This presentation shows the examples, which confirm the importance of using agitators in the small or large-scale water body, to improve water quality in terms of the oxygen content. Especially, the submersible type of agitators is demonstrated, which is able to transfer the motion energy at a distance and to a wide mass of water. The examples, showed in the paper, relate to submersible mixers and agitators/aerators that have been used in natural water bodies (small ponds, large ponds and river), as well as in ponds and lagoons contaminated with industrial wastewater discharge (power plant blowdown, petrochemical waste lagoons).
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