Overview
Sodium chlorite (NaClO2) is an inorganic compound primarily used as a precursor for chlorine dioxide generation in water treatment. It is a stable white powder under normal conditions but becomes a potent oxidizer when activated. In wastewater treatment, it effectively eliminates pathogens, oxidizes organic contaminants, and controls odors without forming significant trihalomethanes (THMs) like traditional chlorine. Its use is regulated due to its reactive nature, requiring careful handling and dosing systems.
Physical and Chemical Properties
Sodium chlorite decomposes at temperatures above 180°C, releasing oxygen and forming sodium chloride and chlorate. It is highly soluble in water (∼40 g/100 mL at 20°C), with solutions being alkaline (pH ~9-11). When acidified (pH <4), it rapidly converts to chlorine dioxide (ClO2), a gas used for disinfection. This property makes it critical to avoid accidental mixing with acids during storage or transport. Its oxidative strength is comparable to hydrogen peroxide but more selective in reactions.
Main Applications
In wastewater treatment, sodium chlorite is dosed as a solution or activated on-site to produce ClO2, which kills bacteria, viruses, and algae. It outperforms chlorine in removing biofilms and resistant microorganisms like Cryptosporidium. Other industrial uses include bleaching textiles and paper pulp, where it preserves fiber strength better than hypochlorite. It also neutralizes sulfides in odor control systems and serves as a disinfectant in food processing (e.g., poultry washing).
Safety and Storage
Store sodium chlorite in original, sealed containers away from heat, moisture, and incompatible materials (acids, reducing agents, organic matter). Use corrosion-resistant equipment (HDPE, stainless steel 316) for handling. Personal protective equipment (PPE) like gloves, goggles, and respirators is mandatory. Spills require neutralization with reducing agents (e.g., sodium bisulfite) and should never be mixed with absorbents like sawdust, which may combust. Always follow local regulations for hazardous chemical storage.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO certifications and SDS compliance. Technical-grade (78-80% purity) is common for water treatment, while higher grades (≥93%) are used in food applications. Bulk purchases (25 kg bags or 1-ton pallets) reduce costs but require dry storage facilities. Verify batch analysis reports for heavy metal content (e.g., lead <5 ppm). Consider regional logistics; some countries restrict transport due to oxidizer classification.
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