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Municipal Industry Commercial Photochemistry Resource Recycling Others
A photochemical reaction is a chemical reaction initiated by molecules absorbing photons. The energy of the photon must be at least equal to a certain molecular bond energy to initiate a photochemical reaction. A molecule only needs to absorb a single photon for a photochemical reaction to occur. The energy of a photon (E=hv) is related to the photon's frequency (or wavelength); the shorter the wavelength, the greater the energy.
ONYX has been focusing on photochemical research for 20 years and can scientifically utilize the energy of photons in the 100nm to 400nm range to provide professional services for photochemical reactions of target molecules in water treatment.

Photo-Fenton is an advanced oxidation process (AOP) that combines the traditional Fenton reaction with photochemical excitation. It significantly enhances the oxidation capacity of the Fenton system through ultraviolet irradiation, achieving efficient mineralization of difficult-to-degrade organic pollutants. Its core principle is to utilize light energy to accelerate the circulation of iron ions and promote the generation of hydroxyl radicals (·OH). It offers significant advantages in reducing iron sludge production, increasing reaction rates, and lowering operating costs. It is particularly suitable for treating high-concentration, highly toxic industrial wastewater.

Medium-pressure ultraviolet oxidation (MPUV-Oxidation) is an advanced oxidation technology that uses ultraviolet (UV) light to excite oxidants to generate strong oxidative free radicals (primarily ·OH hydroxyl radicals), effectively degrading organic pollutants in water. MPUV-Oxidation boasts a waste-free production process (no secondary pollution), broad-spectrum performance (suitable for most wastewater treatment), effective treatment of difficult-to-degrade and high-concentration wastewater (up to 300,000 mg/L COD), and significantly improved bioavailability (up to nearly 100%). It is widely used in industrial wastewater pretreatment and advanced treatment.

UV photolysis generally refers to the use of ultraviolet (UV) light to decompose substances, particularly pollutants.
Specific wavelengths of UV light (usually short-wavelength UV-C, such as 254 nm) can directly break the molecular bonds of certain substances (especially organic pollutants), causing a cracking reaction that breaks them down into smaller molecules, free radicals, or ultimately mineralizes them into CO₂ and H₂O. This is known as direct photolysis. It is primarily used for TOC removal in ultrapure water, residual chlorine removal and disinfection prior to RO membranes for purified water, and the decomposition and disinfection of ammonium chloride in swimming pools and water features.


UV/O₃/H₂O₂ (over-ozone photocatalysis) is a highly efficient post-UV-AOP advanced oxidation technology. This method utilizes high-intensity, high-energy ultraviolet light to stimulate H₂O₂ and O₃ to produce highly oxidizing hydroxyl radicals. These hydroxyl radicals oxidize refractory organic matter, causing chain scission and ring opening reactions, effectively reducing COD without causing secondary pollution.
UV/O₃/H₂O₂ (over-ozone photocatalysis) technology offers significant advantages, including strong oxidizing capacity and high mineralization, making it particularly suitable for treating refractory organic wastewater that is difficult to treat using traditional methods.
In practical applications, optimized design (e.g., O₃ and H₂O₂ dosage ratio, UV intensity, reactor configuration, pH control, etc.) is required based on water quality characteristics and treatment objectives, while also considering economic considerations.


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Email:services@onyxepi.com

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