国产精品机视频大陆,91丝袜精品久久久久久无码人妻,波多野野结衣一区,国产最大最爽免费A∨,美女被c视频在线观看

Fish pond aerator is a method of severely contacting air and water, with the aim of dissolving oxygen in the air into water or dissolving unwanted gases in water.

The double membrane theory holds that there are gas and liquid films at the gas water interface, and air and liquid flow outside the gas and liquid films, in a turbulent state. There is laminar flow between the gas film and liquid film, without convection, and under certain conditions, pressure and concentration gradients occur. There are two main types of aeration: air blowing aeration and mechanical aeration. Blast aeration is an aeration method that uses an aeration blower, aerator, diffuser plate or diffuser tube to introduce bubbles into water. This method is commonly used in sewage treatment. Mechanical aeration refers to the aeration method that uses impellers and other instruments to introduce bubbles. All aeration equipment must meet the following three functions: maintaining effective gas water contact, and maintaining a certain oxygen concentration in the water while biological oxidation continuously consumes oxygen. Generate sufficient mixing and water circulation within the aeration zone, maintain sufficient liquid velocity, and suspend biological solids in the water in the air. For biological aeration equipment, if the concentration of organic matter is too high or there is too much residual microbial film on the filter layer, partial anaerobic metabolism will occur inside the filter layer, leading to abnormalities. The solution is as follows: reduce the accumulation of microbial membranes in the aeration equipment, allow the biofilm to detach normally, and discharge it out of the tank through backwashing to ensure the normal operation of the aeration facilities and avoid the impact of high concentration or high load sewage. The biofilm is severely detached, and abnormal detachment of the biofilm is not allowed during normal operation of the aeration equipment. The main reason for producing a large amount of biofilm detachment is due to water quality reasons (such as high concentrations of inhibitory or toxic pollutants or sudden changes in acidity). The solution is to improve the water quality so that the water entering the aeration equipment is basically stable.

The treatment efficiency of fish pond aerators is low. If the aeration system is working normally and the growth of microbial membranes is good, the treatment efficiency will decrease. Usually, it is not caused by rapid changes in water quality or the inflow of toxic pollutants, but by the acidity, dissolved oxygen, water temperature, and short-term overload operation of the incoming water. For this phenomenon, as long as the degree of decrease in treatment efficiency does not affect the standard discharge of water quality, no measures will be taken, and it will return to normal after a period of time. If the water quality affects the standard discharge, some local adjustment measures should be taken, including adjusting the acid value of the inlet water, adjusting the gas supply, reactor insulation, inlet water heating, etc. When the pollution blocking ability of the aeration equipment decreases and backwashing is normal, only the pollution blocking ability of the aeration equipment decreases. This may be due to poor pretreatment effect and high carbon dioxide concentration in the water. At this time, it is necessary to strengthen the operation and management of the pretreatment facilities. The inflow water quality is abnormal and the inflow concentration is high. In this case, it is necessary to increase the aeration amount and aeration time to maintain the stability of the sludge load. This situation of low inflow concentration mainly occurs in rainstorm weather, which needs to be solved by reducing the aeration force and time. The abnormal water quality, mud and turbidity in the effluent are mainly caused by thick biofilm thickness, strong backwashing intensity or too many backwashing times, microbial loss, and decreased treatment efficiency. The solution is to increase the aeration rate and increase the dissolved oxygen content. The local water distribution system is obstructed, which may lead to insufficient local oxygen. The solution is to rectify or increase the recoil intensity. The main reason for the slight yellow color of the water is that the amount of chemical phosphorus removal in the biological aeration equipment is too much, and the iron salt exceeds the standard. Reducing the amount of chemical phosphorus removal is sufficient.

Fish farming is a common agricultural production and a good project for rural areas to adjust their industrial structure and increase farmers' income. However, there is a significant risk in the production process of this project, which is that fish ponds are prone to oxygen deficiency. When oxygen deficiency occurs in fish ponds, it can affect the growth of fish in the pond, and in severe cases, it may lead to serious consequences such as "flooding" of the fish pond. After the occurrence of oxygen deficiency in the fish pond, using an "aerator" to artificially aerate the pond is a more effective way to solve the problem of oxygen deficiency in the pond.

