External Organisations

  • Danish Aquaculture Organization, Denmark
  • AquaCircle, Denmark
  • Lokalenergi A/S, Denmark
  • BioMar, Denmark
  • Danish Technological Institute, Denmark
  • Nielsen Consult, Denmark

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The increased implementation of technologies for water recirculation and the purification, oxygenation and degassing of water used in aquaculture production, has caused the energy costs associated with fish production to dramatically increase. The current energy consumption for the production of 1 kilogram of rainbow trout is estimated at 1.7 kWh. This represents a challenge for the aquaculture industry because national and international ambitions strive for a general decrease in carbon dioxide emissions. The aim is to reduce the energy requirements for trout production to 1 kWh per kg. With an annual production of 35,000 tons, this corresponds to an annual reduction in CO2 emissions of 13,400 tons, and a financial saving of DDK 17.1 million. The purpose of the project is to identify the most energetically efficient methods to oxygenate, degas and move water, or how to improve the efficiency of currently used methods, without compromising water quality parameters. Currently, the primary method for aeration, degassing and water movement is by use of air, using the so-called air lift pumps aka mammoth pumps.

The project will collect data on annual energy consumption from 4-8 selected recirculating aquaculture facilities and compare these values with feed use and fish production. The energy consumption is considered with reference to the technologies in use at a given facility and the construction of the facility. The primary purpose is to evaluate energy efficiency of air blowers currently in use, air delivery per unit of effect, efficiency in aeration and degassing, and variations in the requirement for aeration and degassing over the daily cycle. These results will enable the documentation of any correlations between energy efficiency, technology in use, methods of operation, and will serve in the further development of alternative solutions to aeration and degassing. Emphasis will be on the physical properties and placement of air diffusers in airlift pumps and the feasibility of using trickle towers for aeration, aeration with liquid oxygen or other alternatives. Experiments to determine energy use and efficiency of alternate oxygenation and degassing devices will allow the project to determine whether more suitable technologies exist and make an estimate of potential energy savings.

The project will terminate in a final report and a workshop where the results will be presented to stakeholders in the aquaculture industry (fish farmers, feed manufacturers and equipment suppliers). Suitable alternative technologies and methods for aeration and degassing will be presented in practice.

The project is coordinated by Danish Aquaculture Association, Denmark.
StatusCompleted
Period01/01/1001/10/12

Keywords

  • Research area: Aquaculture - Rearing Systems and Environmental Effects
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ID: 2288748