Key impacts in different production systems - a scientific perspective

Transcription

1 Key impacts in different production systems - a scientific perspective 1 DTU Aqua, Technical University of Denmark ALFRED JOKUMSEN National Institute of Aquatic Resources DTU Aqua North Sea Science Park, Hirtshals DENMARK ajo@aqua.dtu.dk

2 Fresh Water Rainbow Trout production World production: 0.5 mio. ton Value : 1.5 bill. USD 2 DTU Aqua, Technical University of Denmark Source: FAO

3 Current key impacts of FW Trout farming Water use Escapees Habitat conversion Discharges Fish health/welfare Feed ingredients Energy efficiency and carbon foot print Predator control Social/community 3 DTU Aqua, Technical University of Denmark

4 Freshwater Trout production systems Flow-through systems 4 DTU Aqua, Technical University of Denmark

5 Freshwater Trout production systems Recirculation Technology systems 5 DTU Aqua, Technical University of Denmark

6 Intensive recirculation system Filter for denitrification 5 4 Submerged Biological Filter 6 Trickling Filter 1 Water from fish tanks Mechanical Filter 2 Oxygen Cone 10 Water to fish tanks 9 UV-Filter Water to fish tanks Pump Sump 1 Return pumps String 1 String 2 Pump Sump 2 7 Proppeller pumps Pressure pumps Bypass pipe for water equalising Low water consumption Low zero environmental impact Independency on river water 6 DTU Aqua, Technical University of Denmark

7 Water resource Flow through system Issues: High water intake Risk of dead stretch Impact on the fauna Fluctuating water quality Low energy consumption 7 DTU Aqua, Technical University of Denmark

8 Water resource Application of Recirculation Technology Issues: Less water intake Less dependent on river water Less impact on the fauna 8 DTU Aqua, Technical University of Denmark

9 Water resource Re-use / Recycling of water Filter for denitrification 5 Submerged Biological Filter 4 6 Trickling Filter 1 Water from fish tanks Mechanical Filter 2 Oxygen Cone 10 Water to fish tanks 9 UV-Filter Water to fish tanks Pump Sump 1 Return pumps String 1 String 2 Pump Sump 2 7 Proppeller pumps Pressure pumps Bypass pipe for water equalising Recirculation degree (Re-use %) Recycling, i.e. % water exchange of vol/day (10-20 %) Overall intensive : l/s/kg feed 9 DTU Aqua, Technical University of Denmark

10 Environment Flow through system Sedimentation Issues: Sedimentation Var. water quality? Impact on the fauna? Outlet Constructed wetland 10 DTU Aqua, Technical University of Denmark

11 Environment Application of Recirculation Technology Sedimentation Lagoon Biofilter Constructed wetland 11 DTU Aqua, Technical University of Denmark

12 Environment Application of Recirculation Technology Issues: Less environmental impact Less impact on the fauna More stabile water quality Energy consuming (pumps) CO 2 emission Less area 12 DTU Aqua, Technical University of Denmark

13 Environment Recirculated Fish Rearing Technology Filter for denitrification 5 Submerged Biological Filter 4 6 Trickling Filter 1 Water from fish tanks Mechanical Filter 2 Oxygen Cone 10 Water to fish tanks 9 UV-Filter Water to fish tanks DTU Aqua, Technical University of Denmark 8 3 Pump Sump 1 Return pumps String 1 String 2 Pump Sump 2 7 Proppeller pumps Bypass pipe for water equalising Pressure pumps Regulation and control of the internal environment (stability) Reducing invasive fish diseases from surroundings Improved working conditions Risc of accumulation of NH 3, NO 2, CO 2 Management / Back up

14 THANK YOU FOR YOUR ATTENTION