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Need of oxygen : Air is essential for all living beings on this earth On earth oxygen requirement is fulfilled by photosynthesis of plants and trees. Likewise; in aquaculture ponds water receives oxygen through photosynthesis of aquatic plants and diffusion through surface of water. Dissolved oxygen (DO) is one of the most important water quality parameters affecting the quality of aquaculture pond water. airoxi Aeration is the term used to provide oxygen i.e. DO to the aquatic animals. Aquatic animals and organisms in water require oxygen for respiration and other biological activities. DO is the most critical water quality parameter in any aquaculture operation because all biological activities require a constant supply of DO in the pond. Therefore, a basic understanding of the mechanism of aeration necessitates to aid
aquaculturists in the successful management of pond growing systems.
Principle : Aeration is the addition of oxygen or air containing oxygen to water.
Any aquatic species important for commercial purpose requires oxygen. Transfer of oxygen in a water body can be termed as a three step process.
– Transfer of oxygen in the gas to gas liquid interface.
– Transfer across the gas liquid interface.
– Transfer of oxygen away from the interface into the liquid.
Types : Different types of aerators have been developed in an effort to improve the energy efficiency of the oxygen mass transfer process. These aerators work mainly on two principles:
(i) aeration by splashing water into the air i.e. paddle wheel aerator, vertical pump, pump sprayer, gravity aerators etc.
(ii) or (ii) aeration by bubbling air into water i.e. propeller aspirator, blower airoxi aeration system etc.
In aquaculture, , verticalpump aerators, airoxi tube diffused-air aeration systems and paddle
wheel aerators are widely used.