Technical Design of a Low-Cost, Portable Methane Quantification System

Context: Based on an analysis of the development of biodigester technology, a recurring problem with the rigorous quantification of methane was observed. A bibliographical review evidenced systems that are inefficient or have high costs. This work proposes an accessible and effective system that seeks to contribute to related academic and research projects. Method: Methane quantification is performed via an MQ-4 series sensor coupled with a capsule, creating a partially closed medium in which a dilution of sample gases and ambient air is injected by using a syringe, thus extending the measurement range of the sensor. Results: A calibration curve was elaborated, extending the measurement range from 0,02-1% concentration to 10-80 %v/v, with a variance of +/- 5 %. Conclusions: An efficient and accessible prototype for methane quantification for academic and research purposes was developed. A guide for replicating the process is added as a complement. Acknowledgments: The authors would like to thank Universidad de America and Universidad Nacional de Colombia for participating in this project.