Madrigal Perez, Glen Bryan

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Madrigal Perez, Glen Bryan
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  • Publicacion
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    Limitations of biochemical methane potential testing in forecasting farm-scale digester performance under psychrotrophic conditions
    (Taylor and Francis Ltd., 2026-01-15)
    Madrigal Perez, Glen Bryan  
    ;
    Quispe Baca, Liz Danitza  
    ;
    Mango Mamani, Diyane Blanca  
    ;
    Jaimes-Estévez, J.
    ;
    Mendieta-Menjura, Oscar
    This study evaluated the extent to which laboratory-scale biochemical methane potential (BMP) assays predict actual methane production in a full-scale tubular anaerobic digester operating under psychrotrophic conditions. The 8 m³ farm-scale digester, situated in a cold, high-altitude climate, was retrofitted with passive solar heating, resulting in an average sludge temperature of 21.5 ± 1.2°C. In contrast, the mean ambient temperature was kept at 10.6 ± 1.4°C. BMP tests were conducted using the digester influent and effluent as substrate and inoculum, respectively, at mesophilic (35 ± 2°C) and psychrotrophic (23 ± 2°C) temperatures. The methane yield in the full-scale system (0.36 Nm³ CH₄ kg-¹ VS), operated at an average temperature of 21.5°C, significantly exceeded the values obtained in the batch BMP tests (0.19 Nm³ CH₄ kg-¹ VS at 35°C and 0.18 Nm³ CH₄ kg-¹ VS at 23°C). No statistically significant correlation was found between laboratory and field data. These findings show the limited predictive power of BMP testing for farm-scale digester performance in decentralized, low-temperature environments.
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    Sugarcane scum as a novel substrate for rapid biogas production from the non-centrifugal cane sugar agribusiness sector in developing countries
    (2019-11-04)
    Mendieta, O.
    ;
    Madrigal Perez, Glen Bryan  
    ;
    Castro, L.
    ;
    Rodríguez, J.
    ;
    Escalante, H.
    Sugarcane scum (SCS) is a waste from the non-centrifugal cane sugar making process. Due to its physicochemical characteristics, it has a high-energy potential to produce biomethane via anaerobic digestion (AD). However, (i) the total solids concentration in the SCS exceeds the limit for wet digestion and (ii) the SCS has a low pH. The aim of this research was to evaluate the utilization capacity of the SCS for methane production through a biochemical methane potential test and extent of disintegration, using dilution pretreatment. The highest methane yield, 0.227 N m3 CH4 kg-1 VS, was achieved at a 12.5% SCS dilution, with an organic matter removal greater than 70% and an extent of disintegration of 34.5%. This is evidence that the AD process is a feasible alternative for SCS treatment.
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