Aeration and mixing
The dense fish biomass and consequently high feeding rations both lead to high oxygen consumption. Reliable means to ensure proper aeration and maintenance of adequate oxygen concentration is essential, including full proof backup systems for cases of failure (If some thing can get wrong, it will). In addition, the pond should be thoroughly mixed, to prevent the presence of stagnant corners where sludge accumulates and anaerobic conditions develop and prevail.
Aeration and mixing are both provided by a variety of aerators, mostly paddle wheel aerators. Combination with aspirators and with air-lifts is recommended.
Paddle wheel aerators are effective means to add oxygen to the water, however dissipate most of the energy toward the surface layers of the water and only a fraction to mix and aerate bottom layers of the pond. There is a need for effective aerators that combine aeration and mixing of the whole water column. To obtain radial or elliptic water flow aerators are placed in parallel to the dykes, yet, should not be placed close to the dyke. A distance of about 20 meters from the dyke is recommended (25-30% of pond width). Aspirators or air-lifts should be located in the center of the pond or in sites where sludge accumulates, to get resuspension of organic particles. Resuspension of organic particles enable aerobic metabolism and recycling of the organic residues and prevents anaerobic sludge accumulation.
Aeration and mixing
The dense fish biomass and consequently high feeding rations both lead to high oxygen consumption. Reliable means to ensure proper aeration and maintenance of adequate oxygen concentration is essential, including full proof backup systems for cases of failure (If some thing can get wrong, it will). In addition, the pond should be thoroughly mixed, to prevent the presence of stagnant corners where sludge accumulates and anaerobic conditions develop and prevail.
Aeration and mixing are both provided by a variety of aerators, mostly paddle wheel aerators. Combination with aspirators and with air-lifts is recommended.
Paddle wheel aerators are effective means to add oxygen to the water, however dissipate most of the energy toward the surface layers of the water and only a fraction to mix and aerate bottom layers of the pond. There is a need for effective aerators that combine aeration and mixing of the whole water column. To obtain radial or elliptic water flow aerators are placed in parallel to the dykes, yet, should not be placed close to the dyke. A distance of about 20 meters from the dyke is recommended (25-30% of pond width). Aspirators or air-lifts should be located in the center of the pond or in sites where sludge accumulates, to get resuspension of organic particles. Resuspension of organic particles enable aerobic metabolism and recycling of the organic residues and prevents anaerobic sludge accumulation.
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