It has been five thousand years since human beings used yeast to make fermented products. Modern research has proved that fermentation process is a process of microbial reproduction and metabolism. The discussion of fermentation is an ancient and modern topic.

The fermentation of organic materials is basically inseparable from yeast, which is one of the strains with more research, wide use and high utilization rate in microbial technology. So far, more than 1200 kinds of yeast have been found. However, the species of biological bacteria discovered by human beings are not limited to yeast for a long time. There are about 200000 species recorded, some of which are about 6 million, and some of which are trillions. However, the actual applied species are less than 10% of the discovered ones. It can be seen that the existing microbial technology is still in its infancy. Even so, microbial methods have played an irreplaceable role in chemical or physical methods, showing great technical power and application prospects.

Different chemical, physical and biological properties of the same material can be obtained by selecting different microbial groups. Microbial application technology research is difficult to leave the fermentation, including the production of microbial agent itself, which can only be obtained through fermentation. It can be seen that fermentation technology is both common and high-end.

For the fermentation mode, it can be roughly divided into solid fermentation and liquid fermentation from the morphology, and there are also solid liquid mixed fermentation, such as Sichuan people doing heavy dregs or processing Chinese medicine; It can be divided into anaerobic and aerobic fermentation in terms of characteristics. In fact, there is anaerobic and aerobic co fermentation. For example, the "Saccheromgces Cerevisiae" we use can ferment under both aerobic and anaerobic conditions. Different fermentation methods or mixed fermentation methods can be adopted according to actual needs.

Our invention * technology "Biological drying method for urban domestic sludge" (ZL201010252137.8) is the result of decades of research and development by the company's multi professional technical team, which has solved the * problem of urban domestic sludge treatment and disposal. On the premise of harmless and stable treatment, the amount of each ton of sludge (80% moisture content) will be reduced to about 50-300 kg, and the residue will be used as resource to make it return to nature smoothly. As previously mentioned, a multi-mode fermentation technology is used. In the process validation, at first glance, it seems that it is just "compost", and it seems that you can do it without learning. However, there are many mysteries and difficult technical contents. For example, the "multi-functional biological organic fertilizer", "soil conditioner", "desert control agent", "saline alkali land repair agent", etc. produced by our other inventions are also obtained through fermentation process. The use effect of the same products obtained by fermentation may be quite different, and the difference stems from the level of biotechnology.

Biotechnology does not only refer to fermentation technology, but fermentation technology must be biotechnology.

In a word, the fermentation technology, which was invented 5000 years ago, is still a top less technology and needs to be constantly climbed.

(Author Yuan Denghui)