Aeration is the process of combining water and air to remove dissolved gases, and oxidize dissolved metals like iron, hydrogen sulfide, and volatile organic compounds (VOCs). This occurs during the secondary treatment procedures of activated sludge treatment, in wastewater treatment facilities and is frequently the first significant step, at a drinking water treatment facility.
For optimal wastewater treatment and microbiological development, an aeration system with an appropriately distributed oxygen supply is required. Amount of surface contact between water and the air, determines its efficacy of aeration.
Cascade Aerators are commonly used in water treatment. Cascade Aerators introduce air into a flowing stream of water, to oxidize iron and reduce dissolved gases. It aids in the removal of dissolved gas, iron, and manganese from groundwater, particularly when these metal concentrations are high.
What is cascade aeration process in wastewater treatment plant?
Natural draft units in Cascade Aerators mix cascading water with air that is spontaneously introduced, into the water flow to achieve aeration. Cascade water is pushed to the top of the aerator, and cascades down through a series of trays. Air is naturally introduced into the water flow to achieve iron oxidation, and a reduction in dissolved gases.
Impurities to target
1. Heavy metals
Advantages of cascade aeration
1. There are no moving parts.
2. Low cost and no upkeep.
3. Water Oxidation and Iron Oxidation.
Application of cascade aeration in WWTPs
It is used in the water and wastewater treatment process for a variety of reasons-
1. The unwanted gases in the water can be removed by replacing them with oxygen.
2. Increases the oxygen content of the water.
3. The corrosive property is reduced by removing CO2.
4. It removes dissolved gases like H2S (Hydrogen Sulphide) and CH4 from the water.
5. Cascade aeration is mostly gravity-based, and because of the large surface area in contact with the environment, this type of aeration is more efficient.
Application of cascade aeration in industries
3. Steel and Metal
4. Chemical, Dyes and Intermediates
5. CETP Plant
9. Salt Recovery
10. Sugar and Distillery
The aeration process in water treatment brings water and air into close contact by exposing drops, or thin sheets of water to air or by introducing small bubbles of air. It allows them to rise through water.
The processes by which aeration achieves the desired results are the same for both procedures:
1. Sweeping or scrubbing action caused by water and air turbulence mixing together.
2. Certain metals and gases are oxidized.
Aeration is accomplished with Cascade Aerators through natural draft units that mix cascading water with air, which is naturally inducted into the water flow. Cascade water is pumped to the aerator's top and cascades down a series of trays. To achieve iron oxidation and some reduction in dissolved gasses, air is naturally introduced into the water flow.
Still not sure if cascade aeration process is the best solution for your wastewater treatment plant?
The first step is to determine the quality of wastewater you have and the water you require. To assist you with this procedure, we provide a free water analysis test, as well as the manufacture of WWTPs.