Design of gas concentration measurement and monitoring system for biogas power plant

Biogas is a gas obtained from the breakdown of organic matter (such as animal waste, human and plants) by methanogenic bacteria in an oxygen-free (anaerobic) state. The biogas produced mainly consists 50-70% methane, 30-40% carbon dioxide, other gases small amounts. has different composition depending on type that produces it. It challenging to obtain concentration data because monitoring equipment currently minimal. Therefore, this research discusses how make system for reactors. Sensors are installed digester tank storage tank. sensors MQ-4 sensor detect methane (CH<sub>4</sub>), MG-811 dioxide (CO<sub>2</sub>) gas, MQ-136 sulfide acid (H<sub>2</sub>S), Thermocouple Type-K temperature. will send signal control unit Arduino Mega 2560, then processed displayed liquid crystal display (LCD). calculation results' accuracy not much reference based readings. deviation standard below 5.0, indicating precision. sensor's linearity 0.7%, 0.17%, 0.29%, 1.19%. can be used monitor temperature reactor.