The drum filter can be found in many specific fields including aquaculture. It is mandatory for an open fish farm or in a recirculating system. A drum filter prevents the formation of algae or bacteria that can affect the living conditions of fish.
Drum filters for aquaculture
a. Why filter recirculated water (RAS)?
RAS purpose is to conduct fish farms in places where water is present in limited quantities. We will also have a better performance with :
- reduced energy consumption,
- a reduction in the risk of pathogen dissemination,
- direct control over water quality and therefore a better yield.
The filter action eliminates waste in the water and traps the sludge extracted from the system. This removal will cause the system to lose water, so an addition of water will have to compensate for it.
The biological filter placed just after the aquaculture drum filter will remove theOther toxic wastes such as nitrogen. A system with only an MBBR type biological filter will not be viable. Without mechanical filtration and particle removal, the particles will settle on the cheaps. Heterotrophic bacteria (carbon consumers) will grow faster than autotrophic bacteria (nitrogen purifiers)
b. Drum filter at the entrance and exit of a fish farm
The notion of entry and exit is found in an open network. Water is pumped from an external environment to supply the tank and ensure the well-being of the fish.
- The purpose of an inlet drum filter is to provide mechanical filtration of the water entering the pond. The water that arrives in the pond is “clean” and free of macroelements that could harm the fish.
- This equipment provides a high level of hygiene and avoids geosmines (muddy taste) in the fish flesh.
- Putting a filtering system at the exit of a fish farm is as essential as the one at the entrance. Indeed, if absent from the network, the pollutants produced by the fish (organic matter, nitrogen…) risk to contaminate the environment. They would result in eutrophication of the environment, which would lead to anoxia and an ecological disaster.
- For total effectiveness, it is recommended to add a biological filtration to the aquaculture drum filter to avoid contamination.
Drum filters for ponds
In nature, water sources are exposed to natural filtration. This occurs through many phenomena including infiltration into the soil, runoff along a river, evaporation and even infiltration. However, they are almost inexistent in an artificial pond. Moreover, we need to set up an artificial phenomenon to compensate for this.
There are many factors involved in choosing aquaculture drum filters for ponds. This can vary depending on the size of the ponds, the number of individuals but also the type of farming.
It is important to plan a pond size adapted to the number of individuals you have. Indeed, in order to provide quality and well-being, fish, mollusks and crustaceans need a sufficient living space. It is therefore important to define the species that you will integrate, in order to define the design of your pond.
Filters the water for Koi carp
Koi are rather fragile fish that require special care. We believes that a fish requires around two cubic meters to grow quickly. To design your pool and avoid wasting energy, it is necessary to take this parameter into account. The shape of your pond is also important for your drum filtration system. This prevents the formation of stagnant water that is not subject to mechanical filtration. It is preferable that the pond is not too deep, to easily observe your fish. However, it is important that the level does not exceed the height of the filter discharge chute in the gravity version.
In order to ensure the best mechanical filtration, the drum filter must have a capacity corresponding to your pond. To ensure its effectiveness, half the volume of the pond must pass through the filter every hour. For a 30 m³ pond < we recommend a filter capable of ensuring a flow of 15 m³ per hour.
- A 50 m³ pond requires a flow rate of 25 m³ per hour;
- For 80 m³, a flow rate of 40 m³ per hour is recommended;
- A flow rate of 60 m³ per hour is required for 120 m³;
- Finally, for a 160 m³ pond, we recommend a flow rate higher than 60 m³ per hour.
Drum filter for aquaponics
Aquaponics is a cultivation method that combines three types of living beings: bacteria, fish and plants. This mutual benefit relationship is expressed in the following way:
- Aerobic bacteria converts nitrogen waste such as ammonia produced by fish (urea)
- plants’ roots in suspension will then absorb them
- This way, they will be provided with access to the necessary nutrients while eliminating the waste products emitted by the fish.
However, although this system may appear self-sufficient, adding a drum filter can be beneficial. This is because the substrate and roots will tend to clog up due to water impurities. This will require additional and regular maintenance.
To prevent clogging, a suitable filtration method must be chosen to avoid :
- Any possibility of overheating the water in summer, the filtration system must be buried.
- Energy consumption, it would be better if it worked by gravity.
- The clogging should be slow enough to limit maintenance and easy to clean, while producing clear water.
- Although it allows the recovery of mud, it can also be used as fertilizer.
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