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nature : for biological wastewater treatment equipment. General deep pool of 2 to 5 meters. To keep the sewage pond-into the air or mechanical mixing, the water a definite dissolved oxygen, biochemical oxygen demand to supply purposes. Aeration is equivalent to the effect of the process of self-purification ordinary surface water for several days or several kilometers process. The development direction is to increase efficiency, size reduction, energy savings, the new method is aeration deep aeration, pure oxygen or oxygen-enriched aeration so.
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