RAS system

RAS system technology

To maintain high water quality, levels of certain substances must be controlled. They include oxygen, ammonia, nitrite, nitrate, carbon dioxide, hydrogen sulfide, salinity, and solid wastes.

The majority of these toxic substances are products of decomposition of solid waste. Removing solid waste is as important as possible. Good mechanical filters can remove this waste.

After removing the solid waste, it is the biological filter’s turn to process the ammonia and nitrite, converting them to nitrate, which is much less toxic. Then carbon dioxide is removed via gas extrusion. Natural aeration devices are also used to add oxygen to fish tanks and a biological filter.

The water is sterilized to remove pathogens. The sterilization process uses ozone and ultraviolet light systems to eliminate biological pathogens.

Here the water is fed with condensed oxygen and returned to the fish tanks pure and saturated with oxygen.

There are two types of filters: mechanical and biological.

Filters for Settled Solids Filters for Suspended Solids

These are particles that can be filtered by gravity. The process typically involves using radial filters as a first step, followed by cylindrical drum filters with fine pores for the secondary filtration.

Smaller and lighter particles that pass through mechanical filters are processed and removed using other media. These include protein skimmers, foam filters, and brush filters. These filters are capable of isolating suspended particles from the water and then removing them from the system.

Biological filters are plastic filters that host beneficial bacteria to treat dissolved toxic substances in the water. The number of bacteria increases with the surface area of the bio-media and the availability of oxygen, which positively impacts the filter’s ability to convert toxic ammonia into nitrate.

Fish and beneficial bacteria require a significant amount of oxygen to thrive. In intensive aquaculture, large fish, in particular, can deplete the dissolved oxygen in the water, leading to suffocation and death if not adequately addressed. Therefore, continuous oxygenation in the tanks is crucial for the health and survival of the fish. The efficiency of the aeration systems directly impacts the production density and overall system performance.

A crucial stage to ensure control over pathogens and harmful bacteria. There are two types of sterilization processes: ozone and ultraviolet (UV) light.
جميع الحقوق محفوظة 2024
تصميم و استضافة: الابداع الرقمي