽  
Protein Concentration ◽  
Dairy Wastewater ◽  
Half Cell ◽  
High Protein Concentration ◽  
Start Up ◽  
Anodic Chamber ◽  
Synthetic Media ◽  
Peak Pattern

<p>The effect of real dairy wastewater (DWW) additions on the current density generated by a bioanode was evaluated in a half cell configuration under potentiostatic control, thus simulating the anodic chamber of a Microbial Fuel Cell. Low substrate additions increased current density up to 1655 ± 136 mA m<sup>-2</sup>, forming a two-current peak pattern. Then the system was tested with a casein-lactose synthetic media. A high protein concentration reduced the current density; individual compounds led to the highest current (330.5 mA m<sup>-2</sup> with casein; 1276 mA m<sup>-2</sup> with lactose). Moreover, the protein reduced the current start up time.</p>

Monitoring microbial growth on a microfluidic lab-on-chip with electrochemical impedance spectroscopic technique

2021 ◽  
Vol 23 (2) ◽  
Author(s):  
Subhan Shaik ◽  
Aarthi Saminathan ◽  
Deepak Sharma ◽  
Jagdish A Krishnaswamy ◽  
D Roy Mahapatra
Keyword(s):  
Microbial Growth ◽  
Electrochemical Impedance ◽  
Spectroscopic Technique ◽  
Lab On Chip ◽  
On Chip ◽  
Electrochemical Impedance Spectroscopic

scholarly journals Cellulose Derived Graphene/Polyaniline Nanocomposite Anode for Energy Generation and Bioremediation of Toxic Metals via Benthic Microbial Fuel Cells

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 135
Author(s):  
Asim Ali Yaqoob ◽  
Mohamad Nasir Mohamad Ibrahim ◽  
Khalid Umar ◽  
Showkat Ahmad Bhawani ◽  
Anish Khan ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Current Density ◽  
Toxic Metals ◽  
Microbial Fuel Cells ◽  
Organic Substrate ◽  
Synthetic Wastewater ◽  
Multiple Parameters ◽  
Pani Composite ◽  
Industrial Level ◽  
Modified Graphene

Benthic microbial fuel cells (BMFCs) are considered to be one of the eco-friendly bioelectrochemical cell approaches nowadays. The utilization of waste materials in BMFCs is to generate energy and concurrently bioremediate the toxic metals from synthetic wastewater, which is an ideal approach. The use of novel electrode material and natural organic waste material as substrates can minimize the present challenges of the BMFCs. The present study is focused on cellulosic derived graphene-polyaniline (GO-PANI) composite anode fabrication in order to improve the electron transfer rate. Several electrochemical and physicochemical techniques are used to characterize the performance of anodes in BMFCs. The maximum current density during polarization behavior was found to be 87.71 mA/m2 in the presence of the GO-PANI anode with sweet potato as an organic substrate in BMFCs, while the GO-PANI offered 15.13 mA/m2 current density under the close circuit conditions in the presence of 1000 Ω external resistance. The modified graphene anode showed four times higher performance than the unmodified anode. Similarly, the remediation efficiency of GO-PANI was 65.51% for Cd (II) and 60.33% for Pb (II), which is also higher than the unmodified graphene anode. Furthermore, multiple parameters (pH, temperature, organic substrate) were optimized to validate the efficiency of the fabricated anode in different environmental atmospheres via BMFCs. In order to ensure the practice of BMFCs at industrial level, some present challenges and future perspectives are also considered briefly.

scholarly journals Corrosion Behavior of AA 1100 Anodized in Gallic-Sulfuric Acid Solution

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 405
Author(s):  
Marlon L. Mopon ◽  
Jayson S. Garcia ◽  
Dexter M. Manguerra ◽  
Cyril John C. Narisma
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Gallic Acid ◽  
Acid Concentration ◽  
Sulfuric Acid Solution ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Anodized Aluminum ◽  
The Common

Sulfuric acid anodization is one of the common methods used to improve corrosion resistance of aluminum alloys. Organic acids can be added to the sulfuric acid electrolyte in order to improve the properties of the anodized aluminum produced. In this study, the use of gallic acid as an additive to the sulfuric acid anodization of AA1100 was explored. The effect of varying anodization current density and gallic acid concentration on the properties of anodized aluminum samples was observed using electrochemical impedance spectroscopy, linear polarization, and scanning electron microscopy. It was observed that the corrosion resistance of samples anodized in gallic-sulfuric acid solution at 10 mA·cm−2 is lower than samples anodized in sulfuric acid. It was also observed that higher anodization current density can lead to lower corrosion resistances for aluminum samples anodized in gallic-sulfuric acid solution. However, samples anodized at 5 mA·cm−2 and at a gallic acid concentration of 5 g·L−1 showed better corrosion performance than the samples anodized in sulfuric acid only. This suggests that the use of low amounts of gallic acid as an additive for sulfuric acid anodization can lead to better corrosion resistances for anodized aluminum.

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