Do you know which of the seven commonly used chemicals for water treatment?

"Water Treatment agents (also known as water treatment agents, water treatment Chemicals, Water Treatment Chemicals) are chemical agents commonly required for the disposal of industrial water, domestic water, and wastewater."

The main function is to control the formation of scale and sludge, reduce the corrosion of materials in contact with water, remove suspended solids and toxic substances in water, deodorize and decolorize, soften and stabilize water quality. Water treatment agents are widely used in chemical, petroleum, light industry, daily chemical, textile, printing and dyeing, construction, metallurgy, machinery, medicine and health, transportation, urban and rural environmental protection and other industries, including wastewater and sewage treatment, cooling water and boiler water treatment, seawater and brackish water desalination, membrane separation, biological treatment, flocculation and ion exchange technology required agents.

1. Polyacrylamide (PAM)

Polyacrylamide is a linear polymer. The biggest difference between PAC and PAC is that one is organic and one is inorganic. PAM is a glassy solid at room temperature and can be dissolved in water in any proportion, and its aqueous solution is a transparent liquid, which is generally used in the flocculation process. However, the actual use of PAM is complex. After the optimal amount is determined, it needs to be added in batches, constantly stirred, and completely melted before it can be put into use.

2. Polyaluminum chloride

Polyaluminum chloride (PAC) is a water-soluble inorganic polymer between ALCL3 and AL(OH)3. This product has a strong bridge adsorption performance. During the hydrolysis process, physical and chemical processes such as coagulation, adsorption and precipitation occur, which are generally used in the coagulation process.

PAC comes in a variety of colors, such as white, pale yellow, golden, brown, tan and coffee. According to different raw materials and processes, the PAC produced has different colors, of which white has the highest purity and the highest price. Light yellow is more high-end, often used for drinking water treatment; Gold is widely used and moderately priced; The rest are used in special environments such as industry.

3. Alkali tablets

Caustic soda, also known as sodium hydroxide, is an inorganic compound that is mainly used to adjust the PH value, because caustic soda is a strong alkaline substance, and conventional sewage is mostly acidic. It is mainly used in the air floating pool or regulating pool, and a reasonable PH environment can also avoid the phenomenon of sludge floating. In addition, caustic soda can filter heavy metal ions to a certain extent by precipitation. Caustic soda is also one of the common chemicals used in sewage treatment.

4. Biological antibacterial agent

Biological agents refer to the target microorganisms (effective bacteria) through industrial production and reproduction, the use of porous substances as adsorbents (such as peat, vermiculite) made of live bacteria preparations, adsorption of bacteria fermentation fluid. Generally liquid, powder, particles, etc. Microbial supplementation for biological treatment in wastewater treatment.

5. Carbon source

Nutrients that contain carbon and can be used by microorganisms for growth and reproduction are collectively referred to as carbon sources. We often have sugars, fats, organic acids, etc. The carbon source is equivalent to food for microorganisms, a carbon shelf that provides them with energy and synthetic products.

6. Citric acid

Citric acid is an important organic acid. It is colorless crystal, odorless, has a strong sour taste, easily soluble in water. It is mainly used for backwashing of MBR system, which can dissolve the salt compound dirt on the surface of MBR film.

7. Sodium hypochlorite

Sodium hypochlorite is an inorganic compound, which is mainly used in bleaching, industrial wastewater treatment, textile, manufacturing and many other fields. In water treatment, it is used as water purifier, fungicide, disinfectant and backwash of organic pollution of MBR membrane.

01. Application field

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. 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, removal of suspended and colloidal solids such as clay; Softening process, removal of calcium and magnesium salts, especially carbonate and bicarbonate; Corrosion control, used to reduce the corrosion of pipelines; 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. 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.