A New Process for Oily Wastewater Treatment: Innovative Practice of SINOKLE CDFU Technology
Oily wastewater treatment is a core environmental challenge in the petrochemical, power, marine and other industries. Conventional processes such as gravity separation and air flotation suffer from low efficiency, heavy reliance on chemicals and secondary pollution. SINOKLE's CDFU(compact cyclonic dissolved gas flotation unit) integrates cyclonic centrifugation, ultra-fine bubbles and other technologies, achieving a revolutionary breakthrough in oily wastewater treatment.
1. Technical Principles and Core Advantages
CDFU core lies in combining cyclonic centrifugal separation, dissolved gas flotation and ultra-fine bubble technology (5-30 μm). The wastewater enters the swirl zone tangentially, where centrifugal force rapidly separates heavy suspended solids; it is then mixed with dissolved gas water, and ultra-fine bubbles attach to emulsified oil and fine particles, achieving oil-water separation through physical demulsification. Its advantages include:
High efficiency: single-stage oil removal >90% and suspended solids removal >85%, with effluent oil stably ≤5 mg/L, far exceeding conventional processes (60%-85%).
Zero chemical addition: purely physical demulsification avoids chemical sludge, and the recovered oil can be reused directly, delivering significant environmental benefits.
Compact and energy-saving: retention time of only 1-5 minutes and a footprint one-third that of conventional flotation, suitable for space-constrained sites such as offshore platforms.
CDFU process flow diagram
2. Application Scenarios and Typical Cases
CDFU has been widely applied to desalter wastewater, oilfield produced water, refining wastewater and other fields:
Desalter wastewater: the PetroChina Dushanzi Petrochemical project uses two-stage CDFU, handling 2,400 m³/d with effluent oil ≤10 mg/L and suspended solids ≤5 mg/L.
Offshore platform flowback: CNOOC's Bohai project treats flowback fluid with oil content ≤1,000 ppm; the CDFU delivers effluent oil ≤30 ppm with no sludge generated.
Power plant tank farm wastewater: the purely physical process tolerates water quality fluctuations and offers strong shock resistance, cutting O&M costs by more than 40%.
Two-stage CDFU units applied to refinery desalter wastewater treatment
3. Comparison with Conventional Processes
CDFU significantly outperforms conventional technologies on multiple indicators:
4. Future Outlook
CDFU intelligent upgrades, such as IoT remote monitoring, will further drive the industry's green transition. As environmental standards tighten, its high-efficiency, low-carbon and low-cost features will become the mainstream choice for oily wastewater treatment. Through continuous innovation, SINOKLE is leading the industry's leap from chemical treatment to physical purification.
