Numerical analysis of particulate organic waste diffusion in an aquaculture area of Gokasho Bay, Japan

Zhang, Junbo; Kitazawa, Daisuke

doi:10.1016/j.marpolbul.2015.02.007

Cited by 14 publications

(8 citation statements)

References 40 publications

(59 reference statements)

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“…In sediments from the Arabian Sea, increasing amounts of Ca-associated P with depth were investigated [31]. It was confirmed that fecal matter from fish cultured in sea cages can contribute up to 80% to particulate organic waste in the direct aquatic environment [34]. Since the solid African catfish RAS waste exclusively contains Ca-bound P compounds, it seems reasonable to assume that such waste can also contribute to high amounts of Ca-associated P in marine sediments.…”

Section: P Xanes Spectroscopymentioning

confidence: 93%

“…Fish fecal matter has not yet been investigated by this Pspeciation method leaving the P speciation of solid RAS waste almost unknown. Furthermore, this material can be transported over long distances and contribute to the composition of sediments at sea bottoms [34]. For the above knowledge gaps concerning P in fish fecal matter there is no indication whether distinct P compounds occurring at the bottom of aquatic environments can have their origin in fish fecal matter.…”

Section: Introductionmentioning

confidence: 99%

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Organic Matter Composition and Phosphorus Speciation of Solid Waste from an African Catfish Recirculating Aquaculture System

et al. 2020

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Recycling of phosphorus (P) from feed input in aquaculture systems gains increasing importance, especially relating to sustainable agriculture and food production. In order to find possible areas of application of African catfish solid waste, the purpose of this study was to characterize the elemental and organic matter composition and P speciation in the aquaculture fish waste. Pyrolysis-field ionization mass spectrometry (Py-FIMS) was used to investigate the composition of organic matter and P K-edge X-ray absorption near edge structure (XANES) spectroscopy to describe the occurring P-containing compounds in African catfish solid waste from an intensive recirculation aquaculture system (RAS). The solid fish waste was mainly composed of sterols, free fatty acids and alkylaromatics, as it is common for digestive systems of animals. Ingredients such as the phytosterol beta-sitosterin confirm plant-based feed ingredients and some recalcitrance against digestion in the African catfish gut. The P in the solid fish waste was exclusively bound as calcium-phosphates. These calcium-phosphate minerals as major constituents of African catfish waste may have beneficial effects when applied to soils, suggesting the use of this waste as possible soil amendment in the future.

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Section: P Xanes Spectroscopymentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Organic Matter Composition and Phosphorus Speciation of Solid Waste from an African Catfish Recirculating Aquaculture System

et al. 2020

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“…A study reported that the amounts of feed waste derived from common carp ( Cyprinus carpio ) (27 ± 3.1 g) and Nile tilapia ( Oreochromis niloticus ) (33 ± 3.4 g) cultured in a RAS were 4.1~4.8% and 3.6~4.0% of the feed fed, respectively; the amounts of fecal solids produced by common carp and Nile tilapia were 37.9% and 35.7% of the feed intake, respectively (Lee ). In the Bay aquaculture, Zhang and Kitazawa () used a 3D numerical model coupled with developed submodels of fish cage drag and aquaculture waste diffusion to perform numerical analysis of the particulate organic waste distribution. The results showed that the distribution of particulate organic waste changed depending on the season, and fish faeces accounted for a major proportion (approximately 80%) during the winter, while uneaten feed was the main source of particulate organic waste during the other seasons.…”

Section: Generation and Characterization Of Solidsmentioning

confidence: 99%

Generation, characterization, perniciousness, removal and reutilization of solids in aquaculture water: a review from the whole process perspective

Bao

Zhu

Jin

et al. 2018

Reviews in Aquaculture

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The generation of solids by aquaculture activities has led to many problems in animal welfare, environmental quality, water treatment effects and public health, such as gill and intestinal damage, water eutrophication, system components blockages and antibiotics transfers through the food chain to human; thus, effective solid wastes management is very important. The purpose of this review is to summarize the sources, characterization methods, harmfulness, removal technologies and reutilization of solids in aquaculture water, including (i) different sources of solids, such as uneaten feed, feces and debris; (ii) solids characterization based on the general parameters, particle size distribution and chemical composition; (iii) the toxicity and detriment of solids to cultured species, the environment, aquaculture system components and human health; (iv) Solids removal, effluents solids thickening and source control techniques for better solids management; and (v) various methods for the reutilization of aquacultural solid wastes for resource value-adding. In addition to these five specific objectives, the merits and drawbacks of each method or technology and future research priorities are discussed. The present review provides an understanding of the role played by solids in aquaculture water and provides guidance for aquacultural solid wastes precision management, aquaculture practices and technological developments. Thus, solids management can be carried out based on this guidance to improve animal welfare and the stability of water treatment systems, reduce harm to the environment and public health, and enable the development of aquaculture in a sustainable way.

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“…Activities in coastal oceans can help to speed up economic construction, but meantime it will cause serious pollution to marine ecosystems. A number of numerical studies have been carried out to simulate pollutant dispersion [4,5,6,7]. A two-dimensional water quality model was developed and applied to analyze and optimize the ecological programs, and it can simulate key model variables (NH 4 + -N, PO 4 3− -P, chemical oxygen demand, and water level) [8].…”

Section: Introductionmentioning

confidence: 99%

Application of Dynamically Constrained Interpolation Methodology to the Surface Nitrogen Concentration in the Bohai Sea

Zheng

2019

IJERPH

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Observations of ocean pollutants are usually spatiotemporally dispersive, while it is of great importance to obtain continuous distribution of ocean pollutants in a certain area. In this paper, a dynamically constrained interpolated methodology (DCIM) is proposed to interpolate surface nitrogen concentration (SNC) in the Bohai Sea. The DCIM takes the pollutant transport advection diffusion equation as a dynamic constraint to interpolate SNCs and optimizes the interpolation results with adjoint method. Feasibility and validity of the DCIM are testified by ideal twin experiments. In ideal experiments, mean absolute gross errors between interpolated observations and final interpolated SNCs are all no more than 0.03 mg/L, demonstrating that the DCIM can provide convincing results. In practical experiment, SNCs are interpolated and the final interpolated surface nitrogen distribution is acquired. Correlation coefficient between interpolated and observed SNCs is 0.77. In addition, distribution of the final interpolated SNCs shows a good agreement with the observed ones.

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Numerical analysis of particulate organic waste diffusion in an aquaculture area of Gokasho Bay, Japan

Cited by 14 publications

References 40 publications

Organic Matter Composition and Phosphorus Speciation of Solid Waste from an African Catfish Recirculating Aquaculture System

Organic Matter Composition and Phosphorus Speciation of Solid Waste from an African Catfish Recirculating Aquaculture System

Generation, characterization, perniciousness, removal and reutilization of solids in aquaculture water: a review from the whole process perspective

Application of Dynamically Constrained Interpolation Methodology to the Surface Nitrogen Concentration in the Bohai Sea

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