Influence of common oxygenation methods on aquaculture water environment
Posted by Admin | 10 Jun
Fourth, improper control of the boot time will suffer. Therefore, when using this type of aerator to increase oxygen, it must be flexibly controlled according to the weather, water quality, and feeding activities of farmed animals. Turn on the device in the middle of the night and not in the evening.” Otherwise, it may not only fail to achieve the expected effect, but even suffer from it.
4. Inflatable aerator It consists of a complete set of equipment such as a power motor, an air compressor, an inflatable header, a microporous tube (also known as a nano-microtube), etc. Its working principle is that the motor works on the air compressor, and the air is pressed to the microtube through the inflation header. Then, it is pressed out from the nano-scale pores of the microtube to form tiny bubbles, which are dispersed and dissolved into the water body. According to the different pond shape, bottom shape and water depth, the arrangement density, spacing distance and height from the bottom of the pond should be reasonably assembled and set. Its features: First, the air is directly input to the bottom of the pool, and tiny bubbles are formed, which increases the contact surface between the air and the water body and makes it easier to dissolve into the water body. The second is that the microporous tubes are evenly arranged on the entire bottom of the pool, and the oxygenation does not leave dead ends. The third is that the tiny gas discharged from the microporous tube can form an air curtain, and the friction between the air and the water body generated in the process of air rising pushes the bottom water body to flow to the upper layer, bringing the water body in the low temperature and anoxic state at the bottom of the pool to the upper layer of the water body. The entire pond water (oxygen content) is exchanged and mixed, thereby promoting the transformation of the bottom "reduced state water" (reduced environment) into "oxidized state water" (oxidative environment), so that the entire breeding environment can be effectively improved. Fourth, the entire power system is on the shore or above the water surface, and the noise generated by it is not directly introduced into the water body and has little impact on the cultured animals, especially the breeding ponds for special aquatic products such as blue shrimp, river crabs, vannamei, mandarin fish, and soft-shelled turtles. more beneficial. However, compared with the water stirring aerator, it has disadvantages such as large equipment investment, difficult installation, and unfavorable fishing.
5. Chemical oxygenation The use of chemical methods to increase oxygen should be said to be a last resort. At present, there are three types of quick-acting type, slow-release type and water preparation type on the market, not to mention whether its main ingredients (sodium peroxide, alkali peroxide or hydrogen peroxide, etc.) contain any toxic and harmful substances, but it is harmful to the water body. The change of pН value and its influence on plankton in water cannot be ignored. When the application amount of such chemical oxygenates reaches more than 200g/mu, the measured pН value will rise to more than 9. In slightly alkaline waters with a pН value of over 8.8, the decomposition of mucus on the fish body surface is accelerated, the skin's ability to resist the erosion of harmful microorganisms is weakened, and the gill tissue is corroded, which affects the fish's breathing ability. Therefore, it is better to use this type of oxygenation agent sparingly, and it can only be used in an emergency state where severe hypoxia occurs and other oxygenation measures are ineffective.