Recirculating Aquaculture System
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Zhongshan eWater Aquaculture Equipment Technology Limited conforms to the development trend of the industry, integrates internal superior resources, adopts the industry's cutting-edge manufacturing technology and production technology, and successfully creates RAS system indoor fish farming aquaculture equipment for Golda /Giant freshwater prawn / Macrobrach with excellent performance and reliable quality. And precisely because of the clear core selling point of RAS system indoor fish farming aquaculture equipment for Golda /Giant freshwater prawn / Macrobrach, not only does the product have a high reputation among customers, but also allows the product to have a high degree of intimacy among customers. For the growth and development of our company, Zhongshan eWater Aquaculture Equipment Technology Limited will never stop upgrading and developing technologies to enhance our core competitiveness. Our vision is to become a famous enterprise in the global market.

Place of Origin:Guangdong, ChinaBrand Name:eWater, eWater
Model Number:EW-RASProduct name:RAS system indoor fish farming aquaculture equipment
Water Volume:60m3/100m3/200m3/300m3 and moreFish Species:Tilapia/Catfish/Sturgeon/Shrimp/Seabass and more
Water:Fresh water or salt waterApplication:Indoor Fish Farming water treatment
Main Equipment:Drum Filter/Protein Skimmer/Biofilter/Degassing and moreCustomize Available:Solution for all kinds of fish species and capacity
Factory Visit:AvailableUse:Indoor Aquaculture Fish Farming


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.

Main eWater RAS processes and the equipment necessary

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
Equipmentnecessary
Biolfiltration
denitrifyingbiofilter,MBBRprocess
Solidsremoval
drumfilter,sandfilter,proteinskimmer
Reoxgenating
oxygenconeorlowpressureoxygenatingdevice
PHcontroldegassingdeviceTemperaturecontrolsubmergedheaters,heatpumps,chillers,andheatexchangersBiosecurityUVsterilizer,ozonegenerator
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
RAS Application

Applications

The RAS is a high density indoor aquaculture system and the fish species of eWater RAS successful applications including the Mandarin fish, Spotted bass, Turbot Fish, Lobster,Vannamei, King grouper,Tilapia and so on.


Successful Cases


Bagda(Tiger Shrimp)


● Culturing Cycle Time: 90D to 55 - 65 grams size for harvesting

● Biomass: 10 kilograms/m3 at harvesting  
● Temp:20 – 30 ℃, 26 – 30 ℃ preferred

Shing (Stinging Catfish)

Heteropneustes Fossilis

● Culturing Cycle Time: 140 -160D to 65 - 80 grams size for harvesting
● Biomass: 80 kilograms/m3 at harvesting
● Temp: 20 – 30℃, 23 – 28℃ preferred

Kio (Climbing Perch)

● Culturing Cycle Time: 150 D to 250 grams size for 

harvesting
● Biomass: 100 kilograms/m3 at harvesting
● Temp: 25 -30℃

Anguilla Anguilla

● Culturing Cycle Time: 150D to 150 grams size from

50-gram fingerlings

● Biomass: 60 kilograms/m3 at harvesting
● Temp: 26-30℃

RAS used to grow Pabda in Bangladesh

Farming cycle time: 120 days (fingerlings to 80 grams for
harvesting)
Biomass ( stock density): 80 kg /m ³
RAS water volume: 285 m³
RAS water flow: 240 m³/hour

RAS used to grow Tilapia in Jordan

Three tanks for grow-out and one tank for harvesting
Water volume: 1182 m³
12 small tanks for fingerlings nursery, each tank 36m³
Biomass(stock density) at harvesting : 100 kg /m³
RAS water flow: 1000 m³ /hour

About eWater

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
We also provide on-site installation services for our customers.

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
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.



Uzbekistan Carp Hatchery RAS system project

Bangladesh Shing Grow-out RAS system project


Customer Photos

You are welcome to visit our factory.
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Our mission is to improve sustainability and profitability for customers, and be a valuable partner for customers’ long-term business.

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They are all manufactured according to the strictest international standards. Our products have received favor from both domestic and foreign markets.
They are now widely exporting to 200 countries.

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