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sodium Hypochlorite Generator Anode for swimming pool

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sodium Hypochlorite Generator Anode for swimming pool

Sodium hypochlorite sterilizer for swimming pool

Swimming is a sport that integrates entertainment and fitness. And water in swimming pool with health, comfort and safety will bring body enjoyment to swimmers. Since the human body produces a large amount of dirt and secretions during people in the swimming pool water, and various bacteria and pathogenic bacteria can be in the water. So it is necessary to control and kill bacteria the water which is harmful to the human body in swimming pool so as to ensure good transparency to the swimmers and provide the water with healthy, water-free, taste-free, pollution-free health.

At present, the disinfection treatment of swimming pool water mainly includes chlorine disinfection method, chlorine dioxide method, ozone disinfection method, electrostatic sterilization and algae elimination method, and copper sulfate inhibition algae method.

Chlorine disinfection method is a classic water treatment disinfection method. Because it is low price and wide range of sources and it has sterilization ability of wide tables. It has been used for more than 100 years and it is still widely used.

Because of its characteristics of strong oxidation and easy to penetrate cell walls. The main factors of affecting the disinfection of chlorine agents are chlorine content, contact time, pH value, water temperature, turbidity, and the type and quantity of microorganisms in water.

sodium Hypochlorite Generator Anode for swimming pool

In recent years, environmental and safety issues caused by disinfection of chlorine have attracted more and more attention. Because chlorine disinfectants kill bacteria and viruses, they also can form amine chloride and trihalomethane (THM) with urea and organic matter secreted by the human body. The volatility of amine chloride causes a special smell in the indoor swimming pool, which is irritating to human eyes, ears, nose and throat mucosa. THM has been confirmed to be carcinogenic to mice. In 2001, the Environmental Protection Agency (EPA) of US announced that THM is harmful to health and saying that long-term consumption of THM-excess water may cause cancer in the lungs, liver, and central nervous system. THM in swimming pool water can be healthy through human breathing and skin penetration to cause hazards in certain.

In order to reduce the content of ammonium chloride and trihalomethane in swimming pool water and reduce harm, it can be removed by coagulation sedimentation, activated carbon adsorption filtration and the other methods. The above problems can be completely solved by chlorine dioxide or ozone disinfection. In the 1940s, some countries in Europe found that chlorine dioxide was very effective in disinfecting water, but it was not considered because of its complicated manufacturing and high price. In recent years, the researches and applications of chlorine dioxide have been increasing of searching for the new disinfectants to avoid the harmful effects caused by chlorine disinfection. The chlorine dioxide disinfection method has been found as following advantages:

1) It can reduce the formation of chlorinated by-products such as trihalomethanes in water.

(2) When the ammonia content in the water is high, it does not react with ammonia, so its oxidation and disinfection are not affected;

(3)It can kill the pathogenic microorganisms and viruses in the water;

(4) The disinfection effect is not affected by the pH of the water;

(5) After the treatment of chlorine dioxide, the residual chlorine in the water is stable and durable to prevent recontamination.

(6) It can remove the color and smell of water due to strong oxidation, and it does not form chlorophenol odor with phenol.

(7) The removal effect of iron and manganese is better than chlorine.

The swimming pool uses the germicidal generator which quote the advanced water treatment technology in Australia and this equipment provided by AOTI. This kind of technology is accordance with the chlorin generated by electrolyzing water, and use the salt molecules (NaCL) in the water to disinfect the tank. Through adding a small charge on a set of titanium plates inside the cell to produce sodium hypochlorite (NaOCl). In water, sodium hypochlorite dissociates into sodium (NA + ) and hypochlorite (OCl-) ions. Hypochlorite ions and hydrogen ions (H+) form hypochlorous acid (HOCl), which is an active agent that destroys bacteria and algae and oxidizes organic matter. This form of chlorine reactions quickly in the pipeline, leaving only a slight residue in the pool.

Requirements for water quality of swimming pool / hot spring required:

Swimming pool

hot spring

Free  available   chlorine

1.0 - 3.0 ppm

3.0 - 5.0 ppm


7.2 - 7.8

7.2 - 7.8

Total alkalinity

100 - 120 ppm

100 - 120 ppm

Calcium hardness

200 - 300 ppm

150 - 200 ppm

Stabilizer   (cyanuric acid)

30 - 60 ppm

30 - 60 ppm

Total dissolved   solids

< 1,200 ppm

< 1,200 ppm


2500 - 3000 ppm

2500 - 3000 ppm

The selection of anode

The principle of the electrode method for producing sodium hypochlorite is to produce sodium hypochlorite by a homogeneous secondary chemical reaction using a diaphragmless electrolysis. The reaction principle of the anode is to electrolyze sodium chloride (pill) in the swimming pool. During the electrolysis process, sodium hypochlorite is formed. The most suitable salt concentration is 3% to 5%. Plate electrodes and tubular electrodes are the electrodes in the sodium hypochlorite generator usings.

A coated titanium electrode can be used as the anode material. The mixed oxide coated titanium anode has a long service life, and the overpotential of the coated titanium anode is also relatively low. The chlorine evolution current is high, and the energy saving effect is good.

The anodes of our company are highly efficient and have a long service life. It can also be applied to the following special conditions:

• The process of deoxidation (eg pickling);

• Electrolytes operating at high speeds;

• The electrode is reversed.

For the above application conditions, AOTI has developed a special anode product that is very suitable for use in order to improve the efficiency of salt use and extend the life of the anode. The main products are as follows:

•Ruthenium metal oxide coated titanium anode

•Iridium platinum oxide coated titanium anode




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