Modelling and controlling dissolved oxygen in recirculating aquaculture systems based on mechanism analysis and an adaptive PID controller

Operation and effluent treatment costs are limiting factors for the success of recirculating aquaculture systems (RAS) in meeting seafood demand in the United States. Adopting a capture-and-reuse waste management model similar to terrestrial agriculture farmers would allow RAS farmers to monetize effluent and offset production costs. The moisture content and nutrient profile of RAS effluent makes it a potential option for use as a hydroponic fertilizer. Treatment of RAS waste is needed to mineralize particulate-bound nutrients before becoming a viable hydroponic nutrient solution. Anaerobic treatment (AT), a method used by municipal and agricultural waste treatment facilities to reduce total solids, has been shown to successfully mineralize particulate-bound nutrients from RAS effluent. Continuously mixed anaerobic batch bioreactors were used to evaluate the degree to which AT may mineralize particulate-bound nutrients in solid RAS waste. Concentrations of twelve different macro- and micro-nutrients were analyzed in the waste before and after treatment. Effluent samples were analyzed to determine the fraction of each nutrient in the solid and aqueous forms. This study showed that AT is an effective method to mineralize particulate-bound nutrients in RAS effluent and the mineralization rate data may be used to design a pilot-scaled flow-through RAS effluent treatment system.

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Assessment of aeration plug-flow devices used with recirculating aquaculture systems on the growth of tilapia Oreochromis niloticus

Aquacultural Engineering ◽

10.1016/j.aquaeng.2020.102116 ◽

2020 ◽

Vol 91 ◽

pp. 102116

Author(s):

Gengfeng Xiao ◽

Xiangju Cheng ◽

Jun Xie ◽

Dantong Zhu

Keyword(s):

Oreochromis Niloticus ◽

Plug Flow ◽

Recirculating Aquaculture ◽

Recirculating Aquaculture Systems ◽

Flow Devices

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Microscreen effects on water quality in replicated recirculating aquaculture systems

Aquacultural Engineering ◽

10.1016/j.aquaeng.2014.10.007 ◽

2015 ◽

Vol 65 ◽

pp. 17-26 ◽

Cited By ~ 20

Author(s):

Paulo Fernandes ◽

Lars-Flemming Pedersen ◽

Per Bovbjerg Pedersen

Keyword(s):

Water Quality ◽

Recirculating Aquaculture ◽

Recirculating Aquaculture Systems

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The Water Quality Management for Recirculating Aquaculture System by Applying Nano Adsorption Technology

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2021.19202 ◽

2021 ◽

Vol 21 (7) ◽

pp. 3975-3979

Author(s):

Min-Jin Hwang ◽

Jeongmin Cha ◽

Eun-Sik Kim

Keyword(s):

Water Quality ◽

Water Quality Management ◽

Reduction Rate ◽

Fish Farming ◽

Analytical Relationship ◽

Pumice Stone ◽

Recirculating Aquaculture ◽

Recirculating Aquaculture Systems ◽

Aquaculture Water

In a fish farm, the water quality is important to ensure fish growth and farm productivity. However, the study of the quality of water using in aquaculture has been ignored until now. Although there are several methods to treat water, nanomaterials have not yet been applied for indoor fish farming because it may difficult to supply a sufficient amount of water, and the operating parameters have not been developed for recirculating aquaculture systems. Nanotechnology can be applied to treat water, specifically through adsorption and filtration, to produce drinking water from surface water and to treat wastewater by processing a high volume of effluent. The adsorption and filtration of seawater has also progressed to allow for desalination of seawater, and this is recognized as a necessary tool for extended treatment protocols of various types of seawater. This study investigated the treatment of aquaculture water using nano-porous adsorbents (e.g., pumice stone) to control the contaminants in seawater in order to maintain the water quality required for aquaculture. The results are used to derive an analytical relationship between the ionic species in aquaculture water, and this provides empirical parameters for a batch reactor for aquaculture. The quality of the influent and effluent for aquaculture is compared using time-series analyses to evaluate the reduction rate of ionic components and thus suggest the optimum condition for fish farming using bioreactor processes.

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