Impact of FNA/NO2-based disintegration on the biodegradability of fish sludge and methane yield in co-digestion with waste activated sludge
DOI:
https://doi.org/10.36119/15.2026.1.1Keywords:
fish sludge, WAS, FNA, anaerobic digestionAbstract
Recirculating Aquaculture Systems (RAS) are widespread in fish farms globally. The distinctive characteristics and composition of fish sludge (FS), comprising fish feces and food remnants, from RAS systems, render them a valuable resource for anaerobic digestion processes. Free Nitrous Acid (FNA) disintegration of waste activated sludge (WAS) is known as a beneficial method for enhancing methane generation. Despite the fact that fish sludge is frequently co-digested with waste activated sludge, there are no studies on the efficiency of the FNA method concerning this medium.
In this study, findings revealed that fish sludge addition can increase FNA disintegration efficiency up to 42.8% (30%FS).
Unfortunately, methane production was not clearly correlated with the SCOD increase. The greatest increase in methane
production was recorded for 30% FS addition into WAS and amounted to 10% compared to the reference sample.
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References
[1] APHA, 2000. 5220 CHEMICAL OXYGEN DEMAND (COD), w: Standard Methods for the Examination of Water and Wastewater.
[2] Choudhury, A., Lepine, C., Good, C., 2023. Methane and Hydrogen Sulfide Production from the Anaerobic Digestion of Fish Sludge from Recirculating Aquaculture Systems: Effect
of Varying Initial Solid Concentrations.
[3] Christou, M.L., Vasileiadis, S., Kalamaras, S.D., Karpouzas, D.G., Angelidaki, I., Kotsopoulos, A., 2021. Ammonia-induced inhibition of manure-based continuous biomethanation process under different organic loading rates and associated microbial community dynamics. Bioresour. Technol. 320, 124323. https://doi.org/10.1016/j.biortech.2020.124323
