Advantages of advanced oxidation technology coupled with ozone and micro nano bubble generators

The advanced oxidation technology coupled with ozone (O3) and micro nano bubble generators is a synergistic process that utilizes the special physicochemical properties of micro nano bubbles to enhance ozone mass transfer efficiency and oxidation ability, thereby efficiently degrading pollutants in water or waste gas. Compared to single ozone oxidation or traditional aeration technologies, this coupled technology has significant advantages in pollutant removal, energy consumption control, and process adaptability, as follows:

1、 Significantly improve the mass transfer efficiency and utilization rate of ozone

The core characteristics of micro nano bubbles are that they have a large specific surface area, slow rise rate, and high solubility (diameter range of about 10 nm~50 μ m). Ordinary large bubbles quickly float and rupture in water, with an ozone escape rate of up to 60% to 80%; Micro nano bubbles can stay in water for several minutes to tens of minutes, and the smaller the bubble diameter, the larger the specific surface area (at the same volume, the specific surface area of micro nano bubbles is hundreds of times that of millimeter sized bubbles).

The ozone dissolution efficiency is significantly improved. Micro nano bubble generators can cut ozone gas into tiny bubbles, greatly increasing their contact area with water or exhaust gas, and significantly reducing the mass transfer resistance of ozone from gas to liquid phase. Experimental data shows that the ozone dissolution rate of the coupled process can reach over 90%, far higher than the 30% to 40% of traditional aeration, greatly reducing ozone waste and lowering operating costs.

2、 Enhance the generation of hydroxyl radicals (· OH) and improve oxidation ability

The "cavitation effect" of micro nano bubble rupture: Micro nano bubbles gradually contract due to the pressure difference between the inside and outside during their ascent, ultimately leading to rupture. At the moment of rupture, an extreme environment of high temperature (about 5000 K) and high pressure (about 50 MPa) will be formed locally, accompanied by strong shock waves and the generation of free radicals.

Under the action of cavitation effect, a large number of strong oxidizing free radicals are generated synergistically. Not only do ozone molecules decompose into hydroxyl radicals (· OH, with an oxidation-reduction potential of 2.80 V, much higher than the 2.07 V of ozone), but water molecules in water also decompose into · OH. At the same time, the gas-liquid interface of micro nano bubbles can enrich ozone and pollutant molecules, increasing the collision probability between free radicals and pollutants by several times, achieving efficient mineralization of difficult to degrade pollutants (such as polycyclic aromatic hydrocarbons, pesticide residues, sulfur-containing and nitrogen-containing organic compounds), rather than just converting pollutants into intermediate products.

3、 Wide processing range, adaptable to complex pollutant systems

The coupling technology combines the strong oxidizing properties of ozone and the mass transfer advantages of micro nano bubbles, and can treat various types of pollutants:

Water pollution: phenols, dyes, heavy metal complexes in industrial wastewater, recalcitrant organic compounds in domestic sewage, trace organic pollutants in drinking water (such as disinfection by-products precursors);

For stubborn pollutants that are difficult to degrade by single ozone oxidation, such as antibiotics and perfluorinated compounds, this coupling technology can achieve efficient decomposition through non selective oxidation of OH.

4、 Reduce energy consumption and medication costs, operate more economically

Reducing the amount of ozone added is due to the significant improvement in ozone utilization efficiency. When achieving the same treatment effect, the ozone added by the coupled process is only 50%~70% of that of a single ozone oxidation, directly reducing the energy consumption and equipment load of the ozone generator.

5、 Easy to operate, no secondary pollution, strong compatibility

The process is simple and the operation and maintenance are convenient. The micro nano bubble generator can be directly integrated with existing ozone treatment systems without the need for large-scale renovation; There are no complex control parameters during the operation of the equipment, and only the adjustment of bubble size and ozone dosage is needed to adapt to different water quality/gas flow conditions.

The reaction products without secondary pollution risk are mainly harmless substances such as CO ₂, H ₂ O, inorganic salts, etc., and will not produce sludge or waste residue; Excessive ozone can naturally decompose into oxygen after the rupture of micro nano bubbles, and will not remain in water bodies or exhaust gases, causing secondary pollution.

This coupling technology can be used in conjunction with other processes such as biological treatment, activated carbon adsorption, membrane separation, etc. For example, difficult to degrade pollutants can be decomposed through coupling technology to improve the biodegradability of wastewater, and then enter the biochemical system for treatment, achieving an efficient combination of "advanced oxidation+biodegradation".

6、 Combining additional functions such as air flotation and sterilization

Micro nano bubbles themselves have the functions of air flotation and sterilization:

During the rising process of bubbles, suspended solids and colloidal particles in the water can be adsorbed to achieve solid-liquid separation, which is equivalent to synchronously completing the dual treatment of "oxidation+air flotation";

Ozone and hydroxyl radicals can destroy microbial cell membranes and nucleic acids, kill bacteria, viruses, algae, etc. in water bodies, and can replace some disinfection processes in sewage treatment and drinking water purification, improving treatment efficiency.