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IJCRR - 11(17), September, 2019

Pages: 18-25

Date of Publication: 09-Sep-2019


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Effect of Methylene Blue Addition as a Redox Mediator on Performance of Microbial Fuel Cell Using Mud Sediment of River Ala

Author: Olotu T. M, ; Adegunloye D. V., Ekundayo F. O.

Category: Life Sciences

Abstract:Microbial fuel cells (MFCs) are also bioreactors that convert chemical energy stored in the bonds of organic matters into electricity through biocatalysis of microorganisms. Mud sediment of various depths (surface water, mud surface, 50cm, 100cm and 150cm) of River Ala were used in a double chamber microbial fuel cell (MFC) to generate electric current and comparative studies of the methylene blue mediator and mediator-less chamber were carried out. Microbial analyses, physiochemical analysis of the sediment were analyzed using standard methods. River Ala surface has the highest bacteria count of 2.4 x 10-5 and AL100cm has the lowest of 0.48 x 10-5 while AL100cm had the lowest fungi count of 0.2 x 10-6. The pH of sediment ranged from 7.52 to 6.52 and organic matter content 3.67 to 1.83(%). The mud surface has the highest conductivity and salinity content of 740 (\?S) and 359 (ppm) respectively. The current and voltage readings obtained from of the methylene blue mediator chamber were slightly higher than that of the mediator-less chamber. Current 0.5 (mA) at only depth 50cm was observed in mediator-less chamber while 0.4 (mA) were common occurrences at depth 50cm and depth 100cm at the methylene blue mediator chamber; voltage readings of 0.3(V) only occurred depth 50cm in the mediator-less chamber while 0.3 (V) were observed at both depth 50cm and 100cm at the methylene blue mediator chamber. The low current and voltage reading were as a result of the high resistance it's generated and its low organic matter content. It is also a confirmation that the mediator used has an impact in the current and voltage generated in microbial fuel cell.

Keywords: Sediment, Microorganisms, Electric current, Methylene blue and Microbial fuel cell

Full Text:

