Pure Aqua Forced Draft Degasifiers removes unwanted gases from supply water

The degasifier removes gases by transient the water over a packing media that allows the water to form a thin film over the entire surface area. The counter current airflow is introduced at the bottom of the tower and travels up the stack through the descending flow of water. The gases are stripped as the air go over the surface of the water.
Pure Aqua Forced Draft Degasifiers are used to remove unwanted gases from supply water. Pure Aqua standard FDD range covers flowrates from 75GPM to 1000GPM.

PROCESS ON HOW TO REMOVE GASES FROM WATER

Water normally contains free oxygen, carbon dioxide, nitrogen and other dissolved gases. And some of those gases can be corrosive and they can negatively affect various chemical processes, so it is very important to remove those gases from water.
There are several ways for removing gases from water, and some of those systems are as follows:
1. Air stripping in suitable plants where flows inside a column filled with dispersing rings encountering an air stream.
2. Chemical dosing system, chemical additives often quite expensive which form chemical compounds not always welcomed.
3. Increase water temperature more than 80° C to strip away dissolved gases. This system requires high energy cost. In case of recovery of condensated water heat is mainly given by condensated water itself but there is anyway loss of heat due to hot air or vapor discharged by the chimney.


Degasifiers are used in demineralizer applications to strip CO2 following a strong acid cation exchanger or softening application. They can also be used as an economical way to remove hydrogen sulfide or volatile organic compounds (VOC). Degasifiers are sized based on the water service flow rate.

SIZING THE SYSTEM
The forced aeration of water will obtain oxidized matter from the fluid and remove gases such as methane (CH4) carbon dioxide (CO2) and hydrogen sulphide (H2S). The total removal of the gases requires previous acidifying the fluid and the use of strong oxidizing agents such as chlorine or potasium permanganate. The raw water falls from the top of the tower onto a layer of filling elements of special shape. This is required in order to maximize the surface area with the forced upward draft. This result in the most thorough oxidation and removal of gases carried up through the tower and collected at the top.

OPERATION OF THE SYSTEM
Pure Aqua degasifiers are well proven as an efficient, reliable and cost-effective approach to reducing dissolved gas during the water treatment process. The units are comprised of a packed tower and integral sump with fan. The sump is sized to give approximately 2 minute retention time at maximum flow. Pure Aqua engineers its systems for compact and efficient design tailored to any custom application.


MAIN APPLICATIONS

1. Degasification for steam boilers feed so as to reduce free gases thus reducing drastically the need of expensive conditioning chemicals
2. Degasification for supercritical rinsing after ultrasonic cleaning in semiconductor industries
3. Degasification cells (EDI) for deionization with mixed bed resins in case of water quality needed lower than 1 microsiemens and up to 18 megaohm
4. Deaeration for production of fruits, juices and beverages in general
5. Deaeration of process water when there is need of very low levels of residual dissolved gas


Pure Aqua also supplies: Custom Engineered Solutions, Multimedia Pretreatment, Activated Carbon Pretreatment, Water Conditioning, Chemical Dosing Systems, Ultraviolet (UV) Sterilizers and Ozonation Systems.
For more information about Pure Aqua degasifiers, please visit our website: www.pureaqua.com.