Improved water quality by means of protein skimming, biofiltration and ozonation (39939/104140)

Project Details

Description

There is a general need ensure stable and high water quality in recirculation aquaculture systems (RAS), as waste products tends to accumulate in intensive RASs with high feed loading and long retention times.

Accumulation of bacteria and other microparticles are generally unwanted in RAS water, but it is difficult to control only by traditional mechanical filtration.

This project investigates protein skimming, biofiltration & ozonation (”ProBiOzon”) applied to aquaculture water. The three well-known treatment processes are tested and modified under controlled conditions at the experimental aquaculture facilities at DTU Aqua, Section for Aquaculture, Hirtshals. The findings and experience will be applied by testing and demonstration in full scale commercial RAS.

The project activities include among others

- WP 2) batch and pilot scale studies with protein skimmer including test and demonstration of commercial scale proteinskimmer in fresh- and seawater RAS. Test and implementation of simple, alternative solution to capture protein foam will also be performed.

- WP3) test and validation of improved ozonation generation, ozone transfer and disinfection under commercial RAS conditions.

- WP4) investigations of the consequences of increased bacterial load on juvenile fish performance. Disease free fish will be exposed to various water matrixes (rejectwater from protein skimmers or water with high bacterial content) and fish performance will be assessed and evaluated.

- WP5) New approaches to reduce startup time and colonization of nitrifying bacteria particularly in seawater. Porous foam carriers will also be tested as media (N-removal capacity and organic matter entrapment) and potentials and effects of backwashing will be evaluated.

This applied research project strives to combine basic research with evaluation under commercial conditions and is based on collaboration with industrial partners.

Partners   
National Institute of Aquatic Resources, DTU Aqua (coordinator)
Oxyguard International A/S, Denmark
Water ApS, Denmark
Danish Aquaculture Association, Denmark
Aquacircle, Denmark
Commercial recirculating aquaculture systems, FW and SW, Denmark

Funding
This project is funded by the European Maritime and Fisheries Fund and the Danish Fisheries Agency. 

Research area: Aquaculture
AcronymProBiOzon
StatusFinished
Effective start/end date01/11/202130/09/2023

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