Introduction

Electricity is an essential element in our daily life, something we cannot live without literally, we would die without it. From the simplest form of living organism to the complicated human body, electrical force governs every single physiological process. Bio-electricity is vital in storing metabolic energy and providing signals to other cells which influence growth, regeneration and communication (Levin and Stevenson, 2012). In 2005, 66% of that electricity was generated from coal, petroleum and natural gas and was responsible for 10.9 Gt (41%) of world energy- related CO2 emission (Brandt, et al., 2007). Depending on the region, your electricity could come from the dirtiest coal burning plant, a high risk nuclear facility, or a hydro electrical dam, which, although pollution free, still deteriorates the local geological and ecological systems. The human-induced greenhouse effect as a result of fossil fuel reliance has become an increasingly controversial issue in many countries since the 1960s. The fast depletion of fossil fuel due to intensive extraction and usage is widely believed to be associated with the atmospheric CO2 concentration increase from 275 ppm to 397 ppm in the last two centuries. As a result, development of sustainable energy technologies which can continue providing society with energy-derived benefits without further environmental destructions is highly desirable. A series of green energy solutions, such as solar, wind and biomass energy, have been introduced in the hope of preventing the impending global environmental crisis (Brandt, et al., 2007). Microbial fuel cell (MFC) is a bio-electrochemical cell which utilizes electrogenic bacteria to oxidize a variety of substrates including acetate, glucose, volatile fatty acids and inorganic substances such as sulfides and nitrite, to form electrical current(Faraghi and Ebharimi, 2012; Rabaey, et al., 2006). Through the oxidation process electrons and protons are generated at anode and recombined at the cathode to produce water (Logan et al., 2006) MFC consists of two compartments: an anaerobic anode and aerated cathode compartments which are separated by a proton exchange membrane or salt bridge (Sharma et al., 2010; Higgins et al., 2013). Microbial fuel cells (MFCs) are also bioreactors that convert chemical energy stored in the bonds of organic matters into electricity through biocatalysis of microorganisms (Davis and Yarbrough, 1962; Moon et al., 2006). A typical MFC chamber has the anodic and cathodic chamber and is separated by a proton exchange membrane (PEM) (Wilkinson, 2000; Gil et al., 2013) which allows transport protons while blocking oxygen and other compounds. Microbes in the anodic chamber degrade organic matters and produce electrons, protons and carbon dioxide. Electrons and protons produced by microbes are then transported to the cathodic chamber via external circuit and a proton exchange membrane (PEM), respectively. In the cathodic chamber, protons and electrons react with oxygen to form water. Because the terminal electron acceptor (i.e., oxygen) is kept away from the anodic chamber, electrons are allowed to pass through the external load to generate electricity (Park, et al., 2000; Du et al., 2007). A variety of bacteria can produce a modicum of electricity in an MFC if a mediator is used to facilitate the transfer of electrons between the bacterial cells and the anodic surface used in the system, while many other bacteria have been found to possess the ability to transfer electrons from fuel (substrate) oxidation to a working electrode without a mediator (Logan, 2009). Direct electron transfer from anaerobic anode chamber to its surface had shown to take place at low efficiency. Electron transfer efficiencies in MFCs can be improved using a suitable electron mediator. Most biological fuel cells use electron mediator component to improve the power output of the cell. It has been reported that mediators are artificially added to anode chamber, such as MB, neutral red (NR), thionin, ferricyanide, humic acid or methyl viologen. The presence of artificial electron mediators is essential to improve the performance of MFCs (Park and Zeikus, 2000). This experiment is to determine microbial population and identification of microorganisms in various depths of the mud sediment of River Ala, to compare the methylene blue mediator microbial fuel cell chamber with the mediator-less chamber in current and voltage generation. It will also determine of the pH, organic carbon, conductivity, ionization potential and salinity of the mud sediments in relation to current generation.

2. Materials and Methods

Collection of sample used in the Microbial fuel chamber

1kg mud sediment sample were collected at the various depths of the mud surface, depth 50cm, depth 100cm, depth 150cm and the surface water. Samples were collected aseptically in clean containers and transported to Microbiology laboratory of Federal University of Technology, Akure.

Microbiological and physiochemical analyses of the mud sediment samples

Microbial population and identification was determined for each samples (mud surface water, mud surface, depth 50cm, depth 100cm and depth 150cm) and for the control (which was soil sample of area close to the river). The microorganisms which were mainly bacteria, fungi and yeast were isolated using nutrient agar, centrimede agar, mannitol salt agar, salmonella- shigella agar, marconkey agar, eosin methyl blue and potato dextrose agar. The physiochemical parameters determined were pH using a Jenway’s pH meter, Conductivity using digital Conductivity Mettler Toledo M400 measuring meter and Salinity using electrical conductivity using a conductivity bridge .Organic matter of the soil was done according to the method of (Skotnikov, 1998) and mineral matter was determined using atomic Absorption Spectrophotometer according to (Bhargava and Raghupathi, 1993).

Construction for the various mud sediment depths

1.5 liter size transparent plastic bottles made up the cathode and anode chamber, hole of 2cm in diameter were bored at each side of the bottles. Polyvinyl chloride (PVC) pipe of dimensions 5 cm length and 2 cm diameter made up the agar salt bridge. Each container was surface sterilized with 70% ethanol before introduction of its content. The salt bridges to be used was prepared prior to collection of the mud sample and kept from contamination before use. Each salt bridge was then attached to the each anode and cathode bottle using an epoxyl gum as according to (Parkash, 2016).

Composition of anodic and cathode chamber

 Mud sediment of 1litre size of the various samples (mud surface water, mud surface, depth 50cm, depth 100cm and depth 150cm) was introduced into the mediator and mediator-less anode chamber and the cathode chambers was filled 1L of NaCl solution which was made up 7.5g of Nacl in 100ml of water (Parkash, 2016).

