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Biological fermentation is a core process in industrial biotechnology and is widely applied in fields such as pharmaceuticals, food, energy, and biomaterials. Traditional fermentation systems typically employ constant environmental conditions, such as constant pH and constant temperature, to provide the optimal growth environment for microorganisms. However, in many natural ecosystems, the growth environments of microorganisms are not uniform but rather exhibit distinct pH and temperature gradients. Therefore, simulating these natural conditions and constructing a multi-stage gradient bioreactor system not only helps enhance the metabolic efficiency of specific microorganisms but also facilitates the discovery of more functional microorganisms and their products in extreme environments.

With the rapid development of biotechnology, the application of extremist microorganisms and their special metabolic products in industries, environment, energy and other fields has become increasingly widespread. Such microorganisms often survive in extreme environments such as high temperatures, strong acids, strong alkalis, high salts or high pressures, and their metabolic products often have strong corrosiveness, toxicity or flammability and explosiveness. Therefore, in the process of its industrial application, the material selection and safety design of the reactor have become one of the core technical issues. The rational selection of materials not only affects the service life and operating costs of the reactor, but also directly influences the safety and stability of the production process.

Biological fermentation technology is a core link in modern bioengineering and is widely applied in fields such as pharmaceuticals, food, energy, and environmental governance. Throughout the entire fermentation process, the fermenter serves as the reaction site, and its performance directly affects the growth of microorganisms, metabolic efficiency, and product quality. The "material" of the fermentation tank, as the fundamental component of its structure and function, plays a crucial role in ensuring the stability of the reaction system, reaction safety, aseptic environment, and corrosion resistance. Therefore, the rational selection of the material for the fermentation tank not only affects the service life and maintenance cost of the equipment, but also influences the biocompatibility and metabolic dynamics of the fermentation process at the micro level.

Biological fermentation is a process that uses microorganisms to transform organic matter and generate products under controlled conditions, and it is widely applied in the fields of pharmaceuticals, food, chemical engineering, environmental protection, etc. During the fermentation process, the transfer of oxygen, the homogeneity of the culture medium and the growth and metabolism of microorganisms are closely related, and these three aspects are largely influenced by the stirring and ventilation systems. Therefore, a thorough understanding of the role of the stirring and aeration system in the fermentation process is of great significance for improving fermentation efficiency and optimizing process control.