Increasing Biocrude Yield of Food Waste HTL via Combined Feedstocks
Publication: World Environmental and Water Resources Congress 2024
ABSTRACT
This research aims to improve the overall energy yield of the conversion of food waste feedstocks to biocrude via hydrothermal liquefaction (HTL) by adding food waste feedstocks of high or low water content until the combined mixture achieves optimum 80% water content. Six single food waste feedstocks were processed individually via HTL to determine unadulterated biocrude yield. The three food waste feedstocks of lower water content (i.e., spent coffee grounds, spent tea leaves, and spent grain) were supplemented with water until 80% water content was achieved, while the three food waste feedstocks of higher water content (i.e., spent yeast, spent hops, and raspberry puree) were used as received for the HTL conversion process. Nine feedstock combinations at 80% water content were created, each consisting of one higher water content feedstock and one lower water content feedstock, and were processed via co-HTL conversion. By-products of biochar, aqueous co-product (i.e., ACP or wastewater), and biocrude were separated and measured in order to determine the yield of each. Of the single feedstock HTL reactions, raspberry puree, spent tea leaves, and spent yeast had the highest oil yield. Of the nine combined feedstock co-HTL reactions, two (yeast/tea and hops/coffee) produced a greater quantity of biocrude than expected, and seven combined feedstock co-HTL reactions produced less biocrude than expected. All but one of the combined feedstocks produced significantly less ACP than expected, which would help lessen the strain placed on wastewater treatment plants by HTL conversion on a larger scale.
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Information & Authors
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Published In
World Environmental and Water Resources Congress 2024
Pages: 1099 - 1109
History
Published online: May 16, 2024
ASCE Technical Topics:
- Engineering materials (by type)
- Environmental engineering
- Hydration
- Hydrologic engineering
- Hydrologic properties
- Hydrology
- Industrial wastes
- Laminating
- Materials engineering
- Materials processing
- Pollutants
- Recycling
- Solid wastes
- Waste management
- Wastes
- Wastewater treatment plants
- Water and water resources
- Water content
- Water management
- Water supply
- Water treatment
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