The role of calcium chloride in water treatment

The role of calcium chloride in water treatment

11 Feb,2025

Calcium chloride (CaCl ₂) has multiple functions in wastewater treatment, mainly based on its chemical properties and ionic characteristics. The following are its main applications and mechanisms of action: ---  **1. Phosphorus removal function** -Principle: Calcium ions (Ca ² ⁺) react with phosphates (PO ₄³ ⁻) in wastewater to form insoluble calcium phosphate precipitates (Ca ∝ (PO ₄) ₂), thereby reducing the phosphorus content in water. -* * Application * *: Widely used for chemical phosphorus removal in industrial wastewater or domestic sewage, especially suitable for pretreatment of high phosphorus wastewater. ---  **2. Coagulation and coagulation aid** -Charge Neutralization: Ca ² ⁺ neutralizes the negative charges on the surface of colloidal particles, promotes the aggregation of suspended solids and colloidal particles, and enhances the flocculation effect. -* * Synergistic effect * *: Often used in combination with other coagulants such as polyaluminum chloride and polyacrylamide to improve floc density and settling speed. --- **3. Adjust pH and alkalinity** -Neutralizing acidity: Calcium chloride aqueous solution is weakly acidic and can neutralize alkaline wastewater, adjusting the pH to a neutral range. -Supplementing Calcium Hardness: In softened water treatment, calcium ions are added to balance water hardness and prevent pipeline corrosion. ---  **4. Sludge conditioning** -* * Dehydration performance improvement * *: Adding calcium chloride can change the colloidal structure of sludge, release bound water, and improve the dewatering efficiency of sludge (commonly used in plate and frame pressure filtration or centrifugal dewatering processes). -* * Inhibit Corruption * *: Calcium ions can inhibit some microbial activity and reduce odors during sludge storage. --- **5. Heavy metal removal** -* * Substitution reaction * *: Ca ² ⁺ can displace heavy metal ions (such as Pb ² ⁺, Cd ² ⁺) in wastewater, forming hydroxide or carbonate precipitates. -Co precipitation effect: When used in combination with sulfides or carbonates, it promotes the co precipitation of heavy metals. --- 6. Winter antifreeze and maintenance of fluidity** -Lowering the freezing point: In cold regions, calcium chloride can prevent water in treatment facilities from freezing, ensuring the normal operation of pipelines and aeration tanks. -* * Improve fluidity * *: Reduce the viscosity of sludge at low temperatures, making it easier to transport. **Precautions** -The impact of chloride ions: Excessive addition may lead to an increase in the concentration of chloride ions (Cl ⁻) in the effluent, which may corrode metal equipment or affect the ecology of the receiving water body. -Microbial inhibition: High concentrations of calcium ions may inhibit the activity of microorganisms in activated sludge, and the dosage needs to be controlled. -Cost and alternative solutions: Compared with aluminum sulfate, polyaluminum chloride, etc., calcium chloride has a lower cost, but the appropriate agent needs to be selected according to the water quality target. **Summary** Calcium chloride is a multifunctional agent in wastewater treatment, with functions such as phosphorus removal, coagulation, pH adjustment, and sludge conditioning. However, its application needs to be optimized based on water quality characteristics, treatment processes, and environmental requirements to avoid side effects.

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The use of sodium bicarbonate

The use of sodium bicarbonate

14 Jan,2025

Sodium bicarbonate, commonly known as baking soda, has a wide range of uses. It is mainly used as a neutralizing agent in industrial production and can regulate acidity and alkalinity. In the field of food processing, it is used for making cookies and pastries to enhance taste and texture. In addition, it is also an important buffering agent used to control the concentration of acidic substances. In the field of firefighting, it is used as a fire extinguishing agent. It is also commonly used in the manufacture of cleaning agents, rubber stabilizers, as well as in the production of certain pharmaceuticals and dyes. Due to its excellent chemical properties, industrial grade sodium bicarbonate plays a crucial role in many chemical reactions, promoting smooth production processes. In short, industrial grade sodium bicarbonate plays an important role in multiple fields, promoting the development of industry.

