Aeration Process In Water Treatment

Water treatment aeration many water treatment processes use a variety of forms of aeration to support biological oxidative processes.

Aeration process in water treatment. Turbulence increases the aeration of flowing streams. Aeration constituents are removed or modified bee with the treatment fore they can interfer processes. Aeration is often the first major process at the treatment plant. The scrubbing process caused by the turbulence of aeration physically.

A typical example is activated sludge which can use fine or coarse bubble aeration or mechanical aeration cones which draw up mixed liquor from the base of a treatment tank and eject it through the air where oxygen is entrained in the liquor. The water treatment process generally adopted depends upon the quality of raw water and quality of water derived. Aeration in water treatment is a must have process for the water bodies suffering from anaerobic conditions that are often caused by human activities such as excessive fishing done in the lake or sewage discharges. In municipal and industrial wastewater treatment aeration is part of the stage known as the secondary treatment process.

The activated sludge process is the most common option in secondary treatment. Aeration brings water and air in close contact by exposing drops or thin sheets of water to the air or by introducing small bubbles of air the smaller the bubble the better and letting them rise through the water. After settling in a separate settling tank bacteria forming the. The energy consumption of aeration in mbrs in a normal wastewater treatment plant is about 0 4 kwh m3 effluent whereas in casps it is in the range of 0 25 0 40 kwh m 3 krause 2005.

It can also be used to remove volatile organic chemicals voc in the water. The air causes the dissolved gases or volatile compounds to release from the water. Aeration in water treatment the water from the equalization tank is pumped into the aeration tank where treatment of the sewage water begins. The process of maintaining the oxygen saturation levels of water in natural as well as artificial environment is termed as aeration.

The contact time and the ratio of air to water must be sufficient for effective removal of the unwanted gas. Fouling control is another main part of energy consumption. The aeration tank consists of the bio media suspended in the water and agitated by aeration. The aeration process may be considered a major part of total energy demand and operational costs.

In industrial processes water flow is usually directed countercurrent to atmospheric or forced draft air flow. Aeration is the process of bringing water and air into close contact in order to remove dissolved gases such as carbon dioxide and to oxidize dissolved metals such as iron. Aeration in an activated sludge process is based on pumping air into a tank which promotes the microbial growth in the wastewater. Aeration is a unit process in which air and water are brought into intimate contact.

Aeration treatment consists of passing large amounts of air through water and then venting the air outside. Methods of the water treatment process are explained below. The air and the contaminants released from the water are vented.