Ocean acidification and low oxygen simulation device and control method thereof

Abstract

The invention relates to an ocean acidification and low oxygen simulation device and a control method thereof. The ocean acidification and low oxygen simulation device comprises a gas source, an air drying and filtering pressure reducer, a standby safety electromagnetic valve, a CO2 filter, a drying filter, a mass flow controller, an acquisition controller, a water quality sensor and an exhaust valve group. According to the ocean acidification and low oxygen simulation device and the control method thereof, a pH value and a dissolved oxygen value of seawater are monitored in real time by meansof a pH sensor and a dissolved oxygen sensor, and the dual-incremental PID control mode is adopted for adjusting an aeration ratio of air, N2 and CO2, so as to adjust the pH level and the dissolved oxygen level of seawater to set values and keep them in steady states. The ocean acidification and low oxygen simulation device and the control method thereof can monitor and adjust the gas source ratio in real time, control the pH content and dissolved oxygen content of seawater synchronously, have the advantages of high steady-state precision, good dynamic response, short adjustment time and thelike, and can still maintain high precision under the condition of marine biological respiratory interference.

Description

technical field [0001] The invention relates to the field of ocean environment simulation, in particular to an ocean acidification and hypoxia simulation device and a control method thereof. Background technique [0002] Global climate change and the intensification of human activities such as coastal eutrophication have led to ocean acidification and hypoxia, which often occur at the same time. Such phenomena have been reported frequently in my country's offshore environment, which poses a huge threat to marine life and the safety of the marine ecological environment. At present, most studies use acidification or hypoxia alone to carry out relevant stress experiments, and research on the synergistic effects of acidification and hypoxia is urgently needed. Therefore, the development of devices that can accurately simulate ocean acidification and hypoxia is of great significance for carrying out controllable simulation experiments and exploring the impact of ocean acidificat...

AI Technical Summary

Problems solved by technology

This method can only simply control whether the gas is fed or not, but cannot adjust the gas ratio. Therefore, the aeration is unstable, and the aeration volume and aeration cycle change significantly, and precise control cannot be performed.

In addition, the inflow of gas from time to time has an impact on the behavior of marine organisms, which in turn affects the accuracy of the research results

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