CDOF Integrated Ozone Advanced-Oxidation Flotation Technology: A Systematic Upgrade from Ozone Dosing to Efficient Reaction
In the treatment of high-COD, high-color, strongly odorous and refractory organic wastewater, ozone oxidation is a commonly used advanced oxidation technology. Ozone has strong oxidation ability and can be used for organic matter chain cleavage, decolorization, deodorization and improvement of wastewater biodegradability. However, in traditional ozone oxidation processes, problems such as low ozone dissolution efficiency, insufficient mass transfer, long reaction time, low ozone utilization and high energy consumption often exist. For complex water qualities such as landfill leachate, chemical wastewater and oilfield composite wastewater, simply "dosing ozone" does not equal efficient oxidation.
SINOKLECDOF 's integrated ozone advanced-oxidation and flotation technology is an integrated process formed around improving ozone oxidation efficiency. This technology organically combines ozone advanced oxidation, homogeneous and heterogeneous catalytic oxidation, cyclonic enhanced mass transfer, hydrodynamic cavitation and dissolved-air flotation, transforming ozone from "entering the water" to "efficiently participating in the reaction", thereby improving COD reduction, color reduction and odor removal.
One of the main bottlenecks of traditional ozone oxidation is gas-liquid mass transfer. After ozone enters the water body in gas form, if the bubble size is large, the retention time is short and the contact area is limited, a large amount of ozone will escape the system before fully reacting, not only increasing operating costs but also bringing safety and environmental risks.CDOFThrough enclosed pressurized reaction, cyclonic enhanced mixing and fine-bubble release, the dissolution and contact efficiency of ozone in water is improved, making the reaction between ozone and pollutants more sufficient.
The second key is catalytic oxidation. Ozone itself has selective oxidation characteristics, and its direct oxidation efficiency for some refractory organics is limited.CDOFThrough the active sites on the catalyst surface, ozone decomposition is promoted, generating strongly oxidizing active species such as hydroxyl radicals, improving the attack ability on refractory organics. Compared with pure ozone oxidation, catalytic ozone oxidation can more effectively promote organic matter chain cleavage, ring opening and mineralization, improving the deep-treatment effect of wastewater.
The third key is the coupling of oxidation and flotation. Some wastewaters produce colloids, fine flocs or oxidation intermediates during ozone oxidation; if not separated in time, they may affect subsequent treatment.CDOFCombining flotation separation with the oxidation reaction allows part of the suspended solids, colloids and scum to be separated during oxidation, making the treatment process more compact.
In terms of technical parameters,CDOF compared with traditional ozone catalytic oxidation, the reaction time can be shortened from the traditional 60-90 min to 10-15 min, and the footprint is only about 1/5 of the traditional process; ozone utilization can reach >=99.98%, and the ozone dosage/COD reduction ratio can be optimized to 0.5-1.2; at the same time, the equipment adopts enclosed pressurized operation, reducing ozone leakage risk and improving safety and automation level.
In the landfill leachate treatment scenario,CDOFCDOF's advantages are more prominent. The MBR effluent of landfill leachate still contains high-concentration refractory organics, with deep color and obvious odor, and conventional biochemical treatment has great difficulty in further degradation. After adoptingCDOF CDOF, COD reduction, decolorization and deodorization can be achieved through multi-stage catalytic ozone oxidation, creating more favorable conditions for subsequent biochemical treatment or compliant discharge.
For composite wastewater such as oilfield produced water, fracturing flowback fluid and drilling waste liquid,CDOFCDOF usually does not undertake the entire treatment task alone, but works withCDFU CDFU, KFM and other technical units in coordination. The front endCDFU CDFU first removes oil and suspended solids to reduce ineffective ozone consumption; the mid-stageCDOF CDOF centrally treats refractory organics, color and odor; the terminal KFM further filters and safeguards. This combined route enablesCDOF CDOF to operate under more suitable influent conditions, improving oxidation efficiency and system stability.
In the Jiayou oilfield project in Congo (Brazzaville), Africa, the influent consists of combined-station wastewater, fracturing flowback liquid and drilling waste liquid; the project adoptsCDFU+CDOF CDOF + KFM combined process, with a treatment scale of 4600 m3/d. The treated effluent meets the marine discharge standard, with petroleum <=0.5 ppm, turbidity <=3 NFU, SS <=3 mg/L and iron <=0.15 mg/L. This case demonstratesCDOF CDOF's mid-stage strengthening role in composite oilfield wastewater systems.
From the perspective of technology application,CDOFCDOF is suitable for scenarios such as landfill leachate, chemical wastewater, metallurgical wastewater, oilfield composite wastewater, coking and refinery deep-treatment wastewater. For wastewater with prominent single high-COD, high-color and high-odor problems,CDOFCDOF can serve as the core deep-treatment unit; for wastewater containing both oil and suspended solids,CDOF CDOF is more suitable as the advanced-oxidation unit in a combined process, together with front-end oil removal and back-end filtration forming a complete treatment chain.
Overall,CDOFCDOF is not a simple ozone-dosing device, but an integrated technology that carries out systematic upgrading around ozone utilization, reaction rate, safe operation and multi-pollutant synergistic removal. Through enhanced mass transfer, catalytic oxidation, enclosed reaction and flotation separation, it improves the engineering application value of ozone advanced oxidation in complex industrial wastewater, providing a more efficient, compact and safe treatment path for high-COD, high-color, strongly odorous and refractory wastewater.
