Selection of the best barrier solutions for liquid displacement gas collecting metre to prevent gas solubility in microbial electrolysis cells
by Abudukeremu Kadier; K. Chandrasekhar; Mohd Sahaid Kalil
International Journal of Renewable Energy Technology (IJRET), Vol. 8, No. 2, 2017

Abstract: Microbial electrolysis cells (MECs) are a novel technology aiming at producing hydrogen from biomass or wastewater. The collection and preservation of the gas generated in the MECs is the first and most important operation in gas measuring techniques. There are several techniques for the quantitative evaluation of gas production in MECs, such as Owen method, respirometre, and gas bag methods. However, the costs associated with these methods could make MEC technology scale-up expensive and impractical. This work describes evaluation of commonly used biogas measurement techniques and analyses potential errors associated with liquid displacement gas measurement. Inaccuracy mainly due to CO₂, and CH₄ dilution in displaceable liquids was evaluated by testing solubility of CO₂ in 12 different barrier solutions. 95% saturated NaCl (pH 0.5) solution exhibited lower CO₂ solubility among the tested solutions. These results indicate that gas production in MECs can be accurately tested using an inexpensive, simple gas metre.

Online publication date: Thu, 28-Sep-2017

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