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Anaerobic digestion reduces landfill waste, offers a renewable alternative to fossil fuels, and supports environmental sustainability. Organic waste, especially from the food industry, can produce methane-rich biogas, replacing natural gas. Many industries can adopt this technology to reduce waste, treat effluents, and cut energy costs. The present study evaluated the potential for energy recovery through anaerobic digestion of sludge from a biological wastewater treatment sludge thickener (SW) and two non-conforming products from the sauce industry, Casa Mendes Gonçalves: a mayonnaise-type sauce (MYO) and a chocolate-based dessert (CHO). The biogas production was determined by the specific biogas production (SBP—the volume of biogas produced per mass of Volatile Solids (VS) fed to the reactor). MYO yielded the highest biogas production among the three substrates, though SW was present in much larger quantities than the non-conforming products (0.951 ± 0.125 NL/g-VS). To enhance biogas production, different ratios of these substrates were tested, including SW:MYO and SW:CHO at 50:50 and SW:MYO:CHO at 50:35:15. The highest biogas yield was achieved when all three substrates were combined (0.834 ± 0.042 NL/g-VS), with SW:MYO yielding the second-highest production (0.804 ± 0.040 NL/g-VS). Which corresponds to a theoretical electrical energy production of 2.27 kWh/kg-VS and 2.19 kWh/kg-VS, respectively. It is possible to conclude that the experimental data indicated the potential to generate 40 MWh/year of electricity while reducing greenhouse gas emissions. That demonstrates the dual benefit of anaerobic digestion by promoting the company’s sustainable development while providing economic gains.

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Enhancing the Potential of Sustainable Biogas Production from Sauce Industry Non-Conforming Products

  • 会议论文

  • 发表日期：

    2026年

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  • Andreia Duarte Santos,
  • Inna Shyshka,
  • João R. Silva,
  • Gonçalo Cordeiro,
  • Gabriela Rodrigues,
  • Rosa Quinta-Ferreira,
  • Luís M. Castro

摘要

Anaerobic digestion reduces landfill waste, offers a renewable alternative to fossil fuels, and supports environmental sustainability. Organic waste, especially from the food industry, can produce methane-rich biogas, replacing natural gas. Many industries can adopt this technology to reduce waste, treat effluents, and cut energy costs. The present study evaluated the potential for energy recovery through anaerobic digestion of sludge from a biological wastewater treatment sludge thickener (SW) and two non-conforming products from the sauce industry, Casa Mendes Gonçalves: a mayonnaise-type sauce (MYO) and a chocolate-based dessert (CHO). The biogas production was determined by the specific biogas production (SBP—the volume of biogas produced per mass of Volatile Solids (VS) fed to the reactor). MYO yielded the highest biogas production among the three substrates, though SW was present in much larger quantities than the non-conforming products (0.951 ± 0.125 NL/g-VS). To enhance biogas production, different ratios of these substrates were tested, including SW:MYO and SW:CHO at 50:50 and SW:MYO:CHO at 50:35:15. The highest biogas yield was achieved when all three substrates were combined (0.834 ± 0.042 NL/g-VS), with SW:MYO yielding the second-highest production (0.804 ± 0.040 NL/g-VS). Which corresponds to a theoretical electrical energy production of 2.27 kWh/kg-VS and 2.19 kWh/kg-VS, respectively. It is possible to conclude that the experimental data indicated the potential to generate 40 MWh/year of electricity while reducing greenhouse gas emissions. That demonstrates the dual benefit of anaerobic digestion by promoting the company’s sustainable development while providing economic gains.