scholarly journals Comparison of nutrients and fatty acid of wild and hatchery fingerlings of Clarias gariepinus fed five formulated feeds and cultured in recirculating aquaculture system

2021 ◽  
Vol 9 (2) ◽  
pp. 14-18
Author(s):  
Elsadig A Hagar ◽  
Zuheir N Mahmoud ◽  
Abdelrahman I Elhag
Keyword(s):  
Fatty Acid ◽  
Clarias Gariepinus ◽  
Recirculating Aquaculture System ◽  
Recirculating Aquaculture ◽  
Aquaculture System

Variation of Water Quality in Fish Farm Using Recirculating Aquaculture System for Fancy Carp

2018 ◽  
Vol 19 (1) ◽  
pp. 37-45
Author(s):  
Woo Jin Lee ◽  
Seon Woo Baek ◽  
Ha Na Seo ◽  
Byeong Wook Kong ◽  
Deog Gwan Ra ◽  
...  
Keyword(s):  
Water Quality ◽  
Fish Farm ◽  
Recirculating Aquaculture System ◽  
Recirculating Aquaculture ◽  
Aquaculture System

scholarly journals Denitrification Control in a Recirculating Aquaculture System—A Simulation Study

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1306
Author(s):  
Pedro Almeida ◽  
Laurent Dewasme ◽  
Alain Vande Wouwer
Keyword(s):  
Carbon Source ◽  
Carbon Sources ◽  
Aquatic Organisms ◽  
Operating Conditions ◽  
Toxic Substances ◽  
Recirculating Aquaculture System ◽  
Treatment Technology ◽  
Tuning Method ◽  
Recirculating Aquaculture ◽  
Aquaculture System

The recirculating aquaculture system (RAS) is a land-based water treatment technology, which allows for farming aquatic organisms, such as fish, by reusing the water in the production (often less than 5%). This technology is based on the use of filters, either mechanical or biological, and can, in principle, be used for any species grown in aquaculture. Due to the low recirculation rate, ammonia accumulates in the system and must be converted into nitrate using nitrification reactors. Although less toxic for fish, nitrate can also be further reduced into nitrogen gas by the use of denitrification biofilters which may create several issues, such as incomplete denitrification, resulting in toxic substances, such as nitrite and nitric oxide, or a waste of carbon source in excess. Control of the added quantity of carbon source in the denitrification biofilter is then mandatory to keep nitrate/nitrite concentrations under toxic levels for fish and in accordance with local effluent regulations, and to reduce costs related to wasted organic carbon sources. This study therefore investigates the application of different control methodologies to a denitrification reactor in a RAS. To this end, a numerical simulator is built to predict the RAS behavior and to allow for the comparison of different control approaches, in the presence of changes in the operating conditions, such as fish density and biofilter removal efficiency. First, a classical proportional-integral-derivative (PID) controller was designed, based on an SIMC tuning method depending on the amount of ammonia excreted by fish. Then, linearizing and cascade controllers were considered as possible alternatives.

scholarly journals Effect of CO2 on elemental concentrations in recirculating aquaculture system tanks

Aquaculture ◽  
2019 ◽  
Vol 511 ◽  
pp. 734254
Author(s):  
Shazia N. Aslam ◽  
Sharada Navada ◽  
Gisle R. Bye ◽  
Vasco C. Mota ◽  
Bendik Fyhn Terjesen ◽  
...  
Keyword(s):  
Recirculating Aquaculture System ◽  
Elemental Concentrations ◽  
Recirculating Aquaculture ◽  
Aquaculture System

scholarly journals Start-up of a “zero-discharge” recirculating aquaculture system using woodchip denitrification, constructed wetland, and sand infiltration

2021 ◽  
Vol 93 ◽  
pp. 102161
Author(s):  
Jani T. Pulkkinen ◽  
Anna-Kaisa Ronkanen ◽  
Antti Pasanen ◽  
Sepideh Kiani ◽  
Tapio Kiuru ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Recirculating Aquaculture System ◽  
Recirculating Aquaculture ◽  
Aquaculture System ◽  
Start Up ◽  
Zero Discharge
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