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We need to know what the oxygen consumption of all microorganisms in this nursery is. Second, we need to determine how much energy aeration equipment corresponds to the amount of oxygen needed to add oxygen to keep the oxygen dissolved in water at an appropriate level.
We traveled around the world on shrimp farms and saw different types of aerators on different shrimp farms. Electric, diesel, plastic, metal. In this article we would like to tell you what we have learned and what you need to look out for when looking for new aerators for your shrimp farm.
Why is ventilation important?
Aeration of shrimp is important for several main reasons:
It retains dissolved oxygen overnight after photosynthesis has stopped. When the top of the water column is raised and sprayed into the air, additional oxygen molecules are introduced between the water, keeping the oxygen level at a safe level.
This enables a higher fit. Not only can aerators keep shrimp with a higher density safer due to the higher dissolved oxygen, but without this higher oxygen content, the shrimp cannot digest the food nearly as efficiently, which leads to an unsuccessful FCR jump.
For ponds with an internal sludge drainage system, the aeration system can generate a current that slowly pumps solids into the middle of the pond and into the wastewater storage.
Electric or diesel?
It really depends on the electricity that is available on the farm. Electricity is much better in terms of sustainability because electricity can be generated from more environmentally friendly sources. If you want to automate ventilation, it is also easier to integrate automation into an electronic system than to integrate a relay into a diesel. This is possible with a diesel engine, only harder.
The downside of this is that electrical systems may be less stable. Lightning can hit nearby power lines, destroy the entire system, etc.
Other things to look for:
Engine quality: that's the main thing. We have heard from many farmers who bought cheaper paddle wheels to spend a lot more money on their maintenance after engine damage and repair needs. Investing in a better engine pays off.
Impeller design: We haven't seen such a big difference in the design of the impeller from one to the other, but they are insignificant. Read the specs, ask them to speak to the other farmers who bought them, and see how the aerator's rated output actually turns into ventilation.
Plastic quality: Here, too, it depends on the price. Cheap plastic decomposes faster in water and strong sunlight. When you invest in an aerator, you invest in one that lasts a long time.
Sophisticated gear mechanics: In small businesses, a single motor and a complex set of gears were used to turn multiple wheels. This loses money over time compared to using multiple motors due to the loss of energy in each gear set. You'd better invest more money in new engines. You generally save money and use less energy.