Aeration Process In Water Treatment

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Aeration process in water treatment. 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. Aeration is a unit process in which air and water are brought into intimate contact. One negative effect of nutrient enriched wastewater is the development of harmful algal blooms or dead zones in major bodies of water. Aeration in an activated sludge process is based on pumping air into a tank which promotes the microbial growth in the wastewater.

The bacteria in the water require oxygen for the biodegradation process to occur. Aeration provides oxygen to bacteria for treating and stabilizing the wastewater. The microbes feed on the organic material forming flocks which can easily settle out. Methods of the water treatment process are explained below.

The aeration process may be considered a major part of total energy demand and operational costs. Aeration treatment consists of passing large amounts of air through water and then venting the air outside. 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. Water treatment aeration many water treatment processes use a variety of forms of aeration to support biological oxidative processes.

After settling in a separate settling tank bacteria forming the. The scrubbing process caused by the turbulence of aeration physically. 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. Turbulence increases the aeration of flowing streams.

The removal of nutrients is critical because wastewater that is overly rich in nutrients can cause ecosystem imbalances if released into the environment. In industrial processes water flow is usually directed countercurrent to atmospheric or forced draft air flow. The air causes the dissolved gases or volatile compounds to release from the water. The contact time and the ratio of air to water must be sufficient for effective removal of the unwanted gas.

The water treatment process generally adopted depends upon the quality of raw water and quality of water derived. The bacteria in the wastewater break down the organic matter containing carbon to form carbon dioxide and water utilizing the supplied oxygen. Fouling control is another main part of energy consumption. The water treatment process includes many operations like screening aeration and sedimentation sedimentation with coagulation softening filtration disinfection etc.

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. Aeration is an important step in the process of treating wastewater including sewage effluent. The activated sludge process is the most common option in secondary treatment. In municipal and industrial wastewater treatment aeration is part of the stage known as the secondary treatment process.