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- Категория: Aquaculture Equipment >>>
- Поставщик: Zhongshan,Ewater,Aquaculture,Equipment,Technology,Limited
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Описание и отзывы
Трекер стоимости
| Месяц | Минимальная цена | Макс. стоимость |
|---|---|---|
| Sep-18-2025 | 0.60 $* | 0.31 $* |
| Aug-18-2025 | 0.89 $* | 0.66 $* |
| Jul-18-2025 | 0.78 $* | 0.30 $* |
| Jun-18-2025 | 0.49 $* | 0.71 $* |
| May-18-2025 | 0.78 $* | 0.93 $* |
| Apr-18-2025 | 0.94 $* | 0.36 $* |
| Mar-18-2025 | 0.21 $* | 0.83 $* |
| Feb-18-2025 | 0.47 $* | 0.62 $* |
| Jan-18-2025 | 0.69 $* | 0.33 $* |
Характеристики
RAS Description
RAS are used in home aquaria and for fish production where water exchange is limited and the use of biofiltration is required to reduce ammonia toxicity. Other types of filtration and environmental control are often also necessary to maintain clean water and provide a suitable habitat for fish. The main benefit of RAS is the ability to reduce the need for fresh, clean water while still maintaining a healthy environment for fish. RAS have high fish stocking densities and can be operated economically commercial.All our eWater researchers are currently conducting studies in RAS and we have many successful indoor fish farming projects all over the world.
A series of treatment processes is utilized to maintain water quality in intensive fish farming operations. These steps are often done in order or sometimes in tandem. After leaving the vessel holding fish the water is first treated for solids before entering a biofilter to convert ammonia, next degassing and oxygenation occur, often followed by heating/cooling and sterilization. Each of these processes can be completed by using a variety of different methods and equipment, but regardless all must take place to ensure a healthy environment that maximizes fish growth and health.
Process | Equipment necessary |
Biolfiltration | denitrifying biofilter,MBBR process |
Solids removal | drum filter, sand filter, protein skimmer |
Reoxgenating | oxygen cone or low pressure oxygenating device |
PH control | degassing device |
Temperature control | submerged heaters, heat pumps, chillers, and heat exchangers |
Biosecurity | UV sterilizer ,ozone generator |
Biofiltration
All RAS relies on biofiltration to convert ammonia (NH4+ and NH3) excreted by the fish into nitrate.
Nitrifying bacteria are chemoautotrophs that convert ammonia into nitrite then nitrate. A biofilter provides a substrate for the bacterial community, which results in thick biofilm growing within the filter.Water is pumped through the filter, and ammonia is utilized by the bacteria for energy. Nitrate is less toxic than ammonia (>100 mg/L), and can be removed by a denitrifying biofilter or by water replacement.
Solids Removal
In addition to treating the liquid waste excreted by fish the solid waste must also be treated, this is done by concentrating and flushing the solids out of the system. Removing solids reduces bacteria growth, oxygen demand, and the proliferation of disease.
Typical RAS solids removal involves a sand filter or particle filter. Another common method is the use of a mechanical drum filter In order to remove extremely fine particles or colloidal solids a protein fractionator may be used with or without the addition of ozone (O3).
PH Control
In all RAS pH must be carefully monitored and controlled. The first step of nitrification in the biofilter consumes alkalinity and lowers the pH of the system. Keeping the pH in a suitable range is crucial to maintain the health of both the fish and biofilter. pH is typically controlled by the addition of alkalinity in the form of lime (CaCO3) or sodium hydroxide (NaOH). pH can also be controlled by degassing CO2 in a packed column or with an aerator, this is necessary in intensive systems especially where oxygenation instead of aeration is used in tanks to maintain O2 levels.
Temperature control
All fish species have a preferred temperature above and below which that fish will experience negative health effects and eventually death. Temperature also plays an important role in dissolved oxygen (DO) concentrations, with higher water temperatures having lower values for DO saturation. Temperature is controlled through the use of submerged heaters, heat pumps, chillers, and heat exchangers.[13] All four may be used to keep a system operating at the optimal temperature for maximizing fish production.
Biosecurity
Disease outbreaks occur more readily when dealing with the high fish stocking densities typically employed in intensive RAS. Outbreaks ca n be reduced by operating multiple independent systems with the same building and isolating water to water contact between systems by cleaning equipment and personnel that move between systems. Also the use of a Ultra Violet (UV) or ozone water treatment system reduces the number of free floating virus and bacteria in the system water. These treatment systems reduce the disease loading that occurs on stressed fish and thus reduce the chance of an outbreak.
Details Images
Successful Cases
Pabda Catfish (Ompok Pabda)
● Culturing Cycle Time: 90 – 110 D to 40 - 55 grams size
for harvesting
● Biomass: 60 kilograms/m3 at harvesting
● Temp: 15 – 30 ℃, 22 – 27 ℃ preferred
American eel
● Culturing Cycle Time: 150D to 150 grams size from
50-gram fingerlings
● Biomass: 60 kilograms/m3 at harvesting
● Temp: 26-30℃
Advantages of RAS
▶Reduced water requirements as compared to raceway or pond aquaculture systems.
▶Reduced land needs due to the high stocking density.
▶Site selection flexibility and independence from a large, clean water source.
▶Reduction in wastewater effluent volume.
▶Increased biosecurity and ease in treating disease outbreaks.
▶Ability to closely monitor and control environmental conditions to maximize production efficiency. Similarly, independence from weather and variable environmental conditions.
Company Profile
Zhongshan eWater Aquaculture Equipment Technology Limited is a professional company engaged in design, production and sales of Recirculating Aquaculture System as well as aquaculture equipment.
Ewater is focused on the development and manufacturing of industrial recirculating aquaculture system solutions, and its product design and production, including drum filters, protein skimmers, biological filters, aeration equipment, disinfection equipment, heat pumps and water quality monitor equipment.
We work with top-level aquaculture research institutes and experts to develop best solutions for our customers in aquacultrure industry. Our engineering team is committed to develop best practices for each equipment and RAS based on customers' needs.
We continue to be reliable and honest in what we do and how we act.Our mission is to improve sustainability and profitability for customers, and be a valuable partner for customers' long-term business.
Certifications
Exhibition
Exhibition in Nanning City Guangxi Province，China
Exhibition in Zhanjiang City Guangdong Province，China
Installation Services
On-site installation services are available
Great Service is Our Misson
1. Warranty: 12 months since the shipping date, free maintenance provided. Cost of the spare parts should be paid beyond the warranty. The following conditions are not covered by the warranty.
a) Damaged due to accident or misuse.
b) Damaged by unauthorized dismantling or repairing without permission.
c) Appearance damage
d) Replace the spare parts with the unauthorized ones.
a) Damaged due to accident or misuse.
b) Damaged by unauthorized dismantling or repairing without permission.
c) Appearance damage
d) Replace the spare parts with the unauthorized ones.
2. For more spare parts (ozone tube, solenoid valve, air compressor, PCB) or any other needs for after-sales service please
contact us via email or phone.
On-site installation services in Uzbekistan
On-site installation services in Bangladesh
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