Alvestad Marin AS

- Highly Efficient CO2aerator


GasBuster is a new a highly efficient CO2aerator. It has been designed with counter flow aeration air and water runs the opposite way in the aeration chamber and it is possible to control the quantity of air relative to water. A patented cleaning system safeguards that the aeration medium in the unit always is clean. Therefore, GasBuster always achieves constantly high cleaning efficiency.

High cleaning efficiency relative to CO2 is more important than one should believe if the goal is to achieve high production capacity in fish farming. As an illustrative example, you will, in a tank with a volume of 500 m3, be able to introduce about 100 000 more 100 gram fish at 12oC if the cleaning efficiency of the CO2 aerator is increased from 50% to 75%.

This means that in practice, that by investing in a highly efficient aerator, you may increase the capacity in the facility quite a lot – thus a profitable  investment! When you plan increased capacity in the facility by means of CO2 aeration, it is of vital importance the water treatment technology works with uniform efficiency all the time. If the cleaning effect is reduced as a consequence of fouling for example due to high temperatures, you will lose capacity when you need it the most. A built-in, patented cleaning system in GasBuster safeguards that the aerator always is equally efficient.This is the most important property of this CO2 aerator.

The photo below shows two different models of GasBuster® high and low edition. With the high edition, the water is pumped from the tank into the top of the aerator chamber and flows back to the tank by means of gravity. In the low edition, the water is added by means of gravity from the fish farming tank and is then pumped back after treatment. We offer assistance with solutions for installation, including dimensioning and design of piping to/from GasBuster® and into the tank in order to achieve good water flow (hydraulic) in the tank. The correct flow rate and flow through are important assumptions in order to achieve good water environment in fish farming tanks.

GasBuster is made from polyethylene (PE) and is therefore robust, has a long service life as well as being resistant to chemicals and corrosion. The unit is easy to clean and to disinfect. All the GasBuster models are tested with water and are quality assured before dispatch.

Each GasBuster is equipped with a process control system placed in a control cabinet for installation outdoors. In the front of the control cabinet, there is an operator panel for easy control. A PLC governs and checks the water pumps, the water level, the fan and the cleaning system. We offer technology for remote connection to the aerator’s control cabinet. This provides immediate assistance in case of operation disturbances, and SMS alarm transmitter as well as the opportunity of installing 24 hour onlin a service. The control system has been FAT tested and checked before delivery.

Each GasBuster®are equipped with a process control system mounted inside a high quality cabinet made of stainless steel. All units inside will handle a wide temperature range and the cabinet are rated with a IP65 grade to handle harsh enviroment

The main unit of the control system is a PLC. This PLC controls the waterpump(s), valve(s), fan, water level and cleaning functionality.

If selected, a touch panel can be installed in the front of the cabinet to give the operator information and the possibility to adjust setting, check alarmlist and trend curves. One operating panel can handle several GasBuster® control systems.

The control system provides automatically cleaning of the media. The water flow will be controlled to reach a selected level before the high pressure flushing will be activated to start the cleaning process of the media.

We can offer the possibility to have remote access to the control cabinet. This will make it possible to give remote diagnosis and support.

As an option, the system also can have an SMS alarm sender. All PLC units are type approved by DNV to ensure the best possible reliability.

The control system supports data exchange of alarms and information to all known superior control systems on the market.

We have carried out an assessment of the economic consequences of investing in CO2aerators with high cleaning effect compared to aerators with lower cleaning effect.

The assessment shows that in a 350 m3 tank, an increase in the cleaning effect from 50 – 60% up to 75 – 80% may provide a potential growth in turnover of about 1 million NOK per year provided certain assumptions. This assumes that the technology provides stable, high effect.

Investment in efficient and stable aerator technology is the fastest way to increase the production capacity in a smolt facility. Even if the assessment in this memo mentions salmon particularly, the assessment will also be valid for salmonides in general.

Efficient stripping of CO2 provides a great potential for increased production capacity in the production of hatchery-produced fish for stocking. It is decisive that the technology provides high cleaning effect.

Simultaneously, it is also very important that the technology has a stable and predictable effect in order to exploit the potential. With a facility which uses added oxygen in combination with CO2 stripping we have made an assessment of the potential by use of this water treatment strategy.

In other words: How low water consumption may be achieved in a defensible manner with such solutions?

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