The sodium hypochlorite generator is a system designed and manufactured by our company, which produces sodium hypochlorite disinfectant solution on-site through electrolysis of diluted saline solution. This product directly converts sodium chloride and water into effective chlorine via electrochemical methods, aiming to provide a disinfectant preparation solution for water treatment processes such as disinfection, sterilization, algaecide, and oxidation. It offers on-site preparation, relatively high safety, and convenient operation and management, serving as one of the common alternative technologies for chlorine-based disinfection.
- Structure and Working Principle
- Core structural composition
The system typically adopts a skid-mounted modular design, primarily comprising the following core units:
- Electrolysis system (core): Composed of electrolysis power supply, electrolytic electrodes, and electrolytic cell. The electrodes typically use titanium substrates coated with special catalytic coatings (stabilized anode DSA). The design of the electrolytic cell affects electrolysis efficiency and lifespan.
- The salt solution and saline preparation system comprises a salt solution tank, filtration unit, dosing device, and precision metering pump, designed for preparing and delivering diluted saline solution at specified concentrations.
- Rectifier and control cabinet: Provides stable DC power for electrolysis, with integrated PLC or smart controller to enable automatic control of the entire preparation process, concentration adjustment, data recording, and safety interlock.
- Storage and dosing system (optional): includes sodium hypochlorite storage tanks and dosing pumps, used for temporary storage of the final solution and precise dosing at the application point.
- Working Principle
The system operates on a membrane-free electrolysis technology, with the core reaction occurring within the electrolytic cell.
- Preparation of saline solution: Dissolve industrial-grade table salt (NaCl) in softened water or tap water, then filter and adjust to a low-concentration saline solution (typically with a concentration range of 2.5%-3.5%).
- Electrolysis process: The prepared dilute saline solution is quantitatively fed into the electrolytic cell. Under the influence of direct current, an electrochemical reaction occurs, with the main product being sodium hypochlorite (NaClO) solution. The overall reaction equation can be simplified as: NaCl + H₂O + electrical energy → NaClO + H₂↑.
- Product Collection and Addition: The generated sodium hypochlorite solution (typically with an effective chlorine concentration of 0.6%-1.0%) is transferred to the finished product storage tank and subsequently dosed into the water body to be disinfected via metering pumps.
- On-site preparation ensures safety: It enables immediate production and use of disinfectants, eliminating transportation and storage risks associated with hazardous chemicals such as liquid chlorine. Additionally, it reduces the degradation of available chlorine in commercial sodium hypochlorite solutions and minimizes storage-related issues.
- The raw materials are readily available, and the operating costs are relatively controllable: the primary raw materials are table salt and water, which are easily procured. The operating costs mainly consist of electricity consumption and salt consumption, and can be economically evaluated based on local electricity prices.
- Disinfection efficacy and environmental friendliness: The mechanism of sodium hypochlorite disinfection is similar to that of liquid chlorine, ensuring reliable disinfection effects. The preparation and usage process pose relatively low risks of generating by-products such as organochlorine compounds (e.g., trihalomethanes), demonstrating superior environmental friendliness.
- Fully automated operation: The system automatically adjusts chlorine production based on water flow or residual chlorine signals, enabling on-demand preparation and precise dosing with high automation and user-friendly operation.
- Durability of key components: The device's anode is made of ruthenium-plated titanium, while the cathode plate is constructed from pure titanium. Under suitable water quality and operating conditions, the electrodes exhibit relatively long service life.
- Main technical parameters
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Parameter item
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Description / Reference Range
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effective chlorine production
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Standard Series: 50 – 5000 g/h (or higher, customizable)
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Saline concentration
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Recommended range: 2.5% – 3.5% (i.e., 25-35 g/L)
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effective chlorine concentration of product
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0.6% – 1.0% (approximately 6000-10000 mg/L)
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DC power consumption
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3.5 – 5.0 kWh/kg of effective chlorine (depending on electrode efficiency and brine concentration)
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salt consumption
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~ 3.0 kg/kg available chlorine (theoretical value approximately 1.5, actual content with loss)
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cooling-down method
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Electrolytes typically require external circulation cooling or internal cooling to maintain an appropriate electrolysis temperature.
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navar
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PLC-based automatic control with functions including flow ratio tracking, residual chlorine closed-loop control, and fault alarm.
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- Typical Application Fields
This device is designed for water treatment applications requiring safe and reliable disinfection.
- Tap water disinfection: Disinfection of water leaving small and medium-sized waterworks (e.g., in villages, residential areas, and factories) and water in distribution networks.
- Wastewater and reclaimed water disinfection: Disinfection of effluent from municipal wastewater treatment plants and reclaimed water facilities to meet discharge or reuse standards.
- Industrial circulating water treatment: sterilization and algaecide for circulating cooling water systems in power plants, chemical plants, paper mills, etc.
- Disinfection of swimming pools and water features: Water treatment and disinfection for swimming pools, water parks, and landscape water bodies.
- Aquaculture and Agriculture: Disinfection of aquaculture water, disinfection of agricultural product processing equipment, etc.
- Medical and public health: hospital wastewater disinfection, epidemic prevention and disinfection in public places.
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