Construcción de un sistema de bajo costo para el uso y evaluación de sensores semiconductores para gases

Delgado-Castro, Alejandro; Rojas-Bolaños, Omar

doi:10.1016/j.eq.2015.07.001

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Draeger 6811960 and GEM2000/5000 infrared sensors (Land-Tec) were used but these sensors are expensive, and require a very large sample volume compared to MQ-4 sensors. Delgado and Rojas [9] designed a low-cost system using a MQ-4 sensor within an exposure chamber and a methane generator. The calibration of the MQ-4 sensor was made from 0 to 120 ppm, showing that the methane sensor is very sensitive in this range [10].…”

Section: Introductionmentioning

confidence: 99%

Design of a Methane Monitoring System for Landfill and Duct Emissions

Hahn¹,

Grande²

2020

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Methane is released from waste disposal areas as a result from anaerobic decay of food. Methane causes more greenhouse effects than carbon dioxide so a methane monitoring system is required to warn its release from gas emitting environments. The low explosive limit of methane is 5% in ambient air, so gas leakage is dangerous and can produce explosions. An entire head monitoring system was built around a MQ-4 methane gas sensor as it is cheap and reliable. The design proves to be flexible enough as it can measure CH 4 emissions in ducts, CH 4 in landfills at different depths and even in cattle barns. The measuring system head consists of a suction pump, solenoids, and a methane sensor. Measurements are taken 13 seconds after methane gas sucking. A timing of 100 seconds is required for purging the chamber before the second solenoid is turned-on. Devices temperature during operation was sampled with a thermal Flir-One camera and solenoid coil temperature was of 24.9˚C after a continuous operation of 30 seconds. As hoses for emission sampling become larger time for sampling increases as well as energy consumption.

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Section: Introductionmentioning

confidence: 99%

Design of a Methane Monitoring System for Landfill and Duct Emissions

Hahn¹,

Grande²

2020

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Biohydrogen from activated sludge from textile wastewater treated with low doses of gamma radiation

Recalde

Aguay

Pérez

et al. 2018

Radiation Physics and Chemistry

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Estimating Methane Emission Rate from an Oxidation Lagoon Using Low-Cost Sensor

Heyer-Rodriguez,

Guevara-Garcia,

Ventura-Holule

2023

Preprint

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In Mexico, the second source of methane emissions is anaerobic digestion of waste, then is necessary the development of methane emission measurement methodologies to evaluate the mitigation measures adopted. This work describes a methodology for the estimation of methane emission rate from an oxidation lagoon using the static flow chamber technique and a low-cost methane sensor MQ-4. The study area was the oxidation lagoon “Bordo Los Puerquitos”, which receive wastewater from Cd. Victoria, Tamaulipas, México. Six sampling points were selected at the oxidation lagoon, and the methane concentration inside the static flow chamber was recorded over a 10-minute period. A linear regression analysis was realized to obtain the slop, which is equivalent to the methane emission rate. A slope comparation using a t-test after check of homoscedasticity of samples were performed. Spatial analysis using kriging interpolation was used to obtain the distribution of the methane emission rate at the lagoon and Voronoi polygons were used to determinate the influence area of each sampling point to obtain the weighted average emission of methane. The spatial analysis showed a south to north gradient of the CH4 emission rate with an average of 6.6 ± 3.3 ppm CH4 /min, the estimated emission of methane was 821.69 kg CH4/day. The results of this study are like those reported for a freshwater body with a slightly contaminated mesotrophic condition. The use of the static flow chamber with MQ-4 sensor for methane is a fast and low-cost methodology that can be used to estimate the contribution of GHGs from oxidation lagoons.

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Construcción de un sistema de bajo costo para el uso y evaluación de sensores semiconductores para gases

Cited by 3 publications

References 5 publications

Design of a Methane Monitoring System for Landfill and Duct Emissions

Design of a Methane Monitoring System for Landfill and Duct Emissions

Biohydrogen from activated sludge from textile wastewater treated with low doses of gamma radiation

Estimating Methane Emission Rate from an Oxidation Lagoon Using Low-Cost Sensor

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