CDFU Technology: An Innovative Solution for High-Concentration Oily Wastewater Treatment
Treating high-concentration oily wastewater has long been a major challenge in industrial wastewater treatment. Developed by SINOKLE, the CDFU(Cyclonic Dissolved Gas Flotation Unit) compact cyclonic dissolved gas flotation technology provides an efficient solution to this problem through innovative technical integration.
Technical Principles and Core Advantages
CDFU technology ingeniously combines centrifugal separation, dissolved gas flotation separation and ultra-fine bubble generation into an integrated treatment unit. Its working principle is to remove oil and suspended solids from wastewater efficiently through the synergy of cyclonic separation and micro/nano bubbles.
CDFU cyclonic dissolved gas flotation workflow diagram
The notable features of this technology include:
High treatment capacity: single-stage oil removal efficiency above 90%, with minimum removable particle size down to below 2 um
Compact design: retention time of only 1-5 minutes and a footprint just 10% of conventional dissolved gas flotation
Stable operation: no filter screens, coalescing plates or other internals inside the unit, so clogging is unlikely and long-term stable operation is ensured
Strong adaptability: highly tolerant of variations in hydraulic load, oil viscosity and oil specific gravity
Practical Application Results
In multiple industrial application scenarios, the CDFU technology demonstrates outstanding performance:
Refining and chemical application: PetroChina Dushanzi Petrochemical desalter wastewater treatment project (2019), capacity 100 m³/h, inlet oil 2000 ppm or less, effluent oil 10 ppm or less;
Sinopec Cangzhou Refining and Chemical desalter wastewater treatment project, capacity 50 m³/h, inlet oil 20,000 ppm or less, effluent oil 50 ppm or less (average).
Oilfield application: a petrochemical desalter and tank-farm black water treatment project in Xinjiang (2023), capacity 150 m³/h, inlet oil 20,000 ppm or less, effluent oil 150 ppm or less;
Congo (Brazzaville) Jiayu oilfield produced water and fracturing flowback deep treatment project (2024), capacity 4,600 m³/d, meeting strict sea discharge standards.
Engineering case of petroleum refining wastewater treatment application
Comparative Technical Advantages
Compared with conventional treatment processes, the CDFU technology offers clear advantages:
Purely physical separation: no chemical dosing required, and the recovered oil is of high quality and can be reused directly
No secondary pollution: no oily sludge (hazardous waste) is generated, eliminating secondary pollution
Significant economic benefits: oil recovery creates economic value and O& M costs are low
Rapid deployment: skid-mounted design supports fast deployment and online implementation
Application Prospects
CDFU technology has been successfully applied in petrochemicals, oilfield production, heavy-oil power generation and other fields, with stable and reliable treatment results. As environmental requirements tighten, the technology shows broad application prospects in high-concentration oily wastewater treatment, providing strong technical support for the green transition and sustainable development of industrial enterprises.