Composition of salt bridge

The salt bridge solution was prepared according to the methods of (Parkash, 2016) by dissolving 3% agar in 1M NaCl. The solution was first subjected to heat for blending, which in return gave a clear solution of agar solution and was poured into each PVC pipe which was properly sealed with foil paper and was kept at 250C for 2hrs for solidification

Addition of methylene blue as mediator

30mls of mehylene blue was added to the each anode mediator chamber where 10mls was added daily for 72hrs as according to (Zuhri et al., 2016).

Measurement and collection of data calculation

Readings obtained for current, voltage and resistance was obtained using a

Result and Discussion

Figures 1-3 shows the bacteria, fungi and yeast population isolated from mud sediment of River Ala at various depths. Microorganisms were isolated at varies depth including control, surface water, mud surface, 50cm, 100cm and 150cm depth. Generally, microbial population of the various depths decreases as the depth increases. ALS has the highest bacteria count of 2.4 x 10-5 and AL100cm has the lowest of 0.48 x 10-5 while AL100cm had the lowest fungi count of 0.2 x 10-6 and ALC (Control) had the highest of 1.6 x 10-5. Also there were no growth observed at depth 150cm for fungi count and in yeast count at depth ALC, AL50, AL100 and AL150. Table1 shows the arrays of bacteria, fungi and yeast isolated from the various depths of surface water to depth 150cm

Figure 4 shows the Conductivity, Ionization potential, Organic matter content and Salinity content of River Ala at various depth of surface water, depth 50cm, depth 100cm and 150cm. The pH values of all mud were observed to be slightly acidic to neutral. Ala surface water (W), surface mud (0cm), 50cm, 100cm and 150cm depth records 7.52, 5.59, 5.50, 5.47 and 6.52 respectively. Organic matter content of mud at various depth were quite low, surface water (W), surface mud (0cm), 50cm, 100cm and 150cm depth recorded 2.12, 1.83, 3.69, 2.09 and 3.67 (%) respectively. For the ionization potentials depth 0cm has the highest ionization potential of 52Mev, surface water (W), surface mud (0cm), 50cm, 100cm and 150cm depth recorded 29, 52, 47, 24 and 32 (Mev) respectively. In the Conductivity readings, it was observed that depth 0cm has the highest conductivity and depth 100cm had the lowest. Surface water (W), surface mud (0cm), 50cm, 100cm and 150cm depth recorded 740,172, 119, 209 and 56 (µS) respectively. Salinity content of the various depths shows that surface water has the highest salinity content while depth 150cm had the lowest. Surface water (W), surface mud (0cm), 50cm, 100cm and 150cm depth recorded 359, 114, 189, 107 and 32 (ppm) respectively.

Tables 1 to 6 are showing the readings of current, voltage and resistance obtained  from the mediator-less chamber and the mediator chamber across the various mud sediment depths. The current readings generally increase in the first four days of the experiment and decreases as the numbers of days of the experiment increases. Current readings for the mediator microbial fuel chambers were generally slightly higher than the mediator-less chamber. The mediator-less chambers readings ranged from 0.484 to 0.019 (mA) and mediator chambers readings ranged from 0.369 to 0.012 (mA) for surface water to depth 150cm. Plates 1 and 2 are showing the pictures of the microbial fuel cell chambers during the experiment.

KEYS:

AW-Ala surface water, AS- Ala mud surface, A50- Ala depth 50cm, A100- Ala depth 100cm and A150- Ala depth 150cm; AWM-Ala surface water with methylene blue, ASM- Ala mud surface with methylene blue, A50M- Ala depth 50cm with methylene blue, A100- Ala depth 100cm with methylene blue and A150- Ala depth 150cm with methylene blue.

