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Water treatment agents are widely used in four major fields
- Nov 28, 2018 -

1. Industrial water


Industrial water plays a very important role in the entire national industrial system. At present, China's industrial water accounts for about 80% of urban water use. Among them, the amount of cooling water used in industrial water ranks first, generally above 60%. Industrial water saving is an important part of protecting water resources. Water saving must first start with industrial water. Cooling water has become the primary goal. The main way to save cooling water is to use circulating cooling method and increase the concentration multiple.


Industrial cooling water is generally divided into two types: DC cooling water and circulating cooling water. DC cooling water discharges the water used for cooling directly to rivers and lakes, which is a one-time use, resulting in waste of resources. The circulating cooling water is used for cooling after the used water is cooled by the cooling tower. The whole water system is in a dynamic process of continuous circulation and belongs to multiple uses.


The circulating water cooling system is divided into closed and open type. The cooling water of the open circulating water cooling system is cooled by the cooling tower. During the cooling water recycling process, it will be in contact with the air, the amount of water will change, and the various minerals and ions in the water will be continuously concentrated and increased. Quantify the water and drain the concentrated water. The closed circulating cooling water system uses a closed cooling device. The water flows in the pipe and is not directly exposed to the air. The heat of the return water is taken away by other heat exchange media to achieve the effect of cooling. Circulating water cooling systems need to address the agglomeration, corrosion and microbial issues of pipelines and equipment.


The agents used in industrial circulating water treatment mainly include Beijing Hyde energy scale inhibitor, corrosion inhibitor, bactericidal algaecide, cleaning agent and pre-filming agent.


Industrial boiler water is also an important part of industrial water use. Industrial boilers are a common energy exchange device used to produce steam or heated water. They are widely used in the electrical, mechanical, chemical and other industrial sectors and people's daily lives. According to the steam pressure generated by the boiler, it can be divided into: high-pressure boiler, medium-pressure boiler and low-pressure boiler; according to the flow rate of the boiler, it can be divided into large-capacity (large) boiler, medium-capacity (medium-sized) boiler, and small-capacity (small) boiler.


The water source for industrial boiler water is generally tap water and ground water. The use of untreated water is easy to cause fouling, corrosion and soda water to the boiler. Fouling directly affects the normal circulation of heat transfer and soda, forming corrosion under scale, wasting fuel, shortening the life of the boiler, and causing expansion, deformation or tube explosion accidents in severe cases. Corrosion directly affects the strength of the material, causing cracks, leaks and even explosions in severe cases. The soda and water together directly affect the steam quality, which may cause fouling of superheaters and other steam equipment and even cause safety accidents. Providing qualified water for the boiler is an indispensable means of ensuring safe and economic operation of the boiler. Common methods for industrial boiler water treatment include water treatment outside the pot and water treatment in the pot. The main chemicals used are: corrosion and scale inhibitors, oxygen scavengers, water and alkali reducers, ion exchangers, regenerants, softeners, alkalis. Degree adjuster, detergent, etc.


2. Municipal / drinking water treatment


The production of drinking water is vital to the society. In order to ensure public health and safety, reduce or eliminate the occurrence of water-borne diseases, in the process of producing qualified domestic water, it is necessary to add suitable water treatment chemicals to make the water quality of the factory reach the country. standard. The key points to be addressed are: algae control, reducing toxic or odorous algae in the reservoir; flocculation process, removal of suspended and colloidal solids such as clay; softening process, removal of calcium and magnesium salts, especially carbonates and bicarbonate Salt; corrosion control, used to reduce corrosion of pipes; sterilization and so on.


The water treatment agents involved in municipal/drinking water treatment generally include: Beijing Hyde bactericidal algaecide, flocculant, corrosion inhibitor and the like.


3. Sewage / Wastewater Treatment


From the perspective of water treatment, water is a renewable resource. Waste water typically contains harmful toxins, bacteria, oils, oils, heavy metals, impurities from pharmaceuticals, nutrients, viruses and other impurities. If sewage/wastewater is discharged directly into the natural environment, these pollutants can disrupt the ecosystem and life cycle. To remove all the pollutants in the sewage, it is necessary to combine several separate sewage treatment methods to achieve layer purification and step by step filtration until the pollutants in the water are completely removed. A complete and efficient sewage treatment system is divided into three levels: primary treatment, secondary treatment, and tertiary treatment.


The primary treatment is at the bottom of the whole sewage treatment system, and is mainly used to remove large suspended solids in the water. Generally, the physical decontamination method is adopted, and the larger suspended matter in the sewage is usually adsorbed and removed by using alum or carbon block. After the sewage enters the secondary treatment. Secondary treatment refers to the removal of organic pollutants in the colloidal state and dissolved state by biochemical treatment. The biochemical reaction is used to precipitate organic pollutants in the water. The treated sewage basically meets the emission requirements and can meet the requirements. Reuse for a specific purpose.


The secondary treatment is usually carried out by means of a fluidized bed biofilm process, in which the microorganisms adhering to the filler are self-propagated to form a biofilm to carry out a film in the water, thereby treating the water in the soil. The main principle is to treat the sewage by degrading the organic matter in the water by aquatic organisms.


The third-stage treatment is the highest level of treatment of sewage. The sewage will be decontaminated to the maximum extent in this process. The tertiary treatment is also called advanced treatment, mainly for the organic matter and dissolved salts which are difficult to be biodegraded in the sewage. Dissolved, the advanced treated sewage has good water quality and can be directly used in industrial production. The purpose of sewage treatment is basically realized. Water treatment agents involved in sewage treatment generally include flocculants, sludge dehydrating agents, defoaming agents, chelating agents, decolorizing agents, and the like.


4. Seawater desalination


The development of seawater desalination began in the 1960s. After several decades of development, desalination technology has been relatively mature. Among them, distillation and membrane methods have become mainstream technologies. At present, the international distillation method still dominates the entire desalination market, but its development speed lags behind the reverse osmosis method. Distillation refers to a method of desalination using thermal energy, including multi-stage flash (MSF), multi-effect evaporation (MED), vapor distillation (VC), and the like. Membrane method mainly uses the selective permeability of membrane to carry out salt water separation to achieve seawater desalination, mainly including reverse osmosis (RO) and electrodialysis (ED). The industrial operation of seawater desalination is generally higher than the cost of conventional water resources development and utilization. Desalination costs include energy, pharmacy, equipment, and management fees. In the future, as seawater desalination gradually increases in the share of human production and domestic water, the demand for water treatment chemicals in the desalination field will continue to increase.


For the membrane, during the seawater desalination operation, due to changes in seawater temperature, pH, ion concentration, etc., calcium and magnesium ions in seawater may precipitate carbonates, sulfates, hydroxides, block membrane pores, and reduce membranes. Water permeability, it is necessary to add Beijing Hyde energy scale release agent, Beijing Hyde energy cleaner, flocculant, scale inhibitor and dispersant in the water to reduce the impact of scale deposition on the reverse osmosis membrane. For the distillation method, it is easy to produce scale and reduce evaporation efficiency. It can be pretreated by seawater to reduce the impact. Adding polyphosphate, organic phosphoric acid, phosphinopolycarboxylic acid, etc. to raw water to soften water, calcium and magnesium ions And other metal ions chelate to make it difficult to precipitate and prevent scale formation.


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