We will examine how water hydraulics in circular and rectangular tanks and water treatment strategy, influence the content of organic matter, microbial communities and the quality of product. In addition, we on developing a new type of sensor for carbon dioxide in RAS systems.
The project is funded by ERANET, COFASAP and is a research collaboration between SINTEF OCEAN AS, University of Copenhagen and CIIMAR, Portugal. In addition students (Masters ad PhD) from NTNU participate in parts of the program. The experiment are carried out at NTNU Sealabs new RAS facility.
WP1 : Tank Hydraulics
WP2 : Removal of Organic matter in RAS
WP3 : Effects on microbial communities
WP4 : Effect on Off-flavour
WP5 : Effects on Dissolved Carbon Dioxide
- To characterize the consequence of diﬀerent levels of organic matter removal (high, low) in LBCC-RAS on: (1) conventional water quality parameters, (2) heterotrophic microbial carrying capacity, bacterial stability and nitriﬁcation eﬃciency, (3) the biological processes that cause oﬀ-ﬂavour production, and (4) dissolved CO2.
- To demonstrate the water ﬂow pattern in circular and plug-ﬂow rearing in LBCC-RAS to obtain improved self-cleaning and high water quality conditions for ﬁsh.
- To develop an overall tank design for water ﬂow in ﬁsh tanks/raceways in LBCC-RAS that facilitates early removal of particles.
- To demonstrate the usefulness of a dissolved CO2 sensing platform for approximation of RAS organic load.
- Workshop with all partners (R&D and Industry) in Velje Denmark
- Workshop with all partners involved in experiment in the mini RAS system at NTNU Trondheim
- Established the experimental RAS set up at NTNU, Sealab in Trondheim Norway
- Developed a new treatment setup for removal of organic matter in the experimental setup
- Done ﬁrst experiment testing how turbulence from ﬁshes inﬂuences the movement of particles in a circular tank system.
- Started the development and initial test of the new CO2 sensor
- Diﬀerent taxonomic groups of oﬀ-ﬂavour producing microorganisms were identiﬁed in bioﬁlter of a recirculated system in Denmark
Expected impact of project for policy/industry/other stakeholder and future perspectives:
The project will pave the way for further innovation of Landbased Closed Containment (LBCC)-RAS systems. The deliverables provides necessary knowledge important for successful development of both inland aquaculture and smolt / post-smolt farms. By helping decreasing waste eﬄuents and bio-deposit impacts, and these measures will allow for an increased and improved aquaculture production, even in environmental sensitive areas. The project aim to improve strategies and technology for optimum control of the production environment, but will also help in safeguarding ﬁsh quality and animal welfare. We believe that the project will:
- Provide ideas for simpler, lower capital expenditure, more compact, eﬃcient and well performing RAS systems
- Develop new and integrated knowledge on production and mitigation on oﬀ-ﬂavour compounds in RAS
- Deliver new directions for optimum control of the water body inside the a ﬁsh tank. The results are particular important for Portugal, since the country wants to develop inland aquaculture, and LBCC- RAS is signalised as the preferred technology by the authorities.
Results from the project are also expected to be of major importance for improving the water quality in LBCC-RAS in Denmark and Norway, where a signiﬁcant production ﬁsh already occurs. Denmark has their "model dambrug" and nitrogen quotas, whilst Norway have opened up for further expansion of salmon production to harvest size LBCC-RAS systems. The challenges they will meet in water and product quality will be addressed in this project and strategies and water treatment solutions will be published so they are available as scientiﬁc background for the industry and authorities.