Comparison of sludges produced from two different recirculating aquaculture systems (RAS) for recycle and disposal

Enriquez, Yemall Alexander Maigual; Maia, Alex Sandro Campos; Guerrero-Romero, Camilo L.; Matsumoto, Tsunao; Rangel, Elidiane Cipriano; Morais, Leandro Cardoso de

doi:10.1016/j.aquaculture.2018.11.060

Cited by 9 publications

(3 citation statements)

References 28 publications

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“…)/(δ13C initial − δ13C stand.)} × 100 (6) where δ13C P. gualpensis represents the final isotopic composition of organisms, δ13C initial represents the isotopic composition of aquaculture sludge, and δ13C standard represents the isotopic composition of wild Perinereis vallata in marine environments of the sub-Antarctic Magellan Strait [52,53].…”

Section: Organic Compounds Analysismentioning

confidence: 99%

“…Recirculating aquaculture systems (RAS) gained popularity in recent years due to their ability to operate independently of aquatic environments. Although these systems are designed to concentrate waste for easier handling, organic sludge generation and management remains a major challenge for aquaculture production in RAS [6,7]. Additionally, and despite significant advances in aquaculture nutrition research, the amount of sludge produced continues to be a substantial issue.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating the Bioremediation Capacity of the Polychaete Perinereis gualpensis (Jeldes, 1963) for Atlantic Salmon Aquaculture Sludge

Gómez,

Lara,

Hurtado

et al. 2023

Fishes

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The potential of polychaetes for the bioremediation of aquaculture sludge gained more attention in recent years. These organisms can reduce organic matter and nutrients contained in the sludge of several aquaculture species, improving the sustainability of these activities. The aim of this study was to evaluate the removal performance of Perinereis gualpensis (Jeldes, 1963) being fed with aquaculture sludge produced by a recirculating system cultivating Atlantic salmon. The experiment involved adding different amounts of sludge (10% and 20% with respect to total substrate) at a density of 300 organisms m−2 during 30 days. A treatment without sludge served as a control, using natural substrate. The highest removal rate of total organic matter (TOM) (23.95 ± 13.19 g m−2 day−1) was achieved by P. gualpensis with 20% sludge addition, a reduction of about 36% compared to the total amount added at the beginning of the trials. The organisms fed with aquaculture sludge presented higher nitrogen (8–9%) and carbon (40–43%) contents, with a maximum organic carbon assimilation of 32% in relation to the total content in the sludge. The high survival (88–95%) and positive growth rates (0.28% day−1) achieved by P. gualpensis indicated that this species can be sustained with salmon sludge as the only source of food. These results indicate that P. gualpensis is a promising candidate for removing nutrients from salmon effluents. Moreover, the protein contents achieved by the organisms (52–58%) meet the dietary protein requirements of several aquaculture species. Further research is needed to determine the maximum bioremediation capacity of this species and to evaluate the lipid content and fatty acid profiles of P. gualpensis to determine its potential application in aquaculture feed.

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Section: Organic Compounds Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluating the Bioremediation Capacity of the Polychaete Perinereis gualpensis (Jeldes, 1963) for Atlantic Salmon Aquaculture Sludge

Gómez,

Lara,

Hurtado

et al. 2023

Fishes

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“…In RAS, the aquaculture wastewater discharged from a pond is treated in a recirculating manner through a series of physicochemical and biochemical reactions. As a result, the recycling rate of aquaculture water can exceed 90%, which not only increases the recycling rate of aquaculture water, but also has marked advantages for keeping the aquaculture water environment stable and increasing the survival rate of cultured organisms 76 . The recirculating aquaculture technique has been extensively applied in fish and shrimp culture, but the technical availability and related work for its application in shellfish culture have not proceeded, and has widened gap with the technology‐intensive closed recirculating aquaculture of advanced countries in respect of facilities, equipment, technical processes, unit output and economic benefits 74…”

