Recirculating aquaculture system (RAS)

Recirculating Aquaculture System, English: Recirculating Aquaculture Systems, referred to as RAS, is a new type of farming model, through a series of water treatment units to treat the wastewater generated in the breeding pond and then recycle it.

The main principle of RAS is to integrate advanced technologies in environmental engineering, civil engineering, modern biology, electronic information and other disciplines to remove residual bait feces, ammonia nitrogen (TAN), nitrite nitrogen (NO2--N) in aquaculture water. For the purpose of purifying the breeding environment, the purified water is reintroduced into the breeding pond by physical filtration, biological filtration, removal of CO2, disinfection, oxygenation, temperature adjustment and other treatments. It can not only solve the problem of low utilization rate of water resources, but also provide a stable, reliable, comfortable and high-quality living environment for breeding organisms, and provide favorable conditions for high-density farming.

2. Process flow chart of recirculating aquaculture system (RAS)

3. Main equipment of intelligent recirculating aquaculture system (RAS)

1. Physical filtration

Drum Microfilter

2. Biological filter

3. Ultraviolet sterilization device

4. Process flow of intelligent circulating aquaculture system (RAS)

1 drum filter

The intelligent rotary drum microfiltration machine uses the filter screen as the medium, directly filters and removes the tiny solids in the water through mechanical and physical filtration, and quickly, massively and effectively filters out the residual bait, feces and organic particles in the water. It can cooperate with Other equipment completes a series of treatment processes such as filtration, disinfection, sterilization, and oxygenation of circulating water. The microfiltration machine is mainly composed of a microfiltration machine body, a flushing pump, a pipeline filter, a microfiltration machine control box and a liquid level switch. Controlled by the control box, the liquid level switch detects the liquid level, the motor drives the drum to rotate, and the self-equipped high-pressure backwashing water pump cleans the mesh cloth, and the sewage is discharged through the sewage pipe. The cleaned mesh cloth can rotate circularly to achieve water filtration.

widely applicable

§ Industrialized recirculating aquaculture water treatment

§ Pretreatment of raw water from domestic drinking water plants

§ Industrial water treatment

§ Domestic water pretreatment and final treatment

§ Recycling of useful substances in industrial wastewater, etc.

Automatic water level monitoring

Equipped with an automatic water level monitoring device, according to the setting of the system, the microfiltration machine is automatically controlled throughout the whole process to work automatically without manual supervision.

  Frequency Control

The system comes with an on-site status alarm, and through frequency conversion control, it can effectively protect the motor when the drum motor is in an abnormal state, prolonging the service life of the motor.

backwashing device

The microfilter automatically backwashes according to the system settings, and cooperates with the special sewage tank. The whole system saves water and electricity, and is easy to clean.

brand new design

New design, small footprint, easy installation, large effective filtration area, high reliability

Alarm and remote communication

It has a fault alarm function, and has a network interface, and has remote communication and Internet of Things functions.

Ektec Environment is a leading brand of aquaculture intelligent equipment, your trusted aquaculture partner

2. Biological filter

After being treated by the protein skimmer, some molecular pollutants (TAN, NO2--N, organic matter, etc.) that are harmful to the culture still exist in the water. The biofilter is mainly to convert most of the pollutants (TAN, NO2--N, organic matter, etc.) thing. It mainly relies on the biological oxidation and biological flocculation of microbial groups (inoculated with nitrifying bacteria, etc.), the adsorption and interception of fillers, and the hierarchical predation of food chains in microbial ecosystems, etc., to efficiently remove ammonia nitrogen, organic matter and SS in sewage.

Since some algae and nitrifying bacteria that remove ammonia nitrogen are aerobic organisms, the bottom of the biofilter is equipped with an aeration device. The water treated by the biological filter enters the ultraviolet sterilizing device.

5. Ultraviolet sterilization device

Due to the participation of some biological treatment units in the industrial circulating aquaculture system (RAS), some bacteria, pathogenic bacteria, parasites, etc. are easy to grow and reproduce. If the treatment is not timely, it will easily cause fish diseases and cause aquaculture Production brings losses, and the injection of some chemicals can also affect the entire circulatory system. Ultraviolet lamp disinfection technology is a kind of sterilization and disinfection technology that is widely used at present. It mainly acts on microbial nucleic acid, deoxyribonucleic acid (DNA), ribonucleic acid (RNA), etc., resulting in its destruction, and also has a certain force on proteins.

 

The ultraviolet disinfection light box series products produced by Zhejiang Aike Titanium Environmental Technology Co., Ltd. adopt a new type of ballast developed by ourselves, which has a long service life, low lamp loss, and unlimited length of connecting wires. Wide surface area, no side effects, etc., pure quartz lamps have high purple transmission rate, low decay rate, and long life.

The UV light box of Zhejiang Aiketi Environmental Technology Co., Ltd. has the following advantages:

● Newly designed voltage type ballast, compared with the current type ballast sold in the market, the preheating power of the voltage type ballast is higher, which effectively prolongs the life of the lamp tube.

● Newly designed and developed electronic ballast, the power factor can reach 0.998, and the power grid has little pollution.

● The crest factor of the working current of the UV lamp is 1.47, which is far lower than the requirement of no higher than 1.7 in the international standard.

● The matching between the UV lamp and the ballast is good, and the service life of the lamp tube is twice that of the UV lamps sold in the market.

After passing through the ultraviolet sterilizing device, more than 90% of bacteria and pathogenic bacteria are killed.