Improved utilization of fish waste by anaerobic digestion following omega-3 fatty acids extraction.

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Improved utilization of fish waste by anaerobic digestion following omega-3 fatty acids extraction. / Ivo Achu, Nges; Mbatia, Betty; Björnsson, Lovisa.

In: Journal of Environmental Management, Vol. 110, 2012, p. 159-165.

Research output: Contribution to journalArticle

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TY - JOUR

T1 - Improved utilization of fish waste by anaerobic digestion following omega-3 fatty acids extraction.

AU - Ivo Achu, Nges

AU - Mbatia, Betty

AU - Björnsson, Lovisa

PY - 2012

Y1 - 2012

N2 - Fish waste is a potentially valuable resource from which high-value products can be obtained. Anaerobic digestion of the original fish waste and the fish sludge remaining after enzymatic pre-treatment to extract fish oil and fish protein hydrolysate was evaluated regarding the potential for methane production. The results showed high biodegradability of both fish sludge and fish waste, giving specific methane yields of 742 and 828 m(3)CH(4)/tons VS added, respectively. However, chemical analysis showed high concentrations of light metals which, together with high fat and protein contents, could be inhibitory to methanogenic bacteria. The feasibility of co-digesting the fish sludge with a carbohydrate-rich residue from crop production was thus investigated, and a full-scale process outlined for converting odorous fish waste to useful products.

AB - Fish waste is a potentially valuable resource from which high-value products can be obtained. Anaerobic digestion of the original fish waste and the fish sludge remaining after enzymatic pre-treatment to extract fish oil and fish protein hydrolysate was evaluated regarding the potential for methane production. The results showed high biodegradability of both fish sludge and fish waste, giving specific methane yields of 742 and 828 m(3)CH(4)/tons VS added, respectively. However, chemical analysis showed high concentrations of light metals which, together with high fat and protein contents, could be inhibitory to methanogenic bacteria. The feasibility of co-digesting the fish sludge with a carbohydrate-rich residue from crop production was thus investigated, and a full-scale process outlined for converting odorous fish waste to useful products.

KW - Biogas

KW - Salmon waste

KW - Jerusalem artichoke

U2 - 10.1016/j.jenvman.2012.06.011

DO - 10.1016/j.jenvman.2012.06.011

M3 - Article

VL - 110

SP - 159

EP - 165

JO - Advances in Environmental Research

T2 - Advances in Environmental Research

JF - Advances in Environmental Research

SN - 0301-4797

ER -