What are the phenomena in water containing surfactants?

2021-07-13 19:22:47

Biosurfactants meet the requirements of functional food and green food additives, and can be used in functional food. Today and even in the future, biosurfactants will become a widely used food additive.

Biosurfactant is a new technology for remediation of soil contaminated by hydrocarbon and crude oil. For example, plum produced by Pseudomonas aeruginosa has removed a large amount of oil from Alaskan gravel. Van Dyke et al. Found that rhamnolipid produced by Pseudomonas aeruginosa could increase the recovery of hydrocarbons by 25% ~ 70% and 40% ~ 80% respectively from contaminated sand and mud.

Similarly, the recoveries of aliphatic hydrocarbons and aromatic hydrocarbons in sand treated with biosurfactant produced by Pseudomonas aeruginosa were 56% and 73%, respectively.

In the water containing surfactant, due to the solubilization of surfactant, a large amount of oxygen is dissolved in the surfactant micelles formed in the aqueous solution. In this way, the formation of water oxygenates in the surfactant aqueous solution can occur not only at the gas-liquid interface, but also in the water body, which reduces the formation time of water oxygenates, The solubility of oxygen in water is improved.   

Traditional oxidants are usually peroxygenated compounds such as sodium percarbonate, calcium peroxide and Percarbamide, which have the disadvantages of low oxygen release and short action time. Studies by aquatic drug researchers have shown that some surfactants have good oxygenation effect. For example, Gemini based coconut oil betaine can inhibit the excessive reproduction of anaerobic microorganisms in water, and quickly reduce the interfacial tension between water and air, so that a large amount of oxygen in the air can be introduced into water, The level of dissolved oxygen was increased from 1 mg / L to 4-5.5 mg / L.