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Price trend of soda ash market in January

Price trend of soda ash market in January

02 Jan,2025

On the supply side, the soda ash market saw a slight decline on January 2nd. The operating rate of the supply side soda ash plant remains high, the market supply of goods is sufficient, the manufacturer's inventory is high, and the sales pressure of soda ash enterprises is relatively high, resulting in a shift in the focus of transactions; The demand for replenishment in the terminal market is not high, and inquiries for soda ash are limited. Enterprises are adopting a wait-and-see attitude, and soda ash prices in some regions are consolidating downward. On the demand side, glass prices remained stable on December 31st, with an average market price of 16.40 yuan/square meter, unchanged from the previous trading day. The glass market equipment has not changed much, the production has remained stable, downstream stocking is not high, the market trading atmosphere is weak, and the glass market is operating steadily and observing. Future forecast: Currently, the utilization rate of domestic soda ash production capacity is high, the inventory of spot soda ash plants is sufficient, and the downstream glass industry prices are stable. However, there is limited support for soda ash demand, and there is a lack of favorable market conditions. It is expected that the soda ash market will operate weakly and steadily after the holiday, depending on downstream market demand.

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Types and characteristics of snow melting agents

Types and characteristics of snow melting agents

12 Nov,2024

Snow melting agent is a chemical substance used to melt road snow. According to different classification methods, snow melting agents can be classified into multiple types. The following are several common types of snow melting agents: 1. Classified by ingredients: Snow melting agents can be divided into chloride type snow melting agents and calcium chloride type snow melting agents. The main components of chloride type snow melting agents are magnesium chloride, sodium chloride, calcium chloride, etc., and the price is relatively low. Among them, chloride type snow melting agents such as a mixture of calcium chloride and sodium chloride can form chloride ions on the road surface in a short period of time, promote the melting of ice and snow, but have certain corrosiveness and are mainstream snow melting agent products on the market. However, long-term use can corrode roads and vehicles. Calcium chloride based snow melting agents that do not contain chlorine have less corrosive effect on roads and vehicles, but are more expensive. 2. Classified by usage: Snow melting agents can be divided into spreading type snow melting agents and spraying type snow melting agents. Spread type snow melting agents are mainly suitable for areas with heavy snow accumulation on roads, and can be evenly distributed on the road surface, but require more manpower and time. Spray type snow melting agents are suitable for larger areas such as airports and squares.

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What are the application areas of calcium chloride？

What are the application areas of calcium chloride？

19 Aug,2024

Calcium chloride, as a common inorganic salt, has a wide range of applications. The following are several main application areas of calcium chloride: 1. Industrial sector Desiccant: Calcium chloride is widely used as a desiccant due to its strong hygroscopicity. It can absorb moisture from gases such as nitrogen, oxygen, hydrogen, hydrogen chloride, and sulfur dioxide, and is also used as a dehydrating agent in the production of alcohols, esters, ethers, and acrylic resins. Refrigerant: Calcium chloride aqueous solution is an important refrigerant used in refrigerators and ice making, which achieves refrigeration effect by absorbing and releasing heat. Antifreeze: In the construction industry, calcium chloride is used as an antifreeze, which can accelerate the hardening of concrete and increase the cold resistance of building mortar, protecting road surfaces and buildings from frost damage. Other industrial uses: Calcium chloride can also be used as a defogging agent for ports, a dust collector for road surfaces, a fire-resistant agent for fabrics, as well as a protective and refining agent for aluminum magnesium metallurgy. In addition, it is also a precipitant for producing lake pigments, used for de ink processing of waste paper, and used as a raw material for producing calcium salts. 2. Food industry Food additive: In the food industry, calcium chloride is widely used as a calcium fortifier, hardener, chelating agent, and desiccant. It can increase the freshness of food, prevent food spoilage, and can also be used for processes such as tofu solidification and vegetable preservation. 3. Pharmaceutical field Calcium supplements: Calcium chloride can be used as a calcium supplement in the pharmaceutical field to treat calcium deficiency symptoms such as fractures and osteomalacia. It is a rapidly absorbing calcium salt that can quickly replenish calcium in the body. Other medical uses: Calcium chloride can also be used to rescue magnesium salt poisoning, treat vitamin D deficiency rickets, osteomalacia, and emergency situations such as cardiac resuscitation. 4. Environmental field Water treatment: Calcium chloride has important applications in the field of water treatment, which can be used to adjust the hardness of water and help remove impurities and insoluble substances from water. At the same time, it can also be used to treat wastewater, improve water quality, and reduce environmental pollution. 5. Other fields Education and Research: In the fields of education and research, calcium chloride is one of the commonly used reagents in laboratories, which can be used as a moisture absorbent, desiccant, and participate in various chemical reactions. Daily life: In family life, calcium chloride can be used as a dehumidifier to absorb excess moisture in the air and maintain a dry indoor environment. In addition, it can also be used to make household items such as candles and soap. In summary, the application fields of calcium chloride are very extensive, covering multiple aspects such as industry, food, medicine, environment, and daily life.

