SINOKLE CDOF: Reshaping the Efficiency and Cost of High-Difficulty Wastewater Treatment with Multi-Catalytic Oxidation
In industries such as petroleum refining, landfill leachate, chemicals and pharmaceuticals, high-concentration refractory organic wastewater has long been a core challenge of environmental governance. Such wastewater typically has high COD, severe emulsification, strong toxicity and poor biodegradability. Conventional processes often rely on Fenton oxidation, single-stage ozone oxidation or membrane concentration, which not only involve complex flows and high operating costs but also generate large amounts of sludge or concentrate, creating a new treatment burden.
As discharge standards tighten and cost-reduction pressure on enterprises grows, the industry is gradually shifting from a "compliance-oriented" approach to one that balances efficiency and cost. Against this background, drawing on years of experience in high-difficulty industrial wastewater treatment, Shenzhen SINOKLE has launched CDOF (Cyclonic Dissolved Ozone Flotation), an integrated ozone multi-catalytic oxidation and flotation technology that systematically restructures the ozone oxidation system to achieve efficient pollutant removal and simultaneous optimisation of operating costs.
1. Restructuring the Technical Path: Multi-Synergy for Efficient Degradation
CDOF is not a simple enhancement of conventional ozone oxidation, but a deep coupling of ozone advanced oxidation, cyclonic mass-transfer intensification and dissolved-air flotation, achieving coordinated "reaction + separation" within a single system.
Under the action of the catalyst, ozone decomposes rapidly at surface active sites, generating highly reactive oxygen species centred on hydroxyl radicals, accompanied by non-radical oxidation pathways that make pollutant degradation more complete. The high-intensity turbulent environment created by the cyclonic structure greatly improves gas-liquid contact efficiency, allowing ozone to dissolve more fully and participate in the reaction; micro-nano bubble technology further strengthens this process by increasing specific surface area and extending residence time, significantly raising ozone utilisation and releasing large numbers of radicals as bubbles collapse, reinforcing the oxidation reaction.
At the same time, the flotation unit simultaneously removes suspended solids, colloids and reaction products, sparing the system the multi-stage "oxidation + sedimentation/filtration" flow of conventional designs and making the whole train more compact and efficient. The synergy of multi-stage catalytic oxidation, cavitation effects and fluidised reaction continuously degrades pollutants through multiple pathways within a short time, ensuring stable treatment performance.
2. Core Performance Advantages: Higher Efficiency and Lower Cost Achieved Simultaneously
Through the synergy of multiple mechanisms, CDOF shows significant advantages in operating efficiency and economics. System ozone utilisation can reach over 99.98%, and the ratio of ozone dosage to COD degradation is controlled between 0.5 and 1.2, markedly lower than conventional processes, reducing the energy consumption and operating costs of ozone generation at source. Overall operating costs can be reduced to one third to one half of conventional ozone oxidation processes.
CDOFOzone Multi-catalytic ozone oxidation flotation applied to wastewater treatment at an oilfield in Africa
The improvement in reaction efficiency is equally striking. CDOFIt compresses the conventional 60–90 minute oxidation reaction time to under 15 minutes, greatly shortening the treatment cycle and reducing the footprint to about one fifth of the original — an advantage that stands out in upgrading and space-constrained projects.
In terms of equipment and operation, the system uses a sealed pressurised structure with DCS/PLC fully automatic control, enabling real-time adjustment of ozone dosing, reaction pressure and operating status for stable, unattended operation. This not only lowers labour costs but also effectively avoids the safety and environmental risks of ozone leakage. In addition, the equipment uses a skid-mounted integrated design that is compact and quick to install, allowing rapid commissioning and benefit delivery.
3. Long-Term Operating Advantages: Stability Combined with Low Maintenance Costs
To address the problems of catalyst deactivation, scaling and blockage in conventional catalytic oxidation, CDOF uses a proprietary heterogeneous catalyst with a matching backwash and regeneration system, fundamentally improving system stability. The catalyst has a high specific surface area and good anti-fouling performance, operates stably under both acidic and alkaline conditions, and maintains long-term activity through on-line regeneration, with a service life of more than 5 years, greatly reducing consumable replacement frequency and maintenance costs.
In terms of environmental compliance, CDOF requires no dosing of auxiliary chemicals such as Fe²⁺ or H₂O₂, avoiding the large volumes of hazardous iron sludge produced by conventional Fenton processes, and generates no high-cost by-products such as membrane concentrate. Sludge production is significantly reduced and essentially no secondary pollution is formed, effectively avoiding hazardous waste disposal costs and potential environmental risks and completing the shift from "compliant treatment" to "green operation".
4. Engineering Application Value: Reliability Proven Across Multiple Scenarios
At present, CDOF technology has been engineered in multiple high-difficulty scenarios including landfill leachate, refining wastewater, oilfield produced water and fracturing flowback fluid, demonstrating good treatment results and operating stability.
In landfill leachate projects, CDOF can reduce the COD of MBR effluent from about 1300 mg/L to below 400 mg/L while significantly lowering colour and eliminating odour, creating the conditions for subsequent biological treatment or compliant discharge. In refining and oily wastewater treatment, its synergy of emulsified oil breakdown and organic degradation effectively improves the overall treatment efficiency and shock resistance of the system. Under complex water quality conditions such as fracturing flowback fluid, CDOF it can also achieve polymer chain scission and viscosity reduction, significantly reducing the difficulty of downstream treatment.
Conclusion
As environmental standards keep rising while enterprises face cost pressure, conventional wastewater treatment processes are increasingly showing a dual bottleneck in efficiency and economics. SINOKLE's CDOF technology, through systematic innovation in multi-catalytic oxidation and intensified mass transfer, optimises reaction efficiency, treatment performance and operating cost together, providing a more competitive solution for high-difficulty industrial wastewater treatment.
In the future, as application scenarios continue to expand and the technology keeps iterating, CDOF it is expected to create value in more complex water treatment fields and drive the industry towards greater efficiency, lower cost and greener development.