Values followed by the same letters (s) on the same column are not significantly different (P≤ 0.05). Each value represents a mean of four reading

Microorganisms are used in MFC to convert organic and inorganic compounds into bioelectricity (Manohar and Mansfeld, 2009). Mud sediments from River Ala was use to generate electric current using microbial fuel cell, the sediment was oxidize by bacteria under anaerobic condition in the anode chamber generating protons and electrons. Microbial population of the various depths decreases as the depth increases (Figure 1 and 2). The decrease in the aerobic bacteria population down the depth might be due to oxygen retention is lower at the lower depths which only permit the growth of only anaerobic organisms. Fungal growth was not observed at the observed at the lower depths of the various river sediments, these findings agrees with findings of (Reddy et al., 2000) who reported that aerobic microbial populations are restricted to zones where oxygen is available and that aerobic organisms become quiescent or die and new inhabitants, largely facultative and obligate anaerobic bacteria take over. (Fischer et al., 2002) concluded that Bacterial abundance generally decreases with sediment depth independent of the method used. Majorities of these microorganisms are faecal contaminates which might have accounted for the findings of (Jamieson et al., 2004) that bacteria often show an affinity for sediment attachment as sediments represent a beneficial environment for nutrient, food assimilation and protection from environmental stress such as contaminants and predation. pH of the mud sediments at various depths  were slightly acidic to neutral pH. Sediment is also the major site for organic matter decomposition which is largely carried out by bacteria. pH is extremely important, since most of the chemical reactions in aquatic environment are controlled by any change in its value. Anything either highly acidic or alkaline would kill aquatic life. Aquatic organisms are sensitive to pH changes and biological treatment requires pH control (Abowei and Sikoki, 2005). High conductivity and salinity observed at the surface water than other depth might be that more ions that are present at the depth that led to its high conductivity and salinity is a good contributor to salinity. The higher current and voltage generation observed at the early stage of the experiment might be as a result the microorganisms could still get enough organic matter to metabolize in the anaerobic digestion to produce proton and electrons at the anode which at the later weeks the nutrient depleted and causes its reduction as according to the findings of (Pavan et al., 2015) who analyses energy harvested from Kitchen Waste through Two-chamber Microbial Fuel Cell. (Parkash, 2016) in his findings on characterization of voltage and current generated from cow dung using double chambered MFC observed that was a definitive increase in the generated current and voltage from day 1 to day 5 and then a decline in trend is observed from the day 6 downward. The resistance generated by the microbial fuel chamber that was very high might have contributed to the low current and voltage observed which aggress with (Menicucci et al., 2006) who revealed that cell voltage of MFC decreases when external resistance increases. (Samrot, et al., 2010) also input that MFCs with lower external resistances resulted in higher anode potentials. Methylene blue mediated MFC current and voltage generated was higher in general observation than mediator-less which is because they are aided by the addition of the methylene which busts their current generation potential which is in accordance with the findings of (Rahim Nejad et al., 2011) on methylene blue as electron promoters in microbial fuel cell. Most microbes are electrochemically inactive because the proteins associated with electron transport are contained within the cell membrane. Mediators can be used to facilitate the transfer of electrons from the microbial membrane to the MFC electrode for these microbes (Kim, et al., 2005). Mediators are preferentially reduced during the metabolic oxidation of organic materials, and the reduced form of the mediator is then re-oxidized at the working electrode (anode), which is maintained at a sufficiently high electric potential. Nearly any bacterium can be used to generate current in a mediated MFC.

Conclusion

Mud sediment for the use of generating electricity has proven to be one of the promising technologies through the use of microbial fuel cell and the use of mediator which help to facilitate non electrogenic bacteria to generate electric current; MFC had also proven to be a good cheap alternative to the use of fossil fuel for power generation.

