The purpose of the study was to examine the biogas potential from anaerobic digestion of alkaline fish glycerin (AFG) and spent bleaching earth (SBE) from omega‑3 fish oil refining. Both fractions show promising use in biogas production feedstock. However, the literature review on SBE from fish oil refining was limited to one publication. Publication with AFG did not exist at our knowledge but publication on a similar product, crude glycerin from biodiesel production, seems to be more developed.
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