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Mechanical aerators, such as surface aerators and brush aerators, aerate the surface of the water mechanically and promote diffusion of oxygen to water from the atmosphere. The concentration of dissolved oxygen in the liquid can be controlled by adjusting the speed of the rotors.
Mechanical aeration, or agitating the liquid's surface mechanically, can be employed to introduce oxygen into aeration tanks through diffusion (diffused aeration). An aeration system improves the oxygen transfer required to support a biological process by increasing the air/water contact within a process liquid.
27 Φεβ 2002 · Written by three leading aeration experts, Aeration: Principles and Practice, covers the principles and practice of aeration, a unit process critical to the performance of activated sludge...
Aeration is used to reduce the concentration of carbon dioxide (decarbonation), ammonia, and hydrogen sulfide in water. Unlike oxygen, these gases ionize in water. To remove carbon dioxide and hydrogen sulfide, the pH of the water is lowered by adding acid. For example, over 95% of carbon dioxide can be removed from ambient water at pH of 5.0.
Different aeration methods such as mechanical, diffused, and natural aeration each have unique advantages that can optimize industrial applications. Mechanical aerators provide vigorous mixing and high oxygen transfer rates suitable for large-scale systems.
8 Φεβ 2010 · Aeration occurs in many water and wastewater treatment processes, but in the activated sludge process and its variants, it consumes more energy than other processes, by far. Reducing energy consumption during aeration is usually the best initial step to minimize energy cost.
26 Μαΐ 2015 · This paper used investment analysis to assess the potential economic benefits of mechanical soil aeration to alleviate severe soil compaction on a North Otago Rolling Downlands dairy farm. Soils on this farm had been structurally damaged after 4 years of consecutive winter forage crop grazing.
