Caustic soda (Sodium hydroxide – NaOH) is one of the most common chemicals in water treatment, widely used in industrial and domestic wastewater treatment systems. With the ability to neutralize pH, caustic soda plays an important role in industries such as electroplating, textile dyeing, and many other manufacturing industries.
Investing in the construction of wastewater and water supply treatment systems not only ensures compliance with environmental regulations but is also a necessary factor to maintain stable production activities. In particular, caustic soda is considered a highly economical and easy-to-use chemical in neutralizing acidic wastewater.
Overview of Caustic Soda (Sodium Hydroxide)
Sodium hydroxide (NaOH), also known as Caustic soda, has the molecular formula NaOH. This is a strong chemical compound, which exists in common forms such as solid (pellets, flakes, granules) or liquid solutions (32%, 45%, 50%). NaOH has the ability to absorb CO2 from the air, so it needs to be kept tightly closed.
Physical and chemical properties
- Physical properties:
- White, odorless.
- Melting point: 323°C, boiling point: 1.388°C.
- Easily soluble in water, generating a lot of heat when dissolved.
- Chemical properties:
- Reacts with acids and acid oxides to form salt and water: NaOH+HCl→NaCl+H2ONaOH + HCl \rightarrow NaCl + H2O
- Reacts with CO2 to form carbonate salt: 2NaOH+CO2→Na2CO3+H2O2NaOH + CO2 \rightarrow Na2CO3 + H2O
- Reacts with salts and strong metals to form new compounds.
Applications of Caustic Soda in Water Treatment
1. pH adjustment
Caustic soda is used to raise the pH of wastewater or groundwater to a suitable level. Increasing the pH facilitates physicochemical reactions such as coagulation, flocculation and metal precipitation.
2. Support for microbiological treatment
In the treatment of wastewater with high COD content, pH adjustment with caustic soda helps create an optimal environment for the growth of microorganisms in UASB tanks or Aerotanks.
3. Descaling and cleaning pipes
NaOH has the ability to clean dirt and scale in pipes, increasing the efficiency of the treatment system.
Common Forms of Caustic Soda
Caustic soda flakes
- NaOH content: 99%.
- Properties: Strong hygroscopicity, generates heat when dissolved in water.
- Specification: 25kg bag.
- Application: Often used in electroplating and dyeing industries.
Caustic soda granules
- NaOH content: 99%.
- Characteristics: Odorless, soluble in water.
- Specification: 25kg bag.
- Application: Suitable for underground water and wastewater treatment with high accuracy requirements on pH concentration.
Liquid caustic soda (NaOH 50%, 45%, 32%)
- Characteristics: Liquid, opaque white, viscous.
- Specifications: Contained in tank trucks or plastic drums from 30kg to 30.000kg.
- Application: Used directly in large industrial wastewater treatment systems.
More information
How to Use Caustic Soda
- Caustic soda can be added directly to wastewater or diluted before use.
- To ensure efficiency, it is necessary to use a metering pump such as a piston pump or diaphragm pump to control the dosage.
- Should be combined with automatic pH measuring device for high accuracy.
Storage and Safety Precautions
Preservation:
- Store in a cool, dry place, away from heat sources and polluted environments.
- Store in PP bag with PE layer or sealed bottle.
Safety Note:
- Inhalation hazard: Causes lung damage, suffocation.
- Skin and eye contact: Causes burns or serious injury.
- Ingestion: May lead to gastric rupture due to exothermic reaction when exposed to body water.
Epilogue
Caustic soda plays an indispensable role in wastewater and groundwater treatment. With outstanding advantages such as ease of use, high efficiency in pH adjustment and ability to support microbial treatment, caustic soda is increasingly trusted in many industries.
Loc Thien Chemical Company Proud to be the leading caustic soda distributor in Vietnam, committed to providing quality products, clear origin and competitive prices. If you are looking for buy caustic soda, Contact now for detailed advice and best support!
CONTACT US
- Head office: 452/6B Provincial Road 10, Binh Tri Dong Ward, Binh Tan District, Ho Chi Minh City
- Phone: 028 6269 5669 – 028 6269 5662
- Hotline: Phone: (+84) 979 891 929
- Email: locthien@locthien.vn
- Website: locthien.vn - hoachatcoban.net
Warehouse office branch:
- Warehouse 1: Phuoc Hung Hamlet, My Xuan Ward, Tan Thanh District, Ba Ria - Vung Tau
- Warehouse 2: Phuoc Thai, Phuoc Binh Ward, Long Thanh, Dong Nai
- Warehouse 3: Tan Dong Hiep B Industrial Park, Di An, Binh Duong
- Warehouse 4: Hoa Khanh Industrial Park, Da Nang
- Warehouse 5: O Mo Industrial Park, Phuoc Thoi Ward, O Mon District, Can Tho City
- Warehouse 6: Dai Dong - Hoan Son Industrial Park, Tri Phuong Ward, Tien Du, Bac Ninh
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