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Primary Sludge from Dairy and Meat Processing Wastewater and Waste from Biomass Enzymatic Hydrolysis as Resources in Anaerobic Digestion and Co-Digestion Supplemented with Biodegradable Surfactants as Process Enhancers

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  • Eriks Skripsts

    (Bio RE Ltd., Vadzu 34, LV-1024 Riga, Latvia)

  • Linda Mezule

    (Linda Mežule Water Research and Environmental Biotechnology Laboratory, Riga Technical University, P. Valdena 1-303, LV-1048 Riga, Latvia)

  • Elvis Klaucans

    (Bio RE Ltd., Vadzu 34, LV-1024 Riga, Latvia)

Abstract

Incorporation of various alternative resources as co-digestion substrates aids to reduce the consumption of agricultural crops for biogas production. However, the efficiency and limitations of these co-substrates is still not fully understood. Use of biomass waste remaining after enzymatic hydrolysis for high value chemical fermentation, meat processing and dairy wastewater primary sludge as co-substrates in an agricultural resource anaerobic digestion plant is tackled within this study. The results showed that anionic surfactants (<200 ppm) can be used to improve fat, oil and grease (FOG) solubility in water and, at the same time, enhance the biomethane potential of FOG-containing sludge by increasing it from 1374.5 to 1765 mLCH 4 /gVS for meat processing wastewater primary sludge, and from 534 to 740 mLCH 4 /gVS for dairy wastewater primary sludge, when agricultural digestate is used as a substrate and sludge loading is not more than 10% from the volatile solids loaded. At the same time, only 549.7 mLCH 4 /gVS was produced as 30-day BMP when 5% biomass hydrolysis waste was used. Biomass hydrolysis waste co-digestion with primary sludge from dairy and meat processing wastewaters has an antigenic effect, and separate substrate anaerobic digestion gave a better results, thus, showing that excessive combination of various waste resources can be inhibitory for biogas production and the appropriate substrate selection and combination is a technical challenge for the biogas industry.

Suggested Citation

  • Eriks Skripsts & Linda Mezule & Elvis Klaucans, 2022. "Primary Sludge from Dairy and Meat Processing Wastewater and Waste from Biomass Enzymatic Hydrolysis as Resources in Anaerobic Digestion and Co-Digestion Supplemented with Biodegradable Surfactants as," Energies, MDPI, vol. 15(12), pages 1-15, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:12:p:4333-:d:838034
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    References listed on IDEAS

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    1. Vasiliki Kamperidou & Paschalina Terzopoulou, 2021. "Anaerobic Digestion of Lignocellulosic Waste Materials," Sustainability, MDPI, vol. 13(22), pages 1-23, November.
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