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What are the application areas of calcium chloride

What are the application areas of calcium chloride

19 Aug,2024

Calcium chloride, as a common inorganic salt, has a wide range of applications. The following are several main application areas of calcium chloride: 1. Industrial sector Desiccant: Calcium chloride is widely used as a desiccant due to its strong hygroscopicity. It can absorb moisture from gases such as nitrogen, oxygen, hydrogen, hydrogen chloride, and sulfur dioxide, and is also used as a dehydrating agent in the production of alcohols, esters, ethers, and acrylic resins. Refrigerant: Calcium chloride aqueous solution is an important refrigerant used in refrigerators and ice making, which achieves refrigeration effect by absorbing and releasing heat. Antifreeze: In the construction industry, calcium chloride is used as an antifreeze, which can accelerate the hardening of concrete and increase the cold resistance of building mortar, protecting road surfaces and buildings from frost damage. Other industrial uses: Calcium chloride can also be used as a defogging agent for ports, a dust collector for road surfaces, a fire-resistant agent for fabrics, as well as a protective and refining agent for aluminum magnesium metallurgy. In addition, it is also a precipitant for producing lake pigments, used for de ink processing of waste paper, and used as a raw material for producing calcium salts. 2. Food industry Food additive: In the food industry, calcium chloride is widely used as a calcium fortifier, hardener, chelating agent, and desiccant. It can increase the freshness of food, prevent food spoilage, and can also be used for processes such as tofu solidification and vegetable preservation. 3. Pharmaceutical field Calcium supplements: Calcium chloride can be used as a calcium supplement in the pharmaceutical field to treat calcium deficiency symptoms such as fractures and osteomalacia. It is a rapidly absorbing calcium salt that can quickly replenish calcium in the body. Other medical uses: Calcium chloride can also be used to rescue magnesium salt poisoning, treat vitamin D deficiency rickets, osteomalacia, and emergency situations such as cardiac resuscitation. 4. Environmental field Water treatment: Calcium chloride has important applications in the field of water treatment, which can be used to adjust the hardness of water and help remove impurities and insoluble substances from water. At the same time, it can also be used to treat wastewater, improve water quality, and reduce environmental pollution. 5. Other fields Education and Research: In the fields of education and research, calcium chloride is one of the commonly used reagents in laboratories, which can be used as a moisture absorbent, desiccant, and participate in various chemical reactions. Daily life: In family life, calcium chloride can be used as a dehumidifier to absorb excess moisture in the air and maintain a dry indoor environment. In addition, it can also be used to make household items such as candles and soap. In summary, the application fields of calcium chloride are very extensive, covering multiple aspects such as industry, food, medicine, environment, and daily life.

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