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Chitosan is the product of the deacetylation reaction of chitin. The degree of deacetylation (DD) determines the content of amine groups (NH2) on the macromolecular chain, and the increase in DD will cause the chitosan to protonate due to the protonation of amines. In the dilute acid solution, the charged groups increase, and the charge density of polyelectrolyte increases, which will inevitably lead to changes in its structure, properties and performance. So far, the research on the properties of chitosan dilute solution has neglected the influence of DD value on the equation.

Chitosan is made from chitin as a raw material and then refined. It is insoluble in water, soluble in dilute acid, and can be absorbed by the human body. Chitosan is a primary derivative of chitin. Its chemical structure is a high-molecular alkaline polysaccharide polymer with cations, and has unique physical and chemical properties and biological activation functions.

In recent years, reports at home and abroad have mainly focused on adsorption and flocculation. There are also reports that chitosan is a good sludge conditioner, and its use in activated sludge wastewater treatment can help to form good activated sludge bacterial micelles and improve treatment efficiency. However, there is no report on its influence on the activity of microorganisms in activated sludge and its enhanced biological action mechanism.

In the chitin molecule, due to the interaction of its internal and external hydrogen bonds, an ordered macromolecular structure is formed. The dissolution performance is very poor, which limits its application in many aspects,

However, chitosan, the product of deacetylation treatment of chitin, has greatly improved its solubility due to the presence of a large amount of free ammonia in its molecular structure. It has some unique physical and chemical properties and physiological functions. It is used in agriculture, medicine, food, and cosmetics. , Environmental protection has broad application prospects.