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A Study by Purushottam S. G. et al. entitled "Development of Fenofibrate Solid Dispersions for the Plausible Aqueous Solubility Augmentation of this BCS Class-II Drug" is awarded Best article for Vol 13 issue 10
A Study by Kumar S. et al. entitled "A Study on Clinical Spectrum, Laboratory Profile, Complications and Outcome of Pediatric Scrub Typhus Patients Admitted to an Intensive Care Unit from a Tertiary Care Hospital from Eastern India" is awarded Best Article for Vol 13 issue 09
A Study by Mardhiah Kamaruddin et al. entitled "The Pattern of Creatinine Clearance in Gestational and Chronic Hypertension Women from the Third Trimester to 12 Weeks Postpartum" is awarded Best Article for Vol 13 issue 08
A Study by Sarmila G. B. et al. entitled "Study to Compare the Efficacy of Orally Administered Melatonin and Clonidine for Attenuation of Hemodynamic Response During Laryngoscopy and Endotracheal Intubation in Gastrointestinal Surgeries" is awarded Best Article for Vol 13 issue 07
A Study by M. Muthu Uma Maheswari et al. entitled "A Study on C-reactive Protein and Liver Function Tests in Laboratory RT-PCR Positive Covid-19 Patients in a Tertiary Care Centre – A Retrospective Study" is awarded Best Article of Vol 13 issue 06 Special issue Modern approaches for diagnosis of COVID-19 and current status of awareness
A Study by Gainneos PD et al. entitled "A Comparative Evaluation of the Levels of Salivary IgA in HIV Affected Children and the Children of the General Population within the Age Group of 9 – 12 Years – A Cross-Sectional Study" is awarded Best Article of Vol 13 issue 05 Special issue on Recent Advances in Dentistry for better Oral Health
A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" is awarded Best Article of Vol 13 issue 06
A Study by Chen YY and Ghazali SRB entitled "Lifetime Trauma, posttraumatic stress disorder Symptoms and Early Adolescence Risk Factors for Poor Physical Health Outcome Among Malaysian Adolescents" is awarded Best Article of Vol 13 issue 04 Special issue on Current Updates in Plant Biology to Medicine to Healthcare Awareness in Malaysia
A Study by Kumari PM et al. entitled "Study to Evaluate the Adverse Drug Reactions in a Tertiary Care Teaching Hospital in Tamilnadu - A Cross-Sectional Study" is awarded Best Article for Vol 13 issue 05
A Study by Anu et al. entitled "Effectiveness of Cytological Scoring Systems for Evaluation of Breast Lesion Cytology with its Histopathological Correlation" is awarded Best Article of Vol 13 issue 04
A Study by Sharipov R. Kh. et al. entitled "Interaction of Correction of Lipid Peroxidation Disorders with Oxibral" is awarded Best Article of Vol 13 issue 03
A Study by Tarek Elwakil et al. entitled "Led Light Photobiomodulation Effect on Wound Healing Combined with Phenytoin in Mice Model" is awarded Best Article of Vol 13 issue 02
A Study by Mohita Ray et al. entitled "Accuracy of Intra-Operative Frozen Section Consultation of Gastrointestinal Biopsy Samples in Correlation with the Final Histopathological Diagnosis" is awarded Best Article for Vol 13 issue 01
A Study by Badritdinova MN et al. entitled "Peculiarities of a Pain in Patients with Ischemic Heart Disease in the Presence of Individual Combines of the Metabolic Syndrome" is awarded Best Article for Vol 12 issue 24
A Study by Sindhu Priya E S et al. entitled "Neuroprotective activity of Pyrazolone Derivatives Against Paraquat-induced Oxidative Stress and Locomotor Impairment in Drosophila melanogaster" is awarded Best Article for Vol 12 issue 23
A Study by Habiba Suhail et al. entitled "Effect of Majoon Murmakki in Dysmenorrhoea (Usre Tams): A Standard Controlled Clinical Study" is awarded Best Article for Vol 12 issue 22
A Study by Ghaffar UB et al. entitled "Correlation between Height and Foot Length in Saudi Population in Majmaah, Saudi Arabia" is awarded Best Article for Vol 12 issue 21
