Water Enters from the Top
RAS water is pumped to the top distribution system and evenly sprayed over the packing media.
Aquaculture Degassing Tower
Aquaculture Degassing Towers for RAS CO₂ Removal
PP degassing towers designed for dissolved carbon dioxide removal and dissolved gas management in recirculating aquaculture systems.
- 30–300 m³/h flow range
- Efficient CO₂ removal
- PP construction
Overview
What Is an Aquaculture Degassing Tower?
An aquaculture degassing tower, also called a CO₂ stripping tower or gas stripping tower, is a water-treatment device used in recirculating aquaculture systems to remove dissolved gases from circulating water.
Water is distributed over packing media inside the tower, creating thin water films and increasing the gas-water contact area. Dissolved gases such as carbon dioxide transfer from the water into the gas phase and are continuously removed through the tower's gas extraction system.
In commercial RAS, degassing is commonly used as part of the water-treatment process before treated water returns to the culture tanks.
How It Works
How Does a Degassing Tower Work?
YUTANK degassing towers combine water distribution, packing media, and continuous gas extraction to promote the removal of dissolved gases from circulating RAS water.
Water Flows Across the Packing
The packing media spreads the water into thin films and small streams, increasing the gas-water interface and creating more opportunity for dissolved gases to leave the water.
Gas Is Continuously Extracted
A gas extraction system at the top of the tower continuously removes released gases from the internal gas space. Natural air exchange through the air inlet helps maintain gas movement through the tower.
Dissolved Gases Leave the Water
As water moves across the packing media, dissolved gases such as carbon dioxide transfer from the water into the gas phase and are then carried out through the extraction system. Degassed water exits from the lower section of the tower.
Water Distribution + Packing Media + Gas Extraction → Increased Gas Transfer → Dissolved Gas Removal
Removal Targets
What Does a Degassing Tower Remove?
Dissolved Carbon Dioxide
CO₂ is the primary design target for most RAS degassing applications. Carbon dioxide can accumulate in recirculating systems as a result of fish respiration and biological activity. The degassing process promotes the transfer of dissolved CO₂ from the water into the gas phase, where it can be continuously extracted from the tower.
Hydrogen Sulfide
The degassing process can also help remove dissolved hydrogen sulfide where it is present in the water.
Excess Dissolved Nitrogen
Depending on system conditions, degassing can also contribute to the removal of excess dissolved nitrogen.
Other Volatile Dissolved Gases
Other unwanted dissolved gases may also transfer from the water into the gas phase where their physical properties and operating conditions allow, and can then be removed through the tower's gas extraction system.
Why It Matters
Why Is CO₂ Removal Important in RAS?
In high-density recirculating aquaculture systems, carbon dioxide can accumulate as a result of fish respiration and biological treatment. Excess dissolved CO₂ can affect water chemistry, fish respiration conditions and the overall efficiency of gas management in a RAS.
Supports CO₂ Control
Degassing helps reduce the accumulation of dissolved carbon dioxide in recirculating water.
Supports Stable Water Chemistry
CO₂ removal can support more stable carbonate and pH management within the aquaculture system.
Supports Downstream Oxygenation
Reducing the dissolved gas load can improve overall gas-management efficiency before water enters downstream oxygenation stages.
Supports High-Density Operation
As biomass and respiration load increase, effective gas management becomes increasingly important to maintaining stable system conditions.
Advantages
Key Advantages of YUTANK Aquaculture Degassing Towers
Continuous Gas Extraction
The gas extraction system continuously removes released gases from the tower, helping maintain the conditions required for efficient dissolved gas removal.
High-Surface-Area Packing
Packing media spreads the water into thin films and small streams, increasing the gas-water interface and promoting more efficient gas transfer as water moves through the tower.
Corrosion-Resistant PP Construction
The tower body is manufactured from PP polypropylene for aquaculture environments including freshwater, brackish water and seawater.
30–300 m³/h Standard Models
Six standard flow capacities provide options for different commercial RAS treatment requirements.
