CDFU Cyclonic Dissolved Gas Flotation Technology
CDFUCyclonicDissolved-air flotation
A perfect fusion of cyclonic centrifugal separation and dissolved-air flotation (DAF) technology, with CFD-optimized design, a leading high-efficiency oil-water separation device
Product Overview
World-leading compact cyclonic dissolved-air flotation separation technology
What isCDFU？
CDFU(Compact Cyclonic Dissolved Gas Flotation) is SINOKLE's proprietary patented product, which combinescyclonic centrifugal separationanddissolved-air flotation (DAF)throughCFDoptimized design to create a high-efficiency oil-water separator.
After the wastewater mixes with the dissolved-air water, it enters theCDFU, where cyclonic centrifugal force causes micro-bubbles (5-30 um) to rapidly collide with and adhere to oil droplets, forming floating oil.
Working Principle
Perfect synergy of cyclonic centrifugal force and dissolved-air flotation
Dissolved-air Mixing
Wastewater and micro-nano bubbles (5-30 um, D50 about 25 um) are mixed at high shear in the multi-stage dissolved-air pump.
Cyclonic Separation
The mixed liquid enters the flotation tank tangentially, forming a stable swirl field; centrifugal force causes bubbles and oil droplets to collide and aggregate.
Oil-Water Separation
Floating oil rises into the oil-collection cylinder for discharge; clear water is discharged from the bottom, with part recirculated for dissolved-air circulation.
Process Flow
Raw water
Oily wastewater
Dissolved-air pump
Multi-stage dissolved air
Mixer
Collision and adhesion
CDFU
Cyclonic separation
Clear water
Compliant discharge
Product Features
Ultra-high Oil Removal Efficiency
Free oil>=99%, emulsified oil80~90%
Ultra-low Energy Consumption
Energy consumption only10%of IGF, air consumption1~3%
Zero Chemicals
No reagents required; no sludge generated; oil recoverable
Extremely Short Retention Time
Only 1-3 minutes
Compact Skid-mounted
Footprint only1/3
Low Maintenance
Not prone to scaling; liquid-level accuracy+/-5mm
Structural Features
InnovationDual tangential inlets
The dual-tangential-angle design increases swirl velocity and centrifugal acceleration, improving flotation efficiency and shortening retention time.
CoreDual flotation zones
A central cylinder divides inner and outer flotation zones, generating stronger centrifugal force and higher space utilization.
FunctionCyclonic desanding
The conical bottom design uses centrifugal force to fling particles toward the inner wall, preventing sand accumulation.
ValidationCFD Optimization
CFD fine-grained flow-field simulation optimizes component design and ensures swirl stability.
Technical Comparison
CDFUvs. Traditional DAF
| Parameter | Traditional DAF | CDFU |
|---|---|---|
| Retention time | 15~40min | <5min |
| Oil removal efficiency | 60~85% | >90% |
| Removal particle size | >10um | <2um |
| Bubble diameter | Non-uniform | 5~30um |
| Operation mode | Manual / open | Fully automatic / enclosed |
CDFUvs. Mainstream CFU on the Market
| Parameter | SBL | VEOLIA | SIEMENS | CDFU |
|---|---|---|---|---|
| Bubble diameter | >500um | 100~500um | 5~75um | 5~30um TOP |
| Retention time | 0.5~1min | 1~2min | 3~5min | 1~3min TOP |
| Free-oil removal rate | 80~90% | >90% | >=96% | >=99% TOP |
| Emulsified-oil removal | Almost ineffective | Poor effect | 50~70% | 80~90% TOP |
| Chemical reagents | Required | Required | Less | Not requiredOK |
| Oil recovery | Not possible | Not possible | Most | CompleteOK |
| Stability | Low | Low | High | Extremely highTOP |
| Control precision | Low | Low | Low | +/-5mm TOP |
Core Conclusion
CDFUUsing a multi-stage dissolved-air pump to generate ultra-fine bubbles (D50 about 25 um), combined with dual-tangential-water-inlet and dual-flotation-zone designs,zero chemicals,achieves removal of free oil>=99% and emulsified oil80~90%with the highest oil-removal efficiency, lowest cost, and simplest maintenance, making it theoptimal solution for treating oily wastewater from oilfields.。
