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Journal : Reaktor

Energy Harvesting from Sugarcane Bagasse Juice using Yeast Microbial Fuel Cell Technology Marcelinus Christwardana; Linda Aliffia Yoshi; J. Joelianingsih
Reaktor Volume 21 No. 2 June 2021
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (636.167 KB) | DOI: 10.14710/reaktor.21.2.52-58

Abstract

This study demonstrates the feasibility of producing bioelectricity utilizing yeast microbial fuel cell (MFC) technology with sugarcane bagasse juice as a substrate. Yeast Saccharomyces cerevisiae was employed as a bio-catalyst in the production of electrical energy. Sugarcane bagasse juice can be used as a substrate in MFC yeast because of its relatively high sugar content. When yeast was used as a biocatalyst, and Yeast Extract, Peptone, D-Glucose (YPD) Medium was used as a substrate in the MFC in the acclimatization process, current density increased over time to reach 171.43 mA/m2 in closed circuit voltage (CCV), maximum power density (MPD) reached 13.38 mW/m2 after 21 days of the acclimatization process. When using sugarcane bagasse juice as a substrate, MPD reached 6.44 mW/m2 with a sugar concentration of about 5230 ppm. Whereas the sensitivity, maximum current density (Jmax), and apparent Michaelis-Menten constant (????????????????????) from the Michaelis-Menten plot were 0.01474 mA/(m2.ppm), 263.76 mA/m2, and 13594 ppm, respectively. These results indicate that bioelectricity can be produced from sugarcane bagasse juice by Saccharomyces cerevisiae.Keywords: biomass valorization, biofuel cell, acclimatization, maximum power density, Michaelis-Menten constant
Non-Catalytic Biodiesel Synthesis from Kemiri Sunan (Reutealis trisperma) in Semi-Batch Bubble Column Reactor J. Joelianingsih; Faisal Ramadhan Nur; Melani Eka Saputri; Is Sulistyati Purwaningsih
Reaktor Volume 21 No. 3 September 2021
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (275.367 KB) | DOI: 10.14710/reaktor.21.3.95-102

Abstract

The Bubble Column Reactor (BCR) is intensive equipment used as a multiphase contactor and reactor in the chemical, biochemical, and petrochemical industries. BCR has some advantages include high mass and heat transfer rates, compactness, and low operating and maintenance costs. In this research, BCR was applied to produce biodiesel from Kemiri Sunan (Reutealis trisperma) Oil through non-catalytic and simultaneous esterification and transesterification reactions. Kemiri Sunan Oil was fed in the reactor and heated to a specific temperature. During the heating process, nitrogen gas was flowed to prevent oxidation. Liquid methanol flowed at some various flow rates through a vaporizer and superheater so that it has flowed into the reactor in the form of saturated steam (1 atm, 240 ºC). Experiments with variations in the methanol flow rate were carried out at a reaction temperature of 250 ºC, while experiments with various temperatures were carried out at a methanol flow rate of 2.5 mL/min. The best conditions were obtained at a flow rate of 2.5 mL min with a reaction temperature of 290 ºC. The production rate was 3.47 g/min with an acid number of 0.69 mg KOH/gr sample, and FAME content was 78.2% wt. These results indicate the simultaneous esterification and transesterification reaction in one reactor.
The Influence of Various Substrates on Power Generation in The Operation of Yeast Microbial Fuel Cells Christwardana, Marcelinus; Joelianingsih, J.; Yoshi, Linda Aliffia
Reaktor Volume 22 No.2 August 2022
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.22.2.36-41

Abstract

Several carbon substrates were tried, including glucose commercial, pro analysis glucose, commercial sugar, and yeast extract - peptone - d glucose (YPD) medium to improve the efficiency of the single chamber microbial fuel cell (MFC). The power production of various electron donors was investigated using baker yeast Saccharomyces cerevisiae. Voltage and power density generation were used to establish the pattern of substrate use. In addition, electrochemical analysis of the anodic biofilm was performed. S. cervisiae was shown to successfully consume YPD medium by anode respiration with a higher power density of 18.40±1.98 mW/m2, followed by pro analysis glucose (9.41±1.15 mW/m2), commercial glucose (1.30±0.10 mW/m2), and commercial sugar (0.04±0.01 mW/m2). Furthermore, a clear relationship was established between power density generating rate and voltage output. Voltages produced were 0.16±0.02 V, 0.13±0.03 V, 0.03±0.01 V, 0.01±0.00 V for YPD medium, pro analysis glucose, commercial glucose, and commercial sugar, respectively in MFC. The weight of biofilm indicated that yeast attachment was significantly more common in YPD medium than in other MFC-operated media. This study discovered that the substrate type in the anodic compartment regulates the formation of anodic biofilm.