The Working Principle And Use of Commonly Used Types of Aerator Skills

There are many types of aerator, there are about 20 types of aerator in China, the working principle of different types of aerator is not the same, and the applicable occasions are also very different; the correct selection and use of aerator, give full play to its effectiveness, is the necessary ability of every aquaculture workers.

I. Impeller aerator

1. Working principle and main function

Impeller type aerator is through the rotation of the wheel, the blade teeth scrape up the water body, form water droplets and thrown into the air to promote air dissolved into the oxygenation at the same time, the formation of negative pressure in the back of the blade teeth, inhalation of air, and then through the back of the blade teeth of the crushing mixture, the formation of a large number of bubbles, to promote the dissolution of air. Impeller aerator is through the leaping water, negative pressure air intake, update the liquid level of three means to promote air dissolved into the water, so the oxygenation speed, oxygenation efficiency; at the same time, the impeller aerator also has the function of lifting the water to promote the up and down convection of the pond water.

2. Use of methods and techniques

In the process of fishery production, in order to promote water convection up and down, reduce the oxygen debt of the pond water, sunny days at noon generally open 1-2 hours of the aerator, this time the choice of the majority of the aerator for the impeller-type aerator, the main reason for this is that the impeller-type aerator has the function of lifting the water, can be lifted up to the bottom layer of the pond's oxygen-deficient water, under the photosynthesis, to increase the amount of oxygen dissolved in the photosynthesis, at the same time, the release of which is harmful to the gas: forcing the surface layer of oxygen-rich water sinking, improve the pond water The oxygen-rich water in the surface layer is forced to sink, increasing the total amount of dissolved oxygen in the pond water and reducing the amount of oxygen debt. Sunny day at noon when the aerator, the pond in the upper layer of water dissolved oxygen is basically in a saturated or oversaturated state, the aerator dissolved oxygen is not significant; in order to reduce the energy consumption of this part, in the installation of the aerator, can be appropriate to reduce the height of the wheel disc, increase the amount of water to improve the leap, inhibit the negative pressure into the air, so as to reduce the dissolved air energy consumption, improve the effectiveness of the water.

Water lifting efficiency. Some manufacturers of aerators, the wheel disc axis downward extension and installed on a number of levels of small blades, in order to improve the water lifting effect of impeller-type aerator; this type of impeller-type aerator is only suitable for water depth of more than 3.5m deep-water ponds; shallow ponds, will stir up a large amount of mud, so that the pond water is turbid.

In the morning, when the pond is in first aid of oxygen deficiency, most of the impeller type aerator is used, mainly because the impeller type aerator has the ability to increase oxygen with high efficiency. However, at this time, the impeller type aerator water lifting function, not only is redundant and wasteful, and will contain a large number of oxygen debt and harmful gases in the bottom water to the surface, increased oxygen consumption, slowing down the upper layer of the water body of the dissolved oxygen content of the rate of increase in the first aid of hypoxia to create a negative effect. In order to improve the efficiency of oxygenation and reduce the water lifting capacity, when installing the aerator, the height of the wheel disc can be raised appropriately to reduce the amount of water jumping to ensure that the maximum negative pressure air intake to increase the amplitude of water jumping to improve the rate of atomisation. Due to the impeller type aerator in the rotation, there is a certain sinking amplitude, so in the installation of the aerator, need to be repeatedly debugging in order to find the best wheel height. Some manufacturers, the wheel disc has been improved to reduce the inclination of the wheel disc, which greatly reduces the water lifting performance of the impeller type aerator. Negative pressure air intake is the main reason for impeller aerator to get strong oxygenation capacity: However, on the market at present, some discs are only equipped with a number of air intake holes at the bottom, and no air intake holes at the back of the small lobe teeth, which is insufficient for air intake, and thus greatly reduces the oxygenation capacity of the impeller aerator; Therefore, when buying and selling the impeller aerator, we should pay special attention to the position and number of the air intake holes on the disc.

II. Paddle wheel aerator

1. Working principle and main function

Waterwheel aerator is through the rapid rotation of the blade, in front of the blade to form a pressurised airflow and will be pressed into the water to form a large number of bubbles, to promote the dissolution of oxygen; in the back of the blade to form a negative pressure airflow and the back of the blade to hit the droplets of water mixing, to promote the dissolution of air; at the same time when the blade out of the water, the water droplets and water mist, expanding the contact surface of the water and air, so that the dissolution of oxygen. Waterwheel aerator also has the function of promoting the horizontal flow of pool water.

