CDOF Ozone Catalytic Oxidation: A New Breakthrough for Sodium Sulfate Wastewater
With the rapid development of industrial production, the chemical, pharmaceutical, dye and pesticide industries generate large volumes of wastewater containing high concentrations of sodium sulfate and other harmful substances. If discharged without effective treatment, such wastewater poses a serious threat to the environment and ecosystems. Therefore, developing an efficient and economical treatment process for sodium sulfate wastewater, achieving both pollution reduction and resource utilization, is essential for sustainable business development and environmental protection.
The complex characteristics of sodium sulfate wastewater call for a technology selected according to the wastewater source, water quality and discharge standards, while strengthening source control and process management. An innovative process — CDOF ozone catalytic oxidation — has shown significant advantages and opens up a new path for the efficient treatment of sodium sulfate wastewater.
CDOF process flow diagram
CDOF (Cyclonic Dissolved Ozone Flotation unit, ozone advanced catalytic oxidation) creatively integrates three core technologies:
1. Advanced ozone oxidation: the strong oxidizing power of ozone (O3) efficiently decomposes organic pollutants in the wastewater;
2. Cyclonic technology: forms a highly efficient hydrodynamic field that strengthens the mixing and mass transfer between pollutants, catalyst and ozone;
3. Dissolved air flotation: generates fine bubbles that attach to and float off the oxidized suspended solids and colloids.
One of the core breakthroughs of the process is the integrated ultra-fine nano-bubble generation technology. Centered on efficient gas dissolution, release and mixing, it produces micro/nano bubbles with diameters below 50 micrometers. These bubbles rise slowly, stay in the water for a long time and dissolve efficiently; they are also self-oxygenating, negatively charged on the surface and rich in strongly oxidizing free radicals, which greatly improves ozone mass transfer efficiency and oxidation performance.
Micro/nano bubble effect demonstration
In practical application, the CDOF process offers multiple advantages:
Efficient and energy-saving: short process flow, simple and compact equipment, small footprint, few main power-consuming devices, low electricity consumption and economical operating costs.
Easy to operate: highly automated, simplifying on-site operation; good capability to adjust to water quality and quantity fluctuations, strong adaptability and shock-load resistance.
Synergy potential: easy to combine with other technologies such as biological treatment, bringing the advantages of each into full play for further improvement of treatment results.
Experimentally verified efficiency: in a sodium sulfate wastewater treatment experiment conducted for a company using the CDOF process, when the ozone dosage reached 1200 mg/L, the influent COD dropped sharply from 1067 mg/L to 470.15 mg/L, an absolute COD removal of 596.85 mg/L, with an ozone dosing ratio (ozone consumed to COD removed) of 2.01. The data fully demonstrates the high COD removal capability of the CDOF process for sodium sulfate wastewater.
With its innovative design philosophy, highly efficient pollutant removal and significant economic and operational advantages, CDOF ozone catalytic oxidation technology provides an efficient and reliable solution to the stubborn industrial problem of sodium sulfate wastewater, and has broad application prospects in advancing the deep treatment and resource utilization of industrial wastewater.
