Monitoring of anaerobic waste digestion at Quito slaughterhouse
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Abstract
Organic matter from slaughterhouses can be used through anaerobic digestion to produce biogas and a nutrient-rich fertilizer. Monitoring the concentration of methane, propane, and butane are relevant parameters that show the efficiency of digestion. In the present study, a methodology for the measurement of these hydrocarbons was developed, using Fourier transform infrared spectrophotometry (FTIR) and the assistance of chemical-quantum calculations, which allowed the assignment of absorption bands of each hydrocarbon in biogas. The quantification limits were 0.36 %V/V for propane and butane and 1.47 %V/V for methane. Digestion tests were carried out with waste from the municipal slaughter center of the Metropolitan District of Quito, obtaining that a mixture of rumen and bovine manure, subjected to 50 °C, generated enriched biogas up to 65.4 %V/V after 15 days of digestion. Additionally, solid and liquid digestate produced met with international regulations for possible application in the soil. The results demonstrate the potential of the digestion monitoring method and the possible transformation of litter waste into a renewable energy source.
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