Low-Power Gas Extraction
Standard models use centrifugal blowers rated from 1.5 to 2.2 kW, depending on model size, to continuously extract released gases from the tower.
Designed for Continuous RAS Operation
The tower is designed for integration into continuously circulating aquaculture water-treatment systems.
Specifications
Aquaculture Degassing Tower Models & Specifications
YUTANK offers six standard PP degassing tower models covering nominal treatment flow rates from 30 to 300 m³/h.
| Model | Flow Rate | Size | Air Inlet | Air Outlet | Blower Power | Water Inlet | Water Outlet |
|---|---|---|---|---|---|---|---|
| 30T | 30 m³/h | Ø800 × H3050 mm | 110 mm | 160 mm | 1.5 kW | 110 mm | 110 mm |
| 60T | 60 m³/h | Ø950 × H3050 mm | 110 mm | 160 mm | 1.5 kW | 110 mm | 160 mm |
| 100T | 100 m³/h | Ø1200 × H3050 mm | 160 mm | 160 mm | 1.5 kW | 160 mm | 160 mm |
| 150T | 150 m³/h | Ø1500 × H3050 mm | 200 mm | 160 mm | 2.2 kW | 160 mm | 200 mm |
| 200T | 200 m³/h | Ø1800 × H3050 mm | 200 mm | 160 mm | 2.2 kW | 200 mm | 200 mm |
| 300T | 300 m³/h | Ø2100 × H3050 mm | 200 mm | 160 mm | 2.2 kW | 200 mm | 250 mm |
General Technical Configuration
- PP polypropylene tower body
- Internal packing media
- Top water-distribution system
- Centrifugal blower
- Air inlet and exhaust outlet
- Water inlet and outlet connections
Additional capacities and configurations may be available according to project requirements.
Request Technical Specifications →
Selection Guide
How to Choose the Right Degassing Tower for Your RAS
Degassing tower sizing should not be based on total RAS water volume alone. The following factors should be evaluated together:
- System Flow Rate — The water flow assigned to the degassing stage provides a starting point for model selection.
- CO₂ Load — The actual dissolved CO₂ load determines how much gas-transfer capacity is required.
- Biomass — Higher biomass generally increases respiration load and the amount of CO₂ generated in the culture system.
- Species — Different cultured species and production systems can have different gas-management requirements.
- Feed Load — Feed input influences biological activity, biomass production and overall system gas load.
- Water Temperature — Water temperature affects both fish metabolism and dissolved-gas behavior.
- Target CO₂ Level — The desired outlet CO₂ level should be considered together with the inlet concentration and treatment flow.
For this reason, the selected degassing tower should be evaluated as part of the complete RAS water-treatment process, rather than selected only from total system water volume.
RAS Integration
Where Does a Degassing Tower Fit in a RAS?
A degassing tower is typically integrated into the recirculating water-treatment loop where dissolved gas removal is required before water returns to the culture tanks.
A typical system configuration may include:
Fish Tank → Mechanical Filtration → Biofiltration → Degassing Tower → Oxygenation → Disinfection → Return Water
The exact equipment sequence depends on the hydraulic design and overall RAS treatment process.
Degassing removes unwanted dissolved gases, while oxygenation adds oxygen to the water. The two processes are often complementary in intensive RAS applications.
Applications
Aquaculture Degassing Tower Applications
Commercial RAS
CO₂ and dissolved-gas control in intensive recirculating fish farming systems.
Freshwater Fish Farming
Degassing for commercial freshwater RAS where respiration and biological activity can cause dissolved CO₂ to accumulate.
Marine Aquaculture
PP tower construction for marine and seawater recirculating aquaculture applications.
Hatcheries & Nursery Systems
Gas management for broodstock, fry, fingerling and juvenile production systems.
Shrimp & Crustacean RAS
Dissolved-gas management in intensive recirculating shrimp and crustacean culture systems.
Seafood Holding Systems
Water-treatment support for live seafood holding and temporary culture systems.
