UV-based advanced oxidation processes in wastewater treatment systems
UV AOP (Ultraviolet Advanced Oxidation Process) integrates ultraviolet oxidation with chemical oxidants such as hydrogen peroxide (H₂O₂) or ozone (O₃) to generate hydroxyl radicals for contaminant removal.
What is UV AOP？
Definition of UV Advanced Oxidation Process
UV AOP (Ultraviolet Advanced Oxidation Process) is a water treatment technology that integrates ultraviolet radiation with oxidants such as hydrogen peroxide (H₂O₂), ozone (O₃), or their combination. Under UV irradiation, these oxidants generate highly reactive radicals, especially hydroxyl radicals (·OH).
Hydroxyl radicals exhibit strong non-selective oxidation capability, rapidly attacking complex organic molecules, breaking chemical bonds, opening ring structures, and ultimately mineralizing them into carbon dioxide and water.
How UV Oxidation Water Treatment Works
UV AOP involves several key steps
Oxidant dosing and mixing
Oxidants such as H₂O₂, O₃, or PMS are dosed into the water and thoroughly mixed using static mixers or contact chambers.
UV activation
The water enters the UV reactor, where ultraviolet radiation activates the oxidants through photolysis or catalytic reactions, generating reactive radicals.
Radical oxidation
These radicals rapidly attack pollutants, breaking molecular bonds and degrading large organic compounds into smaller molecules, eventually achieving mineralization.
Residual oxidant control
Residual oxidants must be controlled or removed to prevent downstream impacts. Common methods include further UV decomposition, activated carbon adsorption, or chemical reduction.
What UV AOP Can Remove
Micropollutants and Refractory Organics
UV AOP is particularly effective for PPCPs, endocrine‑disrupting compounds, pesticides, dyes, surfactants, and certain short‑chain PFAS that are difficult to remove by conventional methods.
By permanently degrading these compounds instead of transferring them to another phase, UV AOP reduces long‑term health risks and helps meet stringent discharge and reuse standards.
Microbial Contaminants
UV AOP combines UV disinfection and oxidation, effectively inactivating bacteria, viruses, spores, and chlorine‑resistant pathogens such as Cryptosporidium, Giardia, and Legionella.
This dual inactivation mechanism provides an additional safety barrier compared with UV or chemical disinfection alone.
Reduced Inorganics and Nuisance Parameters
Advanced oxidation converts reduced inorganic species such as nitrite, cyanide, sulfide, Fe²⁺, and Mn²⁺ into higher‑valence, more stable forms that are easier to remove via filtration or precipitation.
At the same time, odor‑causing sulfur compounds, amines, and chromophoric organics are oxidized, improving color and odor to enhance the sensory quality of the treated water.
UVC LED Systems in UV AOP
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Energy-Efficient UV Oxidation
UVC LEDs can switch on immediately without warm-up time, which makes UV AOP systems more responsive and energy-efficient in intermittent or variable-flow operation.
Compact and Modular Design
UVC LED modules are small and modular, allowing reactors to be designed in a more compact way and integrated more easily into existing treatment systems.
Mercury-Free and Sustainable
Unlike traditional mercury lamps, UVC LEDs contain no mercury, which improves environmental safety and simplifies maintenance, handling, and disposal.
Intelligent Monitoring and Control
UVC LED systems can integrate smart sensors and control platforms to monitor operating status, light output, and temperature in real time.
Applications of UV Advanced Oxidation Process
UV AOP is widely used in biopharmaceutical water systems, medical and laboratory pure water, and high‑end industrial process water where stability and safety are critical.
Industrial Wastewater Advanced Treatment
Laboratory & Medical Pure Water
Biopharmaceutical & Healthcare Water
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MASSPHOTON focuses on LED UV‑C and ultraviolet water treatment applications, delivering efficient, compact, and intelligent ultraviolet oxidation solutions tailored to high‑standard water systems.