Augmentation of air cathode microbial fuel cell performance using wild type Klebsiella variicola

Islam, M. Amirul; Karim, Ahasanul; Woon, Chee Wai; Ethiraj, Baranitharan; Cheng, Chin Kui; Yousuf, Abu; Khan, Maksudur R.

doi:10.1039/c6ra24835g

Cited by 57 publications

(37 citation statements)

References 32 publications

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“…Global warming associated with carbon dioxide emission from the usage of traditional fossil fuels is a great concern in the present century . Therefore, the demand of sustainable and carbon‐neutral energy is increasing tremendously, since it is less harmful to the environment . Recent studies have been focused on the conversion of bio‐based feedstocks to produce biofuels because of their abundance and availability.…”

Section: Introductionmentioning

confidence: 99%

Microbial lipid extraction from Lipomyces starkeyi using irreversible electroporation

Karim

Yousuf

Islam

et al. 2018

Biotechnology Progress

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The aim of the study was to investigate the feasibility of using irreversible electroporation (EP) as a microbial cell disruption technique to extract intracellular lipid within short time and in an eco-friendly manner. An EP circuit was designed and fabricated to obtain 4 kV with frequency of 100 Hz of square waves. The yeast cells of Lipomyces starkeyi (L. starkeyi) were treated by EP for 2-10 min where the distance between electrodes was maintained at 2, 4, and 6 cm. Colony forming units (CFU) were counted to observe the cell viability under the high voltage electric field. The forces of the pulsing electric field caused significant damage to the cell wall of L. starkeyi and the disruption of microbial cells was visualized by field emission scanning electron microscopic (FESEM) image. After breaking the cell wall, lipid was extracted and measured to assess the efficiency of EP over other techniques. The extent of cell inactivation was up to 95% when the electrodes were placed at the distance of 2 cm, which provided high treatment intensity (36.7 kWh m ). At this condition, maximum lipid (63 mg g ) was extracted when the biomass was treated for 10 min. During the comparison, EP could extract 31.88% lipid while the amount was 11.89% for ultrasonic and 16.8% for Fenton's reagent. The results recommend that the EP is a promising technique for lowering the time and solvent usage for lipid extraction from microbial biomass. © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 34:838-845, 2018.

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Section: Introductionmentioning

confidence: 99%

Microbial lipid extraction from Lipomyces starkeyi using irreversible electroporation

Karim

Yousuf

Islam

et al. 2018

Biotechnology Progress

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“…In order to obtain the characteristics of the charge transfer resistance of different anodes after inoculation, the EIS experiments were performed and an equivalent circuit (inserted in Figure B) was used for the curve fitting. The measurement of EIS spectra of the bio‐anode could provide valuable information of electron transfer resistance of electrode during the cell metabolism process …”

Section: Resultsmentioning

confidence: 99%

“…The measurement of EIS spectra of the bio-anode could provide valuable information of electron transfer resistance of electrode during the cell metabolism process. [36][37][38] As shown in Table 2, the observed value of R ct for different bio-anodes decreased compared with those prepared anodes before inoculation. For example, as for 90-C bioanode-ED, R ct value reduced dramatically to almost 60 Ω and decreased by 99.3% ( Figure S4).…”

Section: Electrochemical Analysis Of Bio-anodesmentioning

confidence: 86%

Electrodeposition of graphene by cyclic voltammetry on nickel electrodes for microbial fuel cells applications

et al. 2019

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Summary Ni electrode was modified with graphene by the electrodeposition (ED) method to prepare an anode (anode‐ED) for microbial fuel cell (MFC). Electrochemical and morphological characterizations of anode‐ED along with the effects of anode modification on the MFC performance were investigated. The graphene modification based on cyclic voltammetric electrodeposition resulted in the decrease of charge transfer resistance (Rct) and improved extracellular electron transfer efficiency of anode. The maximum power density obtained from the MFC equipped with anode‐ED was 25.83 and 17.86 times larger than those of MFCs equipped with bare Ni anode and anode modified with graphene by traditional hydrothermal treatment method (anode‐HT), respectively. The electrochemical impedance spectroscopy (EIS) analysis results indicated that the Rct of anode decreased significantly after inoculation during the MFC operation. The improvement in power density was attributed to the decreasing Rct and the biocompatibility of graphene modified on anode‐ED surface. This study presented an effective electrodeposition method to make graphene‐modified anodes, which could improve the MFC performance.

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“…K. variicola has been reported to have not only lignocellulolytic activities but also the ability to utilize diverse types of carbohydrates (Jiménez et al, 2014;Dantur et al,. 2015;Islam et al, 2017). A. calcoaceticus and other Acinetobacter members can utilize diesel and lignin as carbon sources (Ho et al, 2017;Ghodake et al, 2009;Ponnambalam et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

Microbial degradation of lignocellulosic biomass: discovery of novel natural lignocellulolytic bacteria

Ahmed¹,

Rahman²,

Hasan³

et al. 2018

bta

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Lignocellulosic biomass is the most abundant biomaterial on Earth and holds enormous potential as a source of fermentable sugars for cost-effective biofuel production. The main obstacle is the intractable and convoluted structure and composition of lignocellulosics which are mainly made of lignin, cellulose and hemicellulose. However, nature has equipped microbes with enzymes that can deconstruct lignocellulose and release fermentable sugars. In this study, we selected bacteria (belonging to 6 different genera) from nature that had been grown in minimal culture media with cellulose or lignin as the sole carbon source, and assessed their lignocellulolytic activities in qualitative and quantitative assays. Through sequence analysis of the 16S rRNA gene, we discovered a novel lignocellulolytic bacterial species, Chryseobacterium gleum, capable of degrading both cellulose and lignin. In addition, a few other bacterial species previously known to degrade either cellulose or lignin were found to have lignocellulolytic activities. The majority of these bacterial species were found to produce extracellular lignocellulolytic enzymes. Lignocellulolytic bacteria identified in this study may serve as sources of genes/enzymes which might find applications in biofuel production and other industrial applications.

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Augmentation of air cathode microbial fuel cell performance using wild type Klebsiella variicola

Abstract: Simultaneous power generation and wastewater treatment in the single chamber air cathode microbial fuel cell have been enhanced by introducing wild-type Klebsiella variicola as an efficient inoculum for the anode operated with palm oil mill effluent.

Cited by 57 publications

References 32 publications

Microbial lipid extraction from Lipomyces starkeyi using irreversible electroporation

Microbial lipid extraction from Lipomyces starkeyi using irreversible electroporation

Electrodeposition of graphene by cyclic voltammetry on nickel electrodes for microbial fuel cells applications

Microbial degradation of lignocellulosic biomass: discovery of novel natural lignocellulolytic bacteria

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