Aeration Tank In Water Treatment Plant

Both methods are common but the aeration tanks are very different between the two types.

Aeration tank in water treatment plant. An aeration tank is a place where a liquid is held in order to increase the amount of air within it. Low levels of do will result in the death of the microbial biomass which is timely and expensive to reestablish. To maintain the proper oxygen levels for biomass productivity wastewater treatment operators utilize aeration pumps which add oxygen to the tanks. The aerator activates the sludge process by pumping air into a tank which results in increased microbial growth in the wastewater.

In municipal and industrial wastewater treatment aeration is part of the stage known as the secondary treatment process. It is also effective in precipitating dissolved iron and manganese. Aeration is used in water treatment as a pretreatment in the process of removing iron and hydrogen sulfide rotten egg smell from water. The microbes feed on the organic material forming flocks which can easily settle out.

The most common uses of aeration tanks are in wastewater recovery as the high oxygen levels will increase the speed at which the water is cleaned. The activated sludge process is the most common option in secondary treatment. Aeration as a water treatment practice is used for the following operations. These microbes start eating the organic material and form the flocks that get settled easily.

Aeration water treatment is effective for management of dissolved gases such as radon carbon dioxide some taste and odor problems such as methane and hydrogen sulfide as well as volatile organic compounds like mtbe or industrial solvents. Carbon dioxide reduction decarbonation oxidation of iron and manganese found in many well waters oxidation tower ammonia and hydrogen sulfide reduction stripping aeration is also an effective method of bacteria control. Aeration in an activated sludge process is based on pumping air into a tank which promotes the microbial growth in the wastewater. Dissolved oxygen is a critical parameter in the aeration process because oxygen levels in the tank impact the health of the biomass microorganisms breaking down the nutrients.

The ph of the aeration tank should be between 6 5 8 5 to avoid stress on the microbial community and for optimal biological activity. Methods of aeration. Dissolved oxygen levels in the aeration tank must be maintained at 1 3 mg l for effective treatment. At normal water temperatures aeration can reduce the carbon dioxide content of the water to as little as 4 5 mg l.

Two general methods may be used for the aeration of water. Air is a powerful oxidizer of both iron and hydrogen sulfide. After settling in a separate settling tank bacteria forming the. This paper presents the types of aeration systems used in the biological stage of a wastewater treatment plant.

There are two main methods of aerating liquid. Forcing air through the liquid or forcing liquid through the air.