Design calculation of Cascade Aerator || Water treatment plant calculation 

This Video is about the design and calculation of cascade aerator which is generally used in water and wastewater treatment plants for removal of odor gases, iron, excess carbon dioxide (CO2), H2S and CH4 by mixing the air into water.
Cascade aerators consist of a series of steps that allow water to fall in thin layers from one level to another where aeration is accomplished in the splash zones and The exposure time of air to water is increased by increasing the number of steps. And area-volume ratio could be improved by adding baffles to produce turbulence but the major operating problems include corrosion and slime and algae buildup.
Circular and RECTANGULAR ARE two main configurations, which are generally used.
Aeration equipment is used to intensively mix air and water so as to facilitate the transfer of gases into or out of the water.
So, Cascade aerator is used
For intensively mixing of air in water: It is necessary for surface water where the natural oxygen content was depleted due to the presence of large amounts of organic substances.
For removal of dissolved iron and manganese because Iron and manganese are oxidized and form nearly insoluble hydroxide sludges. They can be removed in a settling tank or by means of a coarse filter.
And cascade aerator is also used Removal of excess carbon dioxide (CO2) to prevent corrosion of metal and concrete surfaces.
And Reduction of H2S, CH4, and VOC and other volatile compounds that produce objectionable taste and-odor and ALSO USED FOR temperature reduction.
So, for detailed calculation please watch the above video.
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