Electricity Generation From Petroleum Contaminated Wetland Sediment Obtained from Ekerekana-Ama Creek in Rivers State

Authors : Olugbo, Friday Amos Ibitayo; Ogugbue, Chimezie Jason; Chikere, Chioma Blaise

Volume/Issue : Volume 5 - 2020, Issue 2 - February

Google Scholar : https://goo.gl/DF9R4u

Scribd : https://bit.ly/2TdV4KN

This research study was designed to generate electrical power through a biolelectrochemical system: microbial fuel cell (MFC) from petroleum contaminated wetland sediment obtained from Ekerekana-Ama Creek, Okrika, in Rivers State. Sediment Microbial Fuel Cells (SMFCs) consisting of an anode embedded in the anaerobic sediment containing petroleum hydrocarbon contaminants and a cathode suspended in the overlying aerobic water were used. Seven 300 ml sterile transparent bottles labelled T1 to T7 subjected to different treatments were used for this electrical power generation study. Digital multimeter was used to measure the voltage and current of electricity generated. It was observed that voltage of electricity generated increased for some weeks and finally fall which is as an indication that organic substrates depletion was caused by electrochemically active bacteria (EAB). Maximum power output generated from T1, T2, T4, T5 and T6 were 0.95 mW, 306.50 mW, 0.18 mW, 126.60 mW and 0.49 mW respectively. Methylene blue (100 μM) aided electron transfer by microbes than neutral red (100 μM) while NPK 15-15-15 did not significantly improve electricity generation as observed in this study Distinct bacteria isolated were characterized biochemically and molecularly. The identity of the bacteria nucleotide sequences ( genus to species) as shown by Basic Local Alignment Search Tool (BLAST) identified Clostridium sporogenes (MF623797), Desulfobulbus propionicus (MF623798), Ewingella Americana (MF623799), Bacillus amyloliquefaciens (MF623800), Helicobacter sp. (MF623801), Alcaligenes faecalis (MF623802), Clostridium botulinum, Bacillus subtilis (MF623803), Klebsiella oxytoca (MF623804), and Burkholderia cepacia (MF623805) associated with T1 to T7. These isolated Bioelectrochemically Active Bacteria (BEA) interplayed metabolically to bring about electrical power generation in this study. Installation of biolectrochemical devices in water associated with Niger Delta, Nigeria where oily activities are predominant will go a long way in remediating such environment and concurrent generation of electricity for sustainable development is attainable.


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