2. Use of methods and techniques

Waterwheel type aerator oxygenation efficiency is not as good as impeller type aerator, but used in the morning hypoxia first aid, will not stir up the bottom water or bottom mud, is conducive to the rapid rise of dissolved oxygen in the surface water and oxygen-rich water spread horizontally. In order to further improve the oxygenation capacity of the waterwheel-type aerator, people in the waterwheel-type aerator installed on the inflatable pump, composed of a combination of aerator, not only greatly improve the oxygenation capacity, but also give full play to its level of oxygen-rich water to promote the dissemination of the ability to be more conducive to the pond in the morning first aid to increase oxygen. Waterwheel type aerator is generally used in shallow water ponds or factory fish ponds and some special aquatic products (e.g. eel) breeding ponds and fish egg hatcheries and so on.

III. Jet aerator

1. Working principle and main function

Jet aerator is in the jet, through the jet of water, the formation of negative pressure, inhalation of air, and high-speed water mixing, and then jet out, to achieve the purpose of oxygenation. As the jet stream contains a large number of air bubbles, in the process of uplift, the oxygen in it is constantly dissolved into the water body, and at the same time take away the harmful gases in the water body.

2. Use of methods and techniques

Jet type aerator capacity is not as good as the water car type aerator and impeller type aerator, but its stirring capacity of the water body is small, so, jet type aerator is mostly used in the benthic, afraid of disturbing the aquatic products in the aquaculture pool to increase oxygen.

IV. the surge machine

1. Working principle and main functions

Surge machine is driven by the motor rotation of the disc, through the disc on the small blade to promote water flow, the formation of waves on the surface of the water, and constantly to the surrounding diffusion to achieve the destruction of the surface film on the surface of the water, renew the surface of the water, to facilitate the dissolution of the air. The main function of the wave machine is to destroy the water surface film, the upper and lower water layers of the water body and the horizontal distribution of the basic churning ability.

2. Use of methods and techniques

Surge machine is mainly used in the windless night oxygenation, can be turned on all night. During the period of feeding a large amount of artificial compound feed, the water surface is easy to form an oil film, preventing the dissolution of air, exacerbating the lack of oxygen in the pond, triggering the floating head of the flooded pond; especially when feeding the pellet feed with high oil content or spraying oil on the outside, the water surface oil film is more and more thick. Turn on the surging machine all night, not only can constantly destroy the water surface oil film, update the liquid level, promote air dissolution, but also will not stir up the water, resulting in hypoxia occurred earlier; at the same time, the surging machine power is small, small energy consumption.

V. Water quality improvement machine

1. Working principle and main function

Water quality improvement machine through the submersible pump will be mixed with the mud and water into a slurry, inhaled and sprayed into the air to achieve the oxidation decomposition of sludge in the organic matter and other intermediate products, the release of harmful gases in the sludge, reduce the oxygen consumption of the sludge to reduce the oxygen debt of the pool water, and at the same time to promote the release of nutrient salts, increase the fertility of the water body, and to promote the reproduction and growth of zooplankton.

2. Use of methods and techniques

When using the water quality improvement machine, it is necessary to keep moving the position slowly. If it is fixed and not moving, what it sprays out is only bottom water, not mud. In addition, the water quality improvement machine can only be used on sunny days from 12 noon to 2 pm, when the dissolved oxygen in the pool water is high, and can only be turned on for 1-2 hours a day, and the mud can only be used for 1-2 hours a day.

It can only be turned on for 1-2 hours per day, and the area of the mud spraying area should not exceed one-third of the total area of the pond.

Although there are many types of aerators, and various types of aerators have different advantages and disadvantages, in order to give full play to the advantages of various types of aerators, to make up for each other's shortcomings, for a larger area, the need to install more than one aerator pond, it is best to install more than two types of aerators. In recent years, people not only on the aerator discs and blades and other improvements and innovations, but also designed a lot of new types of aerator, aerator oxygen, push water, water and other functions greatly improved.

In short, no matter how complicated the type of aerator, as long as we fully understand the working principle of various types of aerator, we can understand its performance characteristics, the correct choice and use of aerator, and can give full play to the advantages of various types of aerator, better for the service of fishery production.