What is aeration?
The process of aeration is used to mix, circulate, or dissolve air into a liquid or another substance. Mechanical aeration reduces the amount of chemicals needed to treat a body of water by providing the oxygen for bacteria to function properly. Mechanical aeration is the use of machines to mix air into water to enhance wastewater treatment.
Types of aeration
There are two types of water aeration viz. Sub-surface and surface.
Although subsurface aeration comes to mind initially in discussions of wastewater treatment but we must know that surface aeration plays an equally important role in oxygenating liquids and increasing oxygen concentration.
What is the Role of Surface Aeration in Wastewater Treatment?
Surface aerators push water into the air from the bottom of the water below or below the surface of water level, then the droplets fall back into the water, mixing in oxygen. The jets of water break the surface with varying degrees of force and aeration of water is achieved.
Types of Aerators
There are many types of surface aeration devices or aerators, including floating aerators. When aerator pumping rate is high, they can effectively mix liquids in water treatment lagoons and tanks. Often, these are low trajectory sprays, a feature that produces high oxygen transfer rates.
Other surface aeration devices include bubblers, fountains, and agitators.
1: Floating Aerator
Floating aerators can be used in applications such as wastewater treatment, leachate treatment, aeration, and sequencing batch reactors to release unwanted gases from the water.
2: Floating Paddle Wheel Aerator
Floating paddle wheel aerators are another type of surface aeration device. Their rotating blades produce horizontal mixing action and create a high oxygen transfer rate. They can be usedboth alone and in groups to create flow patterns in oxidation ditches, lagoons, or tanks.
Efficiency of Surface Aerators
How well surface aeration works depends on the amount of surface contact between air and water. Due to the surface of the device, this type of aerator is effective in introducing oxygen into the upper foot of the body of water, depending on the type of nozzle used.
Surface aeration applications
Aeration is required in a variety of industrial applications such as food processing, petrochemicals and pulp and paper mills. It is also commonly used for the treatment of agricultural waste.
The surface aerators can also be used to circulate stagnant water and keep it healthy and odourless. Water used in golf courses or in public parks are a good example. These decorative water features and aquaculture ponds have specific needs to keep fish and plants healthy.
Factors such as rising temperature can prove challenging to surface aeration because of higher rates of evaporation, which may have adverse effect on some applications.
Aeration is thus an important parameter of water and wastewater treatment unit and its challenges are different from other units of the system. They have a significant use in the treatment plant to mix oxygen and control dissolved oxygen levels in the plant.
How can Netsol Water help?
Many aeration technologies are currently available in the market, and each is designed to address a specific challenge or range of challenges.
We are India’s leading water and wastewater treatment solution company which covers all the needs of any water treatment scheme on all levels. We have the expertise to provide wastewater solutions at domestic, industrial and municipal levels including various Aeration devices.