A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Anaerobic Digestion of Seaweed (Ecklonia Maxima) and Seaweed Residues for Quality Biogas Production
https://orcid.org/0000-0001-6484-3478
Abstract Seaweed has been identified as a potential feedstock for biorefineries. Anaerobic digestion (AD) is a promising technology to transform seaweed biomass into biogas, and could make an important contribution to recovering energy to drive a potential biorefinery. In this study, AD of Ecklonia maxima seaweed and its residues after enzymatic hydrolysis was optimized for biogas production at both bench- and pilot-scale. A standard Box-Behnken statistical design with 3 factors at 3 levels was employed to determine the effects of operating conditions (temperature, solids loading, and inoculum-to-substrate ratio) on biogas production yield and composition, for both raw seaweed and enzymatic hydrolysis residues. Bench-scale optimization resulted in biogas production of 256 and 259 ml CH4/gVS for raw seaweed and solid hydrolysis residues at mesophilic temperature (38.8 and 37.4 °C), solid loading (3.6 and 4.3 wt%), and inoculum to substrate ratio (4.1 and 3.9), with methane contents of 62% and 70%, respectively. Even if the methane yields and contents seem very similar between the two substrates, the finding suggests that the optimal processing conditions for maximizing the biomethane yield from seaweed processing residues might not necessarily coincide with the optimal conditions for seaweed in its raw form. Pilot-scale runs in 30 L digesters at centre point conditions resulted in similar quantities of biogas production for both feedstocks, although methane contents and yields were 88% of the highest values recorded at bench scale. Results demonstrated the suitability of both raw seaweed and the residues remaining after enzymatic hydrolysis as feedstocks for AD, and that solid residues post-enzymatic hydrolysis have a slightly higher biomethane potential than the raw seaweed. Elemental analyses of both feedstocks were compared to fertilizer guidelines, with the results indicating that all heavy metal concentrations were below the limiting values. In conclusion, the study is significant in that it provides data on how to treat residues that originate from a ‘typical’ seaweed biorefinery and derive bioenergy from the residues through AD.
Anaerobic Digestion of Seaweed (Ecklonia Maxima) and Seaweed Residues for Quality Biogas Production
https://orcid.org/0000-0001-6484-3478
Abstract Seaweed has been identified as a potential feedstock for biorefineries. Anaerobic digestion (AD) is a promising technology to transform seaweed biomass into biogas, and could make an important contribution to recovering energy to drive a potential biorefinery. In this study, AD of Ecklonia maxima seaweed and its residues after enzymatic hydrolysis was optimized for biogas production at both bench- and pilot-scale. A standard Box-Behnken statistical design with 3 factors at 3 levels was employed to determine the effects of operating conditions (temperature, solids loading, and inoculum-to-substrate ratio) on biogas production yield and composition, for both raw seaweed and enzymatic hydrolysis residues. Bench-scale optimization resulted in biogas production of 256 and 259 ml CH4/gVS for raw seaweed and solid hydrolysis residues at mesophilic temperature (38.8 and 37.4 °C), solid loading (3.6 and 4.3 wt%), and inoculum to substrate ratio (4.1 and 3.9), with methane contents of 62% and 70%, respectively. Even if the methane yields and contents seem very similar between the two substrates, the finding suggests that the optimal processing conditions for maximizing the biomethane yield from seaweed processing residues might not necessarily coincide with the optimal conditions for seaweed in its raw form. Pilot-scale runs in 30 L digesters at centre point conditions resulted in similar quantities of biogas production for both feedstocks, although methane contents and yields were 88% of the highest values recorded at bench scale. Results demonstrated the suitability of both raw seaweed and the residues remaining after enzymatic hydrolysis as feedstocks for AD, and that solid residues post-enzymatic hydrolysis have a slightly higher biomethane potential than the raw seaweed. Elemental analyses of both feedstocks were compared to fertilizer guidelines, with the results indicating that all heavy metal concentrations were below the limiting values. In conclusion, the study is significant in that it provides data on how to treat residues that originate from a ‘typical’ seaweed biorefinery and derive bioenergy from the residues through AD.
Anaerobic Digestion of Seaweed (Ecklonia Maxima) and Seaweed Residues for Quality Biogas Production
https://orcid.org/0000-0001-6484-3478
Abstract Seaweed has been identified as a potential feedstock for biorefineries. Anaerobic digestion (AD) is a promising technology to transform seaweed biomass into biogas, and could make an important contribution to recovering energy to drive a potential biorefinery. In this study, AD of Ecklonia maxima seaweed and its residues after enzymatic hydrolysis was optimized for biogas production at both bench- and pilot-scale. A standard Box-Behnken statistical design with 3 factors at 3 levels was employed to determine the effects of operating conditions (temperature, solids loading, and inoculum-to-substrate ratio) on biogas production yield and composition, for both raw seaweed and enzymatic hydrolysis residues. Bench-scale optimization resulted in biogas production of 256 and 259 ml CH4/gVS for raw seaweed and solid hydrolysis residues at mesophilic temperature (38.8 and 37.4 °C), solid loading (3.6 and 4.3 wt%), and inoculum to substrate ratio (4.1 and 3.9), with methane contents of 62% and 70%, respectively. Even if the methane yields and contents seem very similar between the two substrates, the finding suggests that the optimal processing conditions for maximizing the biomethane yield from seaweed processing residues might not necessarily coincide with the optimal conditions for seaweed in its raw form. Pilot-scale runs in 30 L digesters at centre point conditions resulted in similar quantities of biogas production for both feedstocks, although methane contents and yields were 88% of the highest values recorded at bench scale. Results demonstrated the suitability of both raw seaweed and the residues remaining after enzymatic hydrolysis as feedstocks for AD, and that solid residues post-enzymatic hydrolysis have a slightly higher biomethane potential than the raw seaweed. Elemental analyses of both feedstocks were compared to fertilizer guidelines, with the results indicating that all heavy metal concentrations were below the limiting values. In conclusion, the study is significant in that it provides data on how to treat residues that originate from a ‘typical’ seaweed biorefinery and derive bioenergy from the residues through AD.
Anaerobic Digestion of Seaweed (Ecklonia Maxima) and Seaweed Residues for Quality Biogas Production
Waste Biomass Valor
Border, Allistair (author) / Tolessa, Amsalu (author) / Görgens, Johann (author) / Goosen, Neill (author)
2025-01-17
Article (Journal)
Electronic Resource
English