Sodium hypochlorite (NaClO), also known as bleach or liquid chlorine, is widely used in water treatment, disinfection, bleaching, and industrial cleaning processes. While it is highly effective as an oxidizing and disinfecting agent, residual sodium hypochlorite in water or process streams may need to be removed before further treatment, discharge, or product use.
Activated carbon is commonly used for sodium hypochlorite removal because of its strong adsorption capacity and reducing effect. In most applications, coal-based granular activated carbon is the preferred choice due to its stable performance, good mechanical strength, and cost-effectiveness.%20Removal.jpg)
Why Remove Sodium Hypochlorite?
Although NaClO is useful in many industrial and municipal applications, excess residual hypochlorite can cause several problems:
- Corrosion of pipes and equipment
- Interference with downstream treatment processes
- Damage to sensitive materials or products
- Unwanted oxidation reactions
- Safety and environmental concerns
For these reasons, sodium hypochlorite removal is often required before reuse or discharge.
Recommended Activated Carbon: Coal-Based Granular Activated Carbon
For sodium hypochlorite removal, coal-based granular activated carbon is generally selected. This type of carbon is suitable for liquid treatment applications and provides a good balance of adsorption capacity, hardness, and flow resistance.
Recommended Parameters
| Parameter | Typical Specification |
|---|---|
| Product Type | Granular Activated Carbon |
| Raw Material | Coal-based |
| Application | Sodium hypochlorite removal |
| Particle Size | 8×30 mesh or 12×40 mesh |
| Iodine Number | 900–1100 mg/g |
| Hardness | ≥ 95% |
| Ash Content | ≤ 12% |
| Moisture Content | ≤ 5% |
| Bulk Density | 450–550 g/L |
How Coal-Based Granular Activated Carbon Works
When sodium hypochlorite solution passes through the activated carbon bed, the carbon surface reacts with the oxidizing hypochlorite, reducing it to harmless components. At the same time, the porous structure of the carbon helps trap other trace organic impurities that may be present in the liquid stream.
This makes coal-based granular activated carbon highly effective for dechlorination and hypochlorite removal in liquid treatment systems.
Common Applications
Activated carbon for sodium hypochlorite removal is commonly used in:
- Wastewater treatment
- Industrial process water treatment
- Swimming pool water treatment
- Chemical production and purification
- Pre-treatment before sensitive downstream processes
In these applications, activated carbon helps reduce residual oxidants and improve water quality.
Conclusion
Activated carbon is an effective and reliable solution for sodium hypochlorite removal. In most cases, coal-based granular activated carbon is the preferred material because of its strong performance, durability, and cost efficiency.
By selecting the right activated carbon specification, users can effectively remove residual NaClO, protect equipment, and improve the safety and quality of their process water or effluent.