A Study by Siti Sarah Binti Maidin entitled "Sleep Well: Mobile Application to Address Sleeping Problems" is awarded Best Article for Vol 12 issue 20
A Study by Avijit Singh"Comparison of Post Operative Clinical Outcomes Between “Made in India” TTK Chitra Mechanical Heart Valve Versus St Jude Mechanical Heart Valve in Valve Replacement Surgery" is awarded Best Article for Vol 12 issue 19
A Study by Sonali Banerjee and Mary Mathews N. entitled "Exploring Quality of Life and Perceived Experiences Among Couples Undergoing Fertility Treatment in Western India: A Mixed Methodology" is awarded Best Article for Vol 12 issue 18
A Study by Jabbar Desai et al. entitled "Prevalence of Obstructive Airway Disease in Patients with Ischemic Heart Disease and Hypertension" is awarded Best Article for Vol 12 issue 17
A Study by Juna Byun et al. entitled "Study on Difference in Coronavirus-19 Related Anxiety between Face-to-face and Non-face-to-face Classes among University Students in South Korea" is awarded Best Article for Vol 12 issue 16
A Study by Sudha Ramachandra & Vinay Chavan entitled "Enhanced-Hybrid-Age Layered Population Structure (E-Hybrid-ALPS): A Genetic Algorithm with Adaptive Crossover for Molecular Docking Studies of Drug Discovery Process" is awarded Best article for Vol 12 issue 15
A Study by Varsha M. Shindhe et al. entitled "A Study on Effect of Smokeless Tobacco on Pulmonary Function Tests in Class IV Workers of USM-KLE (Universiti Sains Malaysia-Karnataka Lingayat Education Society) International Medical Programme, Belagavi" is awarded Best article of Vol 12 issue 14, July 2020
A study by Amruta Choudhary et al. entitled "Family Planning Knowledge, Attitude and Practice Among Women of Reproductive Age from Rural Area of Central India" is awarded Best Article for special issue "Modern Therapeutics Applications"
A study by Raunak Das entitled "Study of Cardiovascular Dysfunctions in Interstitial Lung Diseas epatients by Correlating the Levels of Serum NT PRO BNP and Microalbuminuria (Biomarkers of Cardiovascular Dysfunction) with Echocardiographic, Bronchoscopic and HighResolution Computed Tomography Findings of These ILD Patients" is awarded Best Article of Vol 12 issue 13 
A Study by Kannamani Ramasamy et al. entitled "COVID-19 Situation at Chennai City – Forecasting for the Better Pandemic Management" is awarded best article for  Vol 12 issue 12
A Study by Muhammet Lutfi SELCUK and Fatma entitled "Distinction of Gray and White Matter for Some Histological Staining Methods in New Zealand Rabbit's Brain" is awarded best article for  Vol 12 issue 11
A Study by Anamul Haq et al. entitled "Etiology of Abnormal Uterine Bleeding in Adolescents – Emphasis Upon Polycystic Ovarian Syndrome" is awarded best article for  Vol 12 issue 10
A Study by entitled "Estimation of Reference Interval of Serum Progesterone During Three Trimesters of Normal Pregnancy in a Tertiary Care Hospital of Kolkata" is awarded best article for  Vol 12 issue 09
A Study by Ilona Gracie De Souza & Pavan Kumar G. entitled "Effect of Releasing Myofascial Chain in Patients with Patellofemoral Pain Syndrome - A Randomized Clinical Trial" is awarded best article for  Vol 12 issue 08
A Study by Virendra Atam et. al. entitled "Clinical Profile and Short - Term Mortality Predictors in Acute Stroke with Emphasis on Stress Hyperglycemia and THRIVE Score : An Observational Study" is awarded best article for  Vol 12 issue 07
A Study by K. Krupashree et. al. entitled "Protective Effects of Picrorhizakurroa Against Fumonisin B1 Induced Hepatotoxicity in Mice" is awarded best article for issue Vol 10 issue 20
A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award


A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award


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International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal

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