Some surfactants have good oxygenation

2022-10-31 16:22:32

Alkyl polyglycoside surfactant, synthesized from renewable natural fatty alcohol and glucose, is a new type of non-ionic surfactant with comprehensive performance. It has the characteristics of both common non-ionic and anionic surfactants, high surface activity, good ecological security and solubility, and is internationally recognized as the first choice of "green" functional surfactant.

However, it is similar to the traditional surfactant, which is usually strongly alkaline and has poor cleaning ability as a non-ionic surfactant. Most alkyl polyglycoside surfactants have high viscosity, and the appearance is viscous liquid or semi-solid (active substance content is about 50%), which is easy to be thickened. Because the price is higher than the traditional surface activity, and the detergency is slightly inferior, it is more than AES, CAB and other combinations.

Oxygen increasing principle of surfactant: after adding surfactant in aquaculture water, the saturation solubility of oxygen in aquaculture water can be increased. According to the hydrate formation theory and the double membrane theory, since the solubility of oxygen in water is very small, the water oxygen compound in water generally first forms at the gas-liquid interface, and then slowly diffuses from the gas phase to the liquid phase.

In the water body containing surfactant, due to the solubilization of the surfactant, a large amount of oxygen is dissolved in the surfactant micelle 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, reducing the formation time of water oxygenates and improving the solubility of oxygen in the water body.   

The traditional oxygenators are usually peroxides such as sodium percarbonate, calcium peroxide and percarbamide, which have the disadvantages of low oxygen release and short action time. The research of aquatic drug researchers has shown that some surfactants have good oxygenation effect. For example, the use of dicotyledonous betaine can inhibit the overgrowth of anaerobic microorganisms in water, rapidly reduce the interfacial tension between water and air, so that a large amount of oxygen in the air can be introduced into the water, and the dissolved oxygen level can reach a high level of 4~5.5 mg/l from a low dissolved oxygen level of 1 mg/l.