The "impeller type aerator", "waterwheel type aerator", and "water jet type aerator" mentioned by the questioner actually have similar oxygenation effects as long as their power is the same. Because their principle of adding oxygen to fish ponds is to stir the water, increasing the contact area between the water and the air, thereby allowing more and more oxygen in the air to dissolve into the water and effectively volatilize toxic and harmful gases in the water, thus solving the problem of fish hypoxia in the water.

In fact, these common aerators all have certain shortcomings, such as not being suitable for fish ponds with large areas and deep water levels; When the fish pond is severely lacking in oxygen, the aerator is only turned on, and the effect of oxygenation is not very obvious; Easy to cause electric leakage accidents, etc. So what kind of oxygenation equipment is better for fish ponds when experiencing hypoxia?

Of course, no matter how good the artificial oxygenation facilities or methods are, they cannot keep the water in the fish pond healthy and maintain high-quality water quality, which is commonly referred to as keeping the water "plump, lively, tender, and refreshing". This not only allows the fish in the fish pond to have more abundant natural bait, but also reduces the risk of oxygen deficiency in the pond. To maintain or control the fertility of the pond water, it is necessary to fertilize or plant aquatic plants. And by adding new water and replacing old water; Alternatively, chemical agents, biological regulators, etc. can be applied to achieve this.

In addition, to prevent oxygen deficiency in fish pond water, the most crucial thing is to have a reasonable stocking density and a reasonable variety combination, especially the proportion of filter feeding fish (silver carp and bighead carp). In short, to solve the problem of oxygen deficiency in ponds, the three types of aerators mentioned by the questioner have similar oxygenation effects under the same power. Therefore, in my opinion, to solve the problem of oxygen deficiency in ponds, we can consider using manufacturers of Qiantang aerators and improving the water quality of ponds.

The function of the aerator is not only to increase the dissolved oxygen in the water, but also to facilitate the concentration of organic debris, feces, algae residue, and residual bait in the pool due to water agitation, increasing the habitat and feeding space for shrimp.

At present, the widely used aerators in shrimp farming include waterwheel aerators, impeller aerators, fish pond aerators, etc. Plowing and surging machines are new types of aerating machinery in aquaculture. When they are started, they can generate a circulation effect between the upper and lower water layers through stirring, forming a three-dimensional circulating water flow, thereby breaking the stratification of the water body and improving the oxygen deficiency at the bottom.

Different types of aerators have their own characteristics. Using different aerators in the same pond can not only save electricity costs but also achieve complementary oxygenation effects; For example, in the high-level pond culture of Penaeus vannamei, bottom microporous aerators or aerators are installed, combined with water wheel aerators to eliminate water stratification; The rectangular low-level soil pool can be treated with a combination of surge machines and water wheel aerators for oxygenation.

The installation position of the aerator in the shrimp pond should be determined based on the characteristics of different types of aerators, combined with the size, shape, and water depth of the shrimp pond. It should be able to promote circular flow of the pond water. The start-up time and frequency of the aerator manufacturer in the clean feeding area should be determined according to the seedling density and algae concentration. Under normal circumstances, the aerator should be started twice a day within 20 days after seedling release, and 2-3 hours before dawn and noon. After 20-40 days of cultivation, the start-up time can be extended as needed; In the later stage of aquaculture, due to increased self pollution of the water body, the total weight of shrimp increases, and it needs to be turned on all day.

In addition, on rainy days, the startup time and frequency should be increased to maintain the dissolved oxygen level in the water above 5mg/L. After heavy rain, the aerator should be started to exchange the upper and lower layers.

When feeding, the machine should be stopped for 0.5-1 hour to facilitate shrimp feeding. In high-density precision aquaculture of Vannamei shrimp or shrimp factory farming in high-level ponds, oxygen concentrators or liquid oxygen devices can be installed in places where conditions permit. The oxygen concentration in the water is much higher than that of power oxygenation, which can be used to supplement dissolved oxygen or emergency situations in the later stage of aquaculture.

