Fundamentals

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2. The oxidation ditch uses brush or low speed aerators that impart velocity to the water in a circular ditch so that like a river the water flows continuously around the circular or oval ditch. Thus the bottom velocity on the floor of the ditch can be maintained with less energy and the high MLSS solids can be kept in suspension with less mixing energy and with less shearing of the biological floc.

3. Finally, the dissolved oxygen levels vary as the water moves from one point to the other in the circular ditch (high right after the brush aerator and low as the water moves toward the next brush). There is also horizontal layering in the channel that promotes different DO levels around the ditch. The benefit of the various DO with the high nitrogen abattoir wastewater is that ammonia nitrogen present and generated from protein breakdown is oxidized to nitrite and nitrate and then denitrified simultaneously within the circular channel because of the DO variations and stratification.

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