Page 65 - fish_farms_curriculum

The light intensity of the lamps of the UV filters is important for the efficiency of the filter.

There are filters with a UV dose of 360-400 Joules/m² in the market. However, the important
thing here is that it reaches these values after 9000 hours of operation. The effect of the UV

dose applied per square meter is also related to the water flow rate. The UV dose applied at

low and high flow rates will also change.

Although some experts talk about the redundancy of the UV filter in the geothermal system, it

is recommended to use the UV filter in commercial and intensive productions in order to

protect the health of the fish.

6.5. Aeration

It is the equipment to provide the necessary oxygen during nitrification in the geothermal

system, in the fish tank water and in the biological filter . It is a system in which atmospheric
air is transported by pressure and thin air pipes and air stones are used to dissolve the air in

water faster. Compressors can be used for this process, but an important point to note is that

there should be an oil and water trap at the air outlet of the compressors and a good air filter at
the air inlets. Compressed air must be transported to tanks with a suitable piping system and

the amount of air must be adjusted with air valves.

Picture 26. Compressor and aquarium air motor

To increase the water oxygenation, an air stone should be placed at the end of the air hoses.
The smaller the pores on the air stones, the smaller and more the air bubbles will be, so the

solubility of oxygen from the air in water will increase.

For small scale amateur geothermal systems, suitable size aquarium air motors may be

sufficient.

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