In general, in aquaculture ponds, you will see aquaculture aerators installed at the center position. Some will be equipped with impeller aerators, some will be equipped with waterwheel aerators, and some will be equipped with water jet aerators

Do you know their main function? Let's learn together;

What are the main roles of fish pond oxygenation in scientific aquaculture?

Let's talk about the answer first: there are four answers;

Function 1: Conventional oxygenation

Function 2: Aeration exhaust

Function 3: Adjust water temperature

Function 4: Increase yield

Now let's analyze and explain in detail!

1: Conventional oxygenation

This is also the most important function of the fish pond aerator. In order to increase the yield per acre of aquaculture, the density of aquaculture is generally increased during the breeding process. At this time, more oxygen needs to be contained in the water body. At this time, the aerator comes into play by rapidly rotating and stirring the water body through the impeller, quickly integrating fresh air from the atmosphere into the water body, thus achieving the goal of rapid oxygenation of the water body;

2: Aeration exhaust

The rotating impeller also increases the agitation of the water body, transferring the upper water pressure to the lower layer. While conveying fresh air, it also discharges the exhaust gas at the bottom of the pond, providing comprehensive isolation for the gas content in the pond water. Harmful and unfavorable gases for aquaculture are discharged, and fresh air is injected to maintain the activity and health of the water body, thereby maintaining the safety of the aquaculture environment;

3: Adjust the water temperature

In the process of aquaculture, the issue of water bodies is more easily overlooked, especially in extreme environments such as summer and winter. If the temperature of the water body exceeds the aquaculture temperature range, it can cause large-scale aquaculture deaths. Therefore, the aerator not only injects more oxygen into the water body during this process, but also agitates the water body to balance the water temperature. It can also control the temperature of the upper and lower layers of the water body to reach the equilibrium point, avoiding the situation where the temperature of the upper layer of the water body is high and the temperature of the lower layer is too low, especially in deep aquaculture ponds;

4: Increase production

The fourth main function of fish pond aerators is to increase production. After installing aerators, the breeding density of ponds of the same size can be expanded by one or more times. In other words, the weight of aquaculture produced per unit breeding time can reach one time, which can create greater value for aquaculture. Therefore, most aquaculture ponds are now equipped with fish pond aerators;

These are the four main functions of fish pond aquaculture aerators. Do you know that if your pond is not equipped with a fish pond aerator, then give it a try!

With the leapfrog development of the economy today, our living standards are constantly improving. However, the pressure on the Earth's environment is also increasing day by day. The alarm bell for environmental degradation has been sounded, and the concept of "low-carbon environmental protection" for the future environment is becoming more and more deeply rooted in people's hearts. For the impeller aerator, it can continue to maintain the normal flow of artificial lakes in rivers that have been polluted to a certain extent for a certain period of time, eliminate eutrophication of lakes and reservoirs, eliminate black, odorous, and other problems, improve the ecological utilization rate of sewage, classify river water and rainwater landscape water, and play an important role in environmental protection.

The impeller aerator can effectively increase oxygen within a certain range. Its powerful power can transport oxygen to over 30 meters away, forming a cycle, eliminating stratification, and adapting to the growth habits of fish and shrimp. It is different from the impeller aerator, as we generate certain waves during operation without damaging the pond foundation. So when installing the aerator, please try to lower your head as much as possible and keep a distance of no less than 30cm from the bottom of the tank. And during work, the water flow direction is positive and the rotation direction is correct. If not, then any two phase wires should be replaced.

During the operation of the impeller aerator, no one is allowed to enter the water to avoid electric shock accidents caused by motor leakage. And when eliminating faults in the water, the power must be cut off. In the mixing room, air and water are mixed and then quickly discharged under the action of centrifugal force. Due to the strong jet of the impeller aerator, it leads to effective convective circulation and the air is divided into many small bubbles.