The sodium hypochlorite electrolytic cell is the core reaction unit for on-site generation of sodium hypochlorite disinfectant, typically employing an undivided (membrane-free) structure. The cell body is commonly fabricated from UPVC or PVDF engineering plastics, offering excellent resistance to strong alkalis and hypochlorous acid corrosion. Inside, the anode features a titanium-based Mixed Metal Oxide (MMO) coated electrode, providing high chlorine evolution activity and a service life of 5-8 years, while the cathode consists of pure titanium plates. During operation, a 3%–5% dilute brine solution is fed into the cell for electrolysis, producing a sodium hypochlorite solution with an available chlorine concentration of 8–10 g/L. Byproduct hydrogen.
gas is forcibly vented through the top outlet. Structurally, cells are categorized into tubular types-compact and suitable for low-to-medium chlorine output-and plate types, which offer modular parallel configuration ideal for large-scale water treatment plants. Characterized by a current efficiency ≥60% and salt consumption ≤6.0 kg per kg of available chlorine, these systems are widely used in municipal water supply, hospital wastewater treatment, and swimming pool disinfection.
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