The application field of water treatment agents can be divided into Industrial Water Treatment, Municipal and Drinking Water Treatment, Sewage and Wastewater Treatment, and Seawater Desalination according to the different objects and ways of water treatment of the end customers.

Industrial Water Treatment 

Water treatment agents are mainly used in circulating water cooling systems and industrial boiler water. 

Circulating cooling water is used to cool the used water through the cooling tower, and the whole water system is in a dynamic process of continuous circulation, which belongs to multiple uses. Circulating water cooling systems need to address coalescence, corrosion and microbial issues in lines and equipment. The chemicals used in industrial circulating water treatment mainly include scale inhibitor, corrosion inhibitor, bactericidal and algicidal agent, cleaning agent and pre-film agent.

The common methods of industrial boiler water treatment are water treatment outside the pot and water treatment inside the pot, the main agents used are corrosion and scale inhibitor, oxygen removal agent, feedwater alkali reduction agent, ion exchange agent, regenerant, softener, alkalicity regulator, scale cleaning agent and so on.

Municipal and Drinking Water Treatment

In the process of producing qualified domestic water, appropriate water treatment chemicals must be added to make the water quality of the factory meet the national standard. Key areas to be addressed are algal control (to reduce toxic or odorous algae in reservoirs), flocculation process (to remove suspension and colloidal solids such as clay), softening process (to remove calcium and magnesium salts, especially carbonates and bicarbonates), corrosion control (used to reduce the corrosion of pipelines), and sterilization and disinfection. Municipal and drinking water treatment involved in the water treatment agents are generally bactericidal algaecide, flocculant, corrosion inhibitor and so on.

Sewage and Wastewater Treatment 

If the sewage or wastewater is discharged directly into the natural environment, the pollutants contained in it will pollute the ecological environment, so it is necessary to remove all the pollutants in the sewage. It is usually necessary to combine a variety of sewage treatment methods to achieve layer by layer purification and step by step filtration until the pollutants in the water are completely removed. The water treatment agents involved in sewage treatment are generally flocculant, sludge dehydrating agent, defoamer, chelating agent, decolorizing agent and so on.

Sea Water Desalination

The development of seawater desalination began in the 1960s, and after the development of recent decades, seawater desalination technology has been relatively mature. Among them, distillation method and membrane method have become the mainstream technology. For the membrane process, in order to reduce the impact of scale deposition on the reverse osmosis membrane, it is necessary to add scale inhibitor, detergent, flocculant, scale inhibitor and dispersant to the water. For distillation method, it is easy to produce pot scale and thus reduce the evaporation efficiency. Seawater can be pre-treated to reduce the impact, and polyphosphate, organic phosphoric acid, phosphate-based polycarboxylic acid, etc. can be added to raw water to soften the water quality. Calcium, magnesium ions and other metal ions can be chelated to make it difficult to precipitate, thus preventing the formation of scale.