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Biological fermentation is a process of converting raw materials into desired products through metabolic reactions using microbial or cellular catalysts. Biological fermentation technology is widely used in food, pharmaceutical, environmental protection, energy and other fields, including alcohol fermentation, amino acid production, antibiotic fermentation and so on. In the design and selection of biological fermentation system, many factors must be considered to ensure the efficient operation, stability and economy of the system. Based on the key factors in the process of biological fermentation, this paper discusses some problems that need attention in the design and selection of biological fermentation system.

Fermentation is an ancient biotechnology, widely used in food, beverage, medicine and other fields. Acid fermentation refers to the process of converting sugars in raw materials into acids under the action of microorganisms. Common fermentation acids include lactic acid, acetic acid, citric acid, etc. These acids not only play an important role in food processing but also have a wide range of applications in industrial production.

As a kind of sustainable agricultural inputs, biofertilizers have been widely concerned and applied in the world in recent years. Biological fertilizer can not only effectively improve soil fertility, enhance plant disease resistance, but also has the advantages of environmental protection, pollution-free, non-toxic, and has become an important direction of modern agricultural development. As one of the core technologies of biofertilizer production, biological fermentation technology plays a key role. Through the fermentation process, organic waste can be converted into biofertilizers rich in nutrients and beneficial microorganisms, thereby effectively improving the quality and effectiveness of fertilizers. This paper will discuss in detail the application of biological fermentation technology in bioferfertilizer industry and how to select suitable fermenters.

With the improvement of people's living standards and the deepening of health concepts, dairy industry has become an important part of the global food industry. In recent years, biological fermentation technology, as an advanced bioengineering technology, has been widely used in the production process of dairy products, especially in improving product quality, innovating product types and improving production efficiency. This paper will discuss the application of biological fermentation technology in dairy industry, and look forward to its future development prospects.