Biosurfactants are a class of biological compounds with surface activity produced by microorganisms. In addition to the physical and chemical properties of chemically synthesized surfactants, they also have the advantages of non-toxicity and high efficiency. Alternatives or upgrades to synthetic surfactants. This paper summarizes the research progress of biosurfactants in bioremediation of organic pollution in recent years, and looks forward to the development direction of this technology. This will lay the foundation for the research and application of this method in our country.

After surfactants form micelles in aqueous solution, they have the ability to significantly increase the solubility of insoluble or slightly water-soluble organic compounds, and the solution is transparent.

Surfactant molecules are adsorbed at the gas-liquid interface. Figure 7 is a schematic diagram of surfactant molecules in the adsorption process. When the concentration is very dilute, the adsorption amount is small, the surface adsorbed molecules are less, and can lie flat on the gas-liquid interface; as the concentration increases, at medium concentrations, the orientation of surface adsorbed molecules on the solution surface has greater randomness

While surfactants bring great convenience to people's life and industrial and agricultural production, they also pollute our environment. This is a worldwide problem, especially in our country, which should be paid more attention to.

Alkyl glycoside APG soil-free drilling fluid has less solid content and less submicron solid particles, which greatly relieves the solid phase from invading the formation and blocking the reservoir pore throat during drilling, and reduces the damage of solid to the reservoir.

The steady growth of surfactants in the world provides a good external environment for the development and growth of the cosmetics industry, and the requirements for product structure, variety, performance and technology are also getting higher and higher.

Adsorption of surfactants (from solution) on soiled and washed surfaces has a major impact on cleaning action. This effect is mainly due to the changes in various properties (such as mechanical properties, electrical properties and chemical properties) of the interface and surface due to adsorption.

The use of biosurfactants to remediate soils contaminated by hydrocarbons and crude oil is a new technology. For example, cascara produced by Pseudomonas aeruginosa removed a large amount of oil from the Alaskan gravel. VanDyke et al. found that from contaminated sand and mud, the rhamnolipids produced by Pseudomonas aeruginosa can increase the recovery of hydrocarbons by 25% to 70% and 40% to 80%, respectively. Similarly, treatment of sandy soils with biosurfactants produced by Pseudomonas aeruginosa resulted in 56% and 73% recoveries of aliphatic and aromatic hydrocarbons, respectively.

Flame retardant science and technology is a science developed to meet the needs of social safety in production and life, prevent fires, and protect people's lives and property.

The use of surfactants in the flotation of ore is to use the floating effect. Stir and blow air from the bottom of the pool, the bubbles with effective mineral powder gather on the surface, collect and defoam and concentrate, thus achieving the purpose of enrichment. The mud, sand and rocks without ore are left at the bottom of the pool and should be removed regularly.

The application of surfactants in aquatic pharmaceutical preparations can improve the appearance properties of the production process and the form of administration, such as stability, clarity, hardness, water solubility, disintegration, solubility, color and taste, etc. In actual application, it can improve the bioavailability of pharmaceutical preparations, but on the other hand, improper use of surfactants will interact with the ingredients in the drug prescription and cause physical and chemical changes (redox, catalytic hydrolysis), which will affect the pharmaceutical preparations The stability of the product, and even affect the curative effect, should be studied before being used in practice when selecting varieties.

Emulsifier is a kind of surfactant. The function of surfactant is to emulsify, and there are others. The main functions of surfactant are: stain removal, emulsification, solubilization, suspension, foaming and defoaming, There are many kinds of surfactants such as sterilization.

This paper summarizes the research progress of biosurfactants in bioremediation of organic pollution in recent years, and looks forward to the development direction of this technology. This will lay the foundation for the research and application of this method in our country.

Oxygen-increasing principle of surfactants: Adding surfactants to aquaculture water can increase the saturation solubility of oxygen in aquaculture water. According to the hydrate formation theory and the double-membrane theory, since the solubility of oxygen in water is very small, water-oxygenate is generally first formed at the gas-liquid interface in water, and then slowly diffuses from the gas phase to the liquid phase.

Surfactants are often used in industrial industries, and most of them are used in the laundry and textile industries, but they cannot be used in all fine industries. All of our industrial industries, including the pharmaceutical industry, are also inseparable from the use of surfactants, and the paper industry is also a field of the fine industrial industry, and surfactants are also used in the paper industry.

The internal stress of concrete layout is very high, and no strong hard force layout can hinder its opening. The high strength and good adhesion of the grouting adhesive can hinder the continuous expansion of cracks, but new cracks will occur because of the necessary release of the internal stress of the concrete layout. In order to make up for this shortcoming, we need an elastic layout body to participate when we do the planning of cracking adhesive, so that the old gap has a buffer when it shortens and expands, so that it will not occur new cracks.

When in situ remediation is carried out, the use of biosurfactants may have some toxicity and impact on the indigenous microbial populations living in them, and in addition, since they can be degraded by microorganisms, their metabolites may be more toxic.

Surfactant has the ability to strongly adsorb on the surface of particles, adding in the processing of pesticide formulations helps to disperse and suspend the particles, and ensure the re-dispersion when adding water to dilute in the spray barrel to prevent the aggregation of particles.

The research on the application of surfactants in the field of disinfection has developed rapidly in recent years, and the types and quantities of related products approved for marketing are constantly increasing.