DJ-Q2020 Electrolytic Ozone Generator

II. Low-pressure Electrolytic Ozone Generator

The low-pressure electrolysis ozone generator is a medium-to-small-sized device with relatively modest output, yet it produces ozone at an exceptionally high concentration. Ozone concentration is typically expressed in volume percentage—a unit widely accepted internationally. For corona discharge ozone generators using air as the source, the ozone concentration ranges from 1% to 3%; for those using oxygen as the source, the concentration ranges from 2% to 6%. In contrast, low-pressure electrolysis ozone generators can achieve concentrations of 18% to 20%. Domestically, concentrations are commonly reported in units of mg/L or mg/m³. Specifically, corona discharge ozone generators using air as the source typically produce concentrations of 10–40 mg/L, while those using oxygen as the source yield concentrations of 20–80 mg/L. Electrolysis-based ozone generators that use pure water as the source can produce concentrations as high as 250–280 mg/L. Low-pressure electrolysis ozone generators are highly favored by both domestic and international customers due to their low energy consumption, excellent safety, and stable performance. Notably, the ozone they produce contains neither nitrogen oxides nor volatile organic compounds—substances identified by national environmental monitoring agencies as pollutants.

The main advantages of the new low-pressure electrolytic ozone generator are: it produces ozone with high purity and high concentration (a weight ratio of 18-20% at low pressure, and 1-3% at high pressure); the ozone produced contains no nitrogen oxides (especially no carcinogenic substances such as nitric oxide or nitrogen dioxide); it does not generate electromagnetic interference; it has low overall operating costs and excellent safety performance; its operation is unaffected by environmental conditions (including ambient humidity up to 90% and ambient temperature); and it can operate continuously for extended periods.

The new low-pressure electrolytic ozone application in water treatment has the following notable features: 1. Since ozone is extracted from pure water, the ozone produced contains no impurities such as nitrogen oxides (especially no carcinogenic substances like nitrogen dioxide), does not generate nitrites, and thus does not affect water quality. 2. It boasts a humidity resistance of up to 90%. The modular electrolysis principle is highly resistant to moisture and will not break down even under humid conditions. 3. The electrodes operate at a low voltage of 3–5V, consume minimal power, can run continuously, offer excellent safety performance, and have an exceptionally long service life. 4. The ozone concentration produced is high (18–20% for low-pressure ozone, 1–3% for high-pressure ozone). For the same amount of ozone introduced into the water, this method achieves a significantly higher ozone concentration in the water. 5. Overall operating costs are low; for the same water flow rate and achieving the same ozone concentration, the cost is less than half that of high-pressure equipment.

III. Selection of Ozone Generators

Currently, most ozone generators in China employ a high-frequency, high-voltage corona discharge method that uses air as the feedstock to produce ozone. A serious issue arising from this type of ozone generator is the excessive production of nitrogen oxides. Since air contains more than 78% nitrogen, when exposed to a high-voltage discharge environment, nitrogen molecules dissociate into atoms, which then preferentially combine with oxygen to form highly toxic nitrogen oxides (NOx). In particular, the NOx produced by air-source ozone generators using the high-voltage corona discharge method mainly consists of nitrogen dioxide (NO₂). Specifically: 1. NO₂ is poorly soluble in water and readily penetrates the lower respiratory tract, reaching deep into the lungs. Once it reaches the alveoli, NO₂ slowly dissolves in body fluids, forming nitrous acid, nitric acid, and their respective salts. These substances, in the form of nitrite and nitrate ions, enter the bloodstream via the lungs and are distributed throughout the body, causing damage to organs such as the kidneys, liver, and heart. Moreover, NO₂ itself exerts a strong irritant and corrosive effect on lung tissue, leading to pulmonary edema. 2. Impairment of immune function: Long-term exposure to NO₂ not only reduces the phagocytic capacity of alveolar macrophages but also inhibits the formation of antibodies in the serum, thereby compromising the body’s immune defenses. 3. Carcinogenic effects: Animal experiments have shown that NO₂ has both promoting and carcinogenic effects. Additionally, the ozone generator market in China today is flooded with a wide variety of products, many of which are of inconsistent quality. Many people mistakenly believe that as long as ozone is produced, everything is fine, overlooking the fact that nitrogen oxides—often referred to as the "silent killer"—pose significant health risks to humans. This is especially true for low-priced ozone generators, whose simple configurations and inferior materials make them far more likely to generate large amounts of nitrogen oxides (NOx) alongside ozone. Therefore, choosing a high-quality ozone generator is extremely important.

Meanwhile, in water treatment, nitrogen oxides dissolve in water to form nitrites when ozone is used for water purification or during routine maintenance of plumbing systems. The most important mineral form of nitrogen is nitrate. This leads to excessive levels of nitrites, which can further interact with contaminants in plumbing pipes or with hormones and antibiotics present in the pipes, generating additional harmful substances in the process. Such interactions are detrimental to the purification and disinfection of the water circulation system.

IV. Advantages of Low-Pressure Electrolytic Ozone Generation

Performance and Features of Low-Pressure Electrolysis

1. The resulting ozone concentration, by weight, is several times higher than that produced by the high-voltage corona method (reaching up to 20%).

2. The ozone gas produced contains no nitrogen oxides and no carcinogenic substances.

3. It employs the low-voltage electrolysis principle (3–5V), eliminating any risk of electrical hazards. It does not generate electromagnetic waves or noise, and when operating alongside other precision instruments, it causes no interference.

4. The ozone generator uses pure water as its gas source and does not require an oxygen source or any additional equipment external to the high-pressure ozone unit during operation, making it easy to operate and safe and reliable.

5. Low electrode wear, continuous operation capability, and an exceptionally long service life.

6. It is unaffected by the working environment and temperature, with a humidity resistance of up to 85%.

7. The pure water self-circulation cooling system eliminates the risk of overheating caused by continuous operation of the equipment.

8. Due to the high ozone concentration generated, using this method with the same amount of ozone introduced into water can achieve a higher ozone concentration in the water.

Performance Indicators and Comparison of DJ-Q Type Electrolytic Ozone Generators vs. Air (Oxygen)-Discharge Ozone Generators