3.2.1. Fishfarm Water
3.2.1. Fishfarm WaterWith regard to using BIO-BLOK® products for biological treatment of fishfarm water, it has been proven that BIO-BLOK® 80 HD G in smooth version is extremely well suited in systems for aeration of fishfarm water.
The fields of application are all places where a free fall is available (minimum 20-30cm) or where the water is being lifted by a pump (e.g. by return pumping).
The conditions of a good result with use of BIO-BLOK® 80 HD G are simple as the best result is achieved by a good distribution of the water through the BIO-BLOK® products. In this way the water is "broken" most possible and the biggest possible contact to the oxygen of the air is achieved. At the same time, the gasses in the water, if any, are effectively aired.
The water can be spread over the BIO-BLOK® products through e.g. a perforated box of stainless steel, plastic or the like. Depending on the volume of water, the holes should be 4mm to 8mm in diameter at intervals of approx. 5cm between the holes. The box has to be constructed in such a way that it is possible to clean the holes as they in time will clog up.
Principle drawing of aeration/degassing of fishfarm water
|EXPO-NET's BIO-BLOK® 80 HD G for aeration of fish farm water has the following qualities:
BIO-BLOK® 80 HD G
|Type of filter media||
BIO-BLOK® 80 HD G
|Specific surface (m2/m3) (approx.)||
|Area of flow (approx.)||
|Percentage of hollow space (approx.)||
|Standard module form||
The surface measurements have been calculated by the producer. Alterations in process, material and structure may slightly change the figures above (by up to 10%)). Above filter media are available with densities of approx. 0.5 and 0.95.
BIO-BLOK® 80 HD G is available in heights (lengths of block tubes) from 45cm to 75cm.
Dimensioning of aeration plant with BIO-BLOK® 80 HD G
The dimensioning of an aeration plant depends on many factors. The most important are as follows:
* Content of oxygen in the inlet water
* Distribution of the water over the BIO-BLOK® products
* Temperature of water
* Fall height through the filter
Depending on above factors, it is possible to achieve an oxygen saturation in the water of approx. 90-95% with the following dimension criteria:
30-40 l/sec. x 1 m3 BIO-BLOK® 80 HD G
20 l/sec. per m2 BIO-BLOK® 80 HD G in 54cms' thickness