Installation
Degassing Tower Installation & RAS Integration
Degassing tower installation should be coordinated with the system flow rate, hydraulic layout, gas-extraction connection, water-distribution system, exhaust routing and maintenance requirements.
Level Foundation
Install the tower vertically on a stable, level foundation or steel platform.
Packing Media Installation
Packing media should be evenly installed to the required design height to maintain consistent gas-transfer performance.
Water Distribution
The top spray or distribution system should spread incoming water evenly across the packing media. Uneven distribution can reduce the effective gas-water interface and lower degassing performance.
Gas Extraction Connection
The centrifugal blower should be securely connected to the tower's gas extraction outlet and installed according to the required extraction direction.
Air Inlet and Exhaust Routing
Keep the natural air inlet unobstructed so air can enter the tower as designed. The extracted gas outlet should be routed to a well-ventilated outdoor location so discharged gases do not accumulate indoors.
Maintenance Access
Allow adequate clearance for inspection, cleaning and packing-media maintenance.
- At least 40 cm around the tower
- At least 60 cm above the tower
Projects
Degassing Tower Project Application
The right-hand vessel in this photograph is a degassing tower at the Japan eel RAS project. Explore the site installation and equipment configuration.
240 m³ Eel RAS Project
Japan
- Species
- Eel
- System Water Volume
- 240 m³
- Culture Tanks
- 11
- Culture Tank Size
- Ø6 m × 1.5 m (3 tanks); Ø4 m × 1.5 m (8 tanks)
Project Equipment
- Degassing Towers: 2
Why YUTANK
Why Choose YUTANK as Your Degassing Tower Manufacturer?
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01
Degassing Tower + Complete RAS Engineering
YUTANK selects degassing equipment as part of the complete RAS water-treatment process rather than treating the tower as an isolated component.
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02
30–300 m³/h Product Range
Six standard models cover a range of commercial aquaculture flow requirements.
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03
Project-Specific Sizing
Model selection can consider treatment flow, biomass, CO₂ load, species, feed input, water temperature and target treatment conditions.
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04
Installation & Commissioning Support
YUTANK can support equipment selection, system integration, installation guidance and commissioning according to project scope.
FAQ
FAQ About Aquaculture Degassing Towers
01 What is a degassing tower in aquaculture?
An aquaculture degassing tower is a water-treatment device used to remove dissolved gases from recirculating aquaculture water. Water is distributed over packing media to form thin films and increase the gas-water interface, while released gases are continuously extracted from the tower.
02 How does a degassing tower remove CO₂?
A degassing tower increases the gas-water interface by spreading water into thin films and small streams across the packing media. Dissolved CO₂ transfers from the water into the gas phase and is continuously removed through the tower's gas extraction system.
03 What gases can a degassing tower remove?
CO₂ is the primary target in most RAS degassing applications. Depending on the operating conditions, the stripping process can also support removal of gases such as hydrogen sulfide and excess dissolved nitrogen.
04 Where should a degassing tower be installed in a RAS?
A degassing tower is generally installed in the recirculation loop where dissolved-gas removal is required, commonly after mechanical and biological treatment and before water returns to the culture tanks. The exact position depends on the system’s hydraulic design and treatment sequence.
05 How do I size a degassing tower for aquaculture?
Sizing should consider treatment flow, CO₂ load, biomass, species, feed input, water temperature and target CO₂ level. Model selection should not be based on total RAS water volume alone. YUTANK can assist with project-specific sizing.
06 What is the difference between a degassing tower and an oxygenation system?
A degassing tower removes unwanted dissolved gases from the water, while an oxygenation system adds oxygen to the water. The two processes are often complementary in intensive RAS applications.
07 Can a degassing tower be used in seawater?
Yes. YUTANK degassing towers use PP polypropylene construction, which is suitable for freshwater, brackish water and seawater aquaculture environments.
08 How much does an aquaculture degassing tower cost?
The cost depends on the model, flow capacity and any project-specific requirements. Contact YUTANK with your system requirements to receive a technical recommendation and a specific quotation. Request a Degassing Tower Quote →
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Equipment: Degassing Tower