Device and method for precise control on dissolved oxygen and pH value in medium/small-size aquaculture water

Abstract

The invention relates to a device and a method for precise control on dissolved oxygen and pH values in medium / small-size aquaculture water. The device comprises a gas mixer, an air compressor, an oxygen steel cylinder and a carbon dioxide steel cylinder, wherein the air compressor, the oxygen steel cylinder and the carbon dioxide steel cylinder are respectively connected with the input end of thegas mixer; the output end of the gas mixer is connected with a first end of a three-way tube; a second end of the three-way tube is connected with a first input end of a degassing membrane; a third end of the three-way tube is connected with an oxygen sensor and a carbon dioxide sensor; data of the oxygen sensor and the carbon dioxide sensor are transmitted to a recorder and are displayed; and the output end of the degassing membrane communicates with an aquaculture vat. Through reading of the oxygen sensor and the carbon dioxide sensor, different gas flows can be precisely adjusted, furthermore, air, oxygen and carbon dioxide can be sufficiently mixed in a static mixer, and after the mixed gas and seawater meet gas-liquid balance in the degassing membrane, seawater with stable and controllable dissolved oxygen and pH values is obtained from the output end of the degassing membrane for aquaculture or related scientific research experiment.

Description

Technical field: [0001] The invention relates to a device and a method for accurately controlling dissolved oxygen and pH in medium and small scale aquaculture water bodies. Background technique: [0002] Dissolved oxygen and pH value are two important indicators for measuring water quality standards in aquaculture. The reduction of dissolved oxygen will inhibit the growth and development of aquatic organisms, and even cause death in severe cases. [0003] If the pH value of the water body is too low or too high, it will cause acidosis or alkalosis of aquatic organisms, which will also cause great harm to their survival. Small and medium-scale aquaculture water bodies have a relatively weak buffering effect because of their small water volume. At the same time, the aquaculture organisms The density is often on the high side, so there are often large fluctuations in dissolved oxygen and pH values, which is not conducive to the cultivation of aquatic organisms. [0004] In re...

AI Technical Summary

Problems solved by technology

[0005] The existing device realizes the control of dissolved oxygen in aquaculture water through negative feedback regulation, but lacks the function of controlling the pH value of the water, so it is difficult to apply to some aquaculture activities that require high pH stability; at the same time, considering the current The upper limit of the measurement range of most online dissolved oxygen electrodes does not exceed 20mg / L, so the application of the existing technology in the high dissolved oxygen culture conditions of liquid oxygen aeration also has certain limitations

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