Section: Abalone Culturementioning

confidence: 99%

Transitions, challenges and trends in China's abalone culture industry

Gao

Zhang

Luo

et al. 2022

Reviews in Aquaculture

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Abalone species are economically important shellfish in China's aquaculture industry. In 2020, China's abalone aquaculture production was 203,500 tonnes, accounting for nearly 90% of total global production. However, many problems have accompanied the rapid development of this industry, including a reduction in near‐shore space suitable for culture and the risk of exposure of farms to natural disasters such as typhoons and red tides. In addition, high temperatures and low oxygen levels resulting from global climate change are causing increased abalone mortality in summer. In this review, the culture patterns and characteristics used in different countries are compared with respect to larvae nurseries, intermediate juvenile culture and the grow‐out phase. Next, the transitions and challenges in China's abalone culture industry over the past 60 years are summarized. Finally, a coordinated land‐sea program for reducing solid waste emissions into the water and increasing carbon sinks is suggested based on the ‘Carbon Neutrality’ theory. Under the framework of the program, new facilities, technologies and models should be created to achieve increased mechanization and a greater understanding of the abalone aquaculture industry as soon as possible. This review provides references and data to support the scientific planning and mapping of China's abalone culture industry as well as the transition of China's perceived identity from a major fishery country to a strong fishery power with an awareness of environmental protection and resource use.

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Anaerobic Co-Digestion of Fish Sludge Originating from a Recirculating Aquaculture System

Netshivhumbe,

Faloye,

Tolessa

et al. 2024

Waste Biomass Valor

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Anaerobic co-digestion (AcoD) of fish sludge (FS) with food waste (FW), and fruit and vegetable waste (FVW) for biogas and methane production was optimised in small-scale bioreactors, and batch and semi-continuous pilot-scale digesters, under mesophilic (37 ℃) conditions. An experimental mixture design was first applied to small-scale biomethane potential (BMP) tests, to determine the optimal mixture proportions of the AcoD of FS, FW, and FVW that maximise the specific methane yield (SMY in NmLCH4 gVS−1). The optimal mixture proportion was 67%FS:18%FW:19%FVW (w/w), producing 401 mLCH4 gVS−1, which was 8 times higher than the SMY when FS was mono-digested (48 mLCH4 gVS−1). The SMY achieved in batch pilot-scale digesters were 70–82% of methane yields obtained in BMP tests under the same operating conditions, with stable biogas production and no apparent inhibition during the batch run. Semi-continuous operation of the pilot-scale digester was undertaken with organic loading rates (OLRs) of 1, 2, and 3 $$gVS{L}^{-1}{d}^{-1}$$ g V S L - 1 d - 1 , provided intermittently. However, the digester did not achieve stable biogas production at all of the evaluated OLRs, due to the intermittent feeding and accumulation of volatile fatty acids (VFAs): Improved process stability was achieved at an OLR of 2 $$gVS{L}^{-1}{d}^{-1}$$ g V S L - 1 d - 1 , compared to OLRs of 1 and 3 $$gVS{L}^{-1}{d}^{-1}$$ g V S L - 1 d - 1 . Optimisation of the AcoD process resulted in attractive biomethane yields from FS with FW and FVW co-feeds, indicating that producing biogas from co-digestion of FS with relevant substrates is a valuable managing tool for FS, while simultaneously providing renewable energy. The work provides novel data that elucidated optimal proportions in which to combine FS, FW and FVW to obtain optimal biogas production, and provided important new information relevant for the scale up and continuous operation of an AD process for treating FS. Graphical Abstract

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Comparison of sludges produced from two different recirculating aquaculture systems (RAS) for recycle and disposal

Cited by 9 publications

References 28 publications

Evaluating the Bioremediation Capacity of the Polychaete Perinereis gualpensis (Jeldes, 1963) for Atlantic Salmon Aquaculture Sludge

Evaluating the Bioremediation Capacity of the Polychaete Perinereis gualpensis (Jeldes, 1963) for Atlantic Salmon Aquaculture Sludge

Transitions, challenges and trends in China's abalone culture industry

Anaerobic Co-Digestion of Fish Sludge Originating from a Recirculating Aquaculture System

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