From Conventional CFU to CDFU Cyclonic Dissolved Gas Flotation: Technical Innovation and Performance Breakthrough

In oily wastewater treatment, conventional cyclonic flotation (CFU) has long been constrained by low efficiency and poor stability. Developed by SINOKLE, the CDFU(compact cyclonic dissolved gas flotation) integrates centrifugal separation, ultra-fine bubble generation and other core technologies to achieve a revolutionary upgrade in flotation. The following analysis covers technical principles, performance comparison and practical applications.
1. Innovation in Technical Principles
Conventional CFU relies on mechanical shearing or jet nozzles to generate bubbles (300-1000 μm in diameter), needs a retention time of 3 minutes, achieves only 60%-80% oil removal, and performs poorly on emulsified oil and fine suspended solids (<10 μm).

CDFU breaks through these limits with three innovations:
Tangential inlet design: creates a high-speed swirling field (centrifugal acceleration increased 3 times), strengthening collision and coalescence between oil droplets and bubbles.
Ultra-fine bubble technology: the dissolved gas pump generates uniform 5-30 μm bubbles (conventional bubbles are 5-100 μm), increasing specific surface area 10 times and markedly improving adsorption capacity.
Dual-zone flotation structure: a central cylinder separates the inner and outer flotation zones, raising space utilization by 50% and shortening retention time to 1-5 minutes.

2. Performance Comparison: CDFU — a decisive all-round advantage

For particularly difficult wastewaters such as refinery sour water (16% oil content) and fracturing flowback fluid, CDFU can hold effluent oil stably at ≤100 mg/L while cutting sludge by 90%.
3. Application Cases and Validation of Advantages
Refining: a tank farm black water treatment project (3,600 m³/d) at a petrochemical company in Xinjiang adopted CDFU and achieved 110% shock-load resistance while cutting energy consumption by 40%.
Oilfields: in fracturing flowback treatment, CDFU was combined with catalytic ozonation (CDOF) to achieve rapid gel breaking and viscosity reduction at low temperature (20 °C), cutting chemical dosage by 70%.
Offshore platforms: the skid-mounted design suits space constraints; at one offshore oilfield, CDFU equipment service life exceeded 5 years, with maintenance costs only one-third of conventional CFU.

CDFU applied in petrochemical black water treatment

4. Future Outlook
CDFU technology has been validated in numerous oily wastewater treatment projects at home and abroad, and its "high-efficiency, low-carbon, modular" features are driving the industry from chemical treatment toward physical purification. With intelligent upgrades such as IoT remote monitoring, CDFU is expected to become a benchmark technology for industrial wastewater treatment worldwide.