With the acceleration of industrialization, the issue of wastewater pollution has become increasingly severe. From organic wastewater discharged by chemical industrial parks to antibiotic residues from medical institutions, traditional treatment processes can no longer meet environmental protection requirements.

I. Four Major Wastewater Treatment Process Systems

Wastewater treatment technologies can be categorized into four types based on their principles, each with its own advantages and disadvantages:

Physical Treatment Methods

Representative technologies: Sedimentation, filtration, adsorption

Characteristics: Remove suspended solids, oils, and other substances through physical separation; low cost but unable to decompose pollutants.

Applicable scenarios: Pretreatment or domestic wastewater with simple water quality.

Chemical Treatment Methods

Representative technologies: Coagulation sedimentation, chemical oxidation

Characteristics: Decompose pollutants through chemical reactions, but inefficient for high-concentration, hard-to-degrade organic matter.

Challenges: Prone to producing chemical sludge, which may cause secondary pollution.

Biological Treatment Methods

Representative technologies: Activated sludge process, biofilm process

Characteristics: Utilize microorganisms to degrade organic matter; low operating costs but long treatment cycles.

Limitations: Sensitive to toxic substances (e.g., heavy metals, antibiotics), which can easily cause microbial death.

Advanced Oxidation Processes (AOPs)

Representative technologies: Fenton oxidation, photocatalysis, ozone oxidation

Characteristics: Thoroughly decompose pollutants through strong oxidizing free radicals, particularly effective for hard-to-degrade organic matter.

Key breakthrough: Ozone catalytic oxidation technology has become a rising star in this field due to the introduction of catalysts.

II. Ozone Catalytic Oxidation Technology: The "Magic" of Catalysts

Ozone (O?) itself has strong oxidizing properties, but traditional ozone oxidation faces two major bottlenecks:

Low ozone solubility and poor mass transfer efficiency;

High selectivity of ozone molecules, limiting their ability to decompose certain organic compounds (e.g., chlorinated hydrocarbons).

The emergence of ozone decomposition catalysts has completely changed this situation.

Mechanism of Catalyst Action

Catalysts (e.g., MnO?, CeO?, or supported catalysts) improve efficiency through two pathways:

Catalyzing ozone decomposition: Accelerate the generation of hydroxyl radicals (·OH) from ozone, which have 100 times the oxidizing power of ozone and attack organic matter non-selectively.
O? + H?O → catalyst 2·OH + O?

Adsorption-catalysis synergy: The catalyst surface adsorbs pollutants, increasing the contact probability between ozone and organic matter by 3-5 times.

Types and Innovations of Catalysts

Type Representative Materials Advantages Application Scenarios

Metal oxides MnO?, Fe?O? Low cost, high stability Printing and dyeing wastewater, petrochemical wastewater

Supported Activated carbon-supported TiO? Dual function of adsorption and catalysis Wastewater containing benzene series, antibiotic wastewater

Composite type CeO?-MnO? core-shell structure Strong anti-poisoning ability Electroplating wastewater, pharmaceutical intermediate wastewater

III. Practical Application Cases of Catalysts

Case 1: Treatment of high-salinity organic wastewater in chemical industrial parks

Raw water issues: Contains substances such as aniline and nitrobenzene, with COD (chemical oxygen demand) as high as 5000 mg/L and salinity of 3%.

Traditional solution: Biological methods fail; Fenton method produces large amounts of iron sludge.

Catalytic ozone solution: Using Fe-Cu bimetallic catalyst, ozone dosage reduced by 40%, COD removal rate increased to 92%.

Case 2: Removal of antibiotic residues from pharmaceutical wastewater

Challenge: Cephalosporin antibiotics are difficult to degrade by conventional processes and can easily induce drug-resistant bacteria.

Solution: Using TiO?/graphene composite catalyst under UV-ozone combination, cephalosporin degradation rate reached 99.7%, with a 35% reduction in treatment costs.

IV. Technological Advantages and Future Prospects

Four Major Advantages Driven by Catalysts

High efficiency: Treatment time reduced by 50%-70%, suitable for emergency treatment of high-concentration wastewater.

Broad-spectrum capability: Capable of degrading emerging pollutants such as pesticides, pharmaceuticals, and microplastics.

Environmental friendliness: No secondary pollution; catalysts can be recycled and reused.

Economic efficiency: By reducing ozone usage, treatment cost per ton of water can be controlled at 10-30 RMB.

Future Trends

Intelligent catalyst design: Using AI to predict material performance and develop targeted catalytic materials.

Modular equipment: Integrating catalytic reactors with the Internet of Things (IoT) for remote monitoring and optimization.

The application of ozone decomposition catalysts marks a new stage in wastewater treatment, transitioning from "extensive removal" to "precise targeting of pollutant molecules." With the advancement of the "dual carbon" goals, this technology is expected to become a core weapon for achieving standard discharge of industrial wastewater. For enterprises, choosing an appropriate catalytic oxidation solution is not only a requirement for environmental compliance but also a smart choice for cost reduction and efficiency improvement.