With the increasing tension of global water resources, the problem of water pollution is becoming more and more serious, the safety of drinking water, as well as the efficiency and environmental protection of water treatment has become the focus of attention of all walks of life. In many water treatment technologies, flocculation and precipitation method as an important means of water purification, widely used in the treatment of various types of water sources. As a cationic polymer flocculant, poly(dimethyldiallylammonium chloride) has gradually become one of the most important chemical agents in drinking water treatment due to its good flocculation performance and environmentally friendly characteristics. In this paper, we will discuss the application of dimethyldiallylammonium chloride in drinking water treatment and its advantages.
1. the basic properties of polydimethyldiallyl ammonium chloride
Poly(dimethyldiallylammonium chloride) is a cationic polymer chemical made of diallylammonium chloride (DADMAC) monomer polymerization. Its molecular structure contains a wealth of cationic groups, these cationic groups make polydimethyl diallylammonium chloride has a strong flocculation. It has the following main features:
Good water solubility: polydimethyldiallylammonium chloride is easily soluble in water, forming a stable aqueous solution, which can strongly interact with suspended and colloidal particles in water.
Strong flocculation ability: it has good cationic chemical properties, which can quickly combine with negatively charged particles in water and promote their coagulation into large particles, forming flocs that are easy to settle or remove.
Wide pH adaptability: It shows good flocculation effect under different pH conditions, and can adapt to the changes of water quality.
Environmentally friendly: dimethyldiallylammonium chloride has good biodegradability and has little impact on the environment.
2. polydimethyl diallylammonium chloride in the drinking water treatment of the principle of action
In the process of drinking water treatment, the pollutants in the water source usually exist in the form of suspended solids, colloidal particles and organic matter, which not only affect the transparency of the water, but also may bring health hazards. The role of polydimethyl diallylammonium chloride in water treatment is mainly reflected in its good flocculation properties. Its action principle includes:
Adsorption and bridging: through its cationic groups and negatively charged particles in the water adsorption, the formation of flocs. The polymer chain structure of poly(dimethyldiallyl ammonium chloride) can connect several particles together through the “bridging” effect, prompting these particles to aggregate rapidly and form larger flocs.
Neutralization: Colloidal particles in water usually have negative charges, and the cationic groups of dimethyldiallyl ammonium chloride can neutralize these negative charges, thus reducing the repulsion between particles and making particles gather into clusters, which is convenient for subsequent sedimentation or filtration to remove.
Promote settlement: through the flocculation of polydimethyl diallylammonium chloride, the particulate matter in the water forms larger flocs, and these flocs have a faster settling speed, which can improve the settling efficiency. In this way, the removal of solid particles in water can be accelerated in the process of water treatment.
3. the application effect of polydimethyl diallylammonium chloride in drinking water treatment
Improve the efficiency of flocculation and sedimentation: in drinking water treatment, polydimethyldiallyl ammonium chloride can effectively remove suspended solids, sediment, and organic matter in the water. After using dimethyldiallyl ammonium chloride as a flocculant, the turbidity of the water is greatly reduced, especially in the treatment of high turbidity water, dimethyldiallyl ammonium chloride shows a high processing efficiency.
Lower dosage: Compared with traditional inorganic flocculants, under the premise of the same treatment effect, dimethyldiallylammonium chloride can be added less, and good treatment effect can be obtained under lower dosage.
Improvement of water quality: dimethyldiallyl ammonium chloride can effectively remove suspended solids, colloidal substances and some microorganisms in the water, improve the transparency and taste of the water, make the treated water cleaner and improve the water quality.
Improvement of treatment efficiency: Due to the good flocculation and settling properties of dimethyldiallylammonium chloride, the treatment efficiency of the settling tank and filtration system in the water treatment process is significantly improved. This means that more water can be treated under the same treatment time and space conditions.
Conclusion
As a cationic polymer flocculant, poly(dimethyldiallylammonium chloride) has shown good application in drinking water treatment. It improves the efficiency of water treatment and water quality through its flocculation effect, and becomes an important tool for solving water pollution and ensuring the safety of drinking water. It has a broad application prospect in drinking water treatment, and is expected to provide more support for the sustainable management of global water resources in the future.