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Aerobic Treatment - Definition

Aerobic treatment is a technique involving the use of oxygen for the treatment of farm waste. The slurry is fed into a tank which allows mixing and aeration. It is usually only suitable for separated slurry or dilute effluents. Solids in the waste stream increase the amount of oxygen needed and also increase the amount of energy needed for mixing. The most efficient oxygen transfer occurs when very small bubbles are used. The most successful aerators are "sub-surface" and "Venturi jet" whilst "compressed-air sparge systems" are more efficient in deep tanks. Aerators should supply a minimum of 1 kg of dissolved oxygen for each kilowatt hour they are used, if they are to be economical.

A reasonable constant volume of slurry is required each day to give controlled retention times, dry matter content of less than 3% is necessary. Bedding material and animal hair should be absent and a suitable oxygen concentration throughout the treatment tank should be achieved by effective mixing.

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