The "Speed Purifier" of Industrial Wastewater:CDFUA Deep Dive into Cyclonic Dissolved Gas Flotation Technology

In the field of industrial wastewater treatment, the efficient separation of oily wastewater has always been a technical challenge.CDFU(Cyclonic Dissolved gas Flotation Unit) compact cyclonic dissolved gas flotation technology, independently developed by SINOKLE Technology Co., Ltd., is a revolutionary hybrid separation device that is leading a new trend in oily wastewater treatment.

This article takes a deep look at the working principle and unique technical construction of this "purely physical" breakthrough.

1. What Is CDFUTechnology?

CDFUIt is a highly efficient oil-water separation device that organically integratescyclonic centrifugal separation technology, dissolved gas flotation separation technologyandultra-fine bubble generation technologyinto a single unit. It is mainly used to treat industrial wastewater containing dispersed oil, emulsified oil and suspended solids (SS), and is especially suited to petroleum refining, oilfield produced water and oily wastewater from power plants.

2. The Core Breakthrough: The Magic of Ultra-Fine Bubbles

CDFUThe key to the technology lies in the quality of the bubbles it produces.

1. Generation method: the unit uses a specially designed multi-stage impeller cyclonic dissolved gas pump, producing micro- and nano-scale bubbles through high-pressure, high-speed shearing.

2. Bubble size: the visible micro-bubbles produced are only5-30 micronsin diameter (median particle size about 25 um), far smaller than the 100-500 micron bubbles produced by conventional flotation.

3. Physical demulsification: because these bubbles are extremely small and evenly distributed, they have an exceptionally high collision probability and surface tension, and can rapidly adhere to and tear open the protective film at the oil droplet interface, achievingpurely physical demulsification, removing the vast majority of emulsified oil without adding any chemical agent.

3. Working Process: A Perfect Collision of Cyclone and Flotation

CDFUThe treatment process generally consists of the following stages:

1. Tangential entry and cyclone formation: the wastewater to be treated is mixed with dissolved gas water carrying large numbers of ultra-fine bubbles, and enters thetangentiallycyclone separation zone along the tank wall.

2. Centrifugal separation of heavy matter: under the powerful centrifugal force, the water flow accelerates in its rotation, and heavy suspended solids such as sand and silt are flung toward the tank wall and quickly settle to the bottom.

3. Synergistic flotation zone: the mixture then enters the flotation separation zone. Under the stable cyclone, ultra-fine bubbles collide violently with oil droplets and fine suspended matter and adhere to them, forming flocs with a density lower than water.

4. Ultra-fast rise and discharge: the flocs carrying pollutants rapidly gather toward the center of the cyclone and rise, and are discharged from the oil outlet at the top; the purified clear water flows out from the bottom, and part of it can be recirculated for reuse.

4. Unique Technical Construction

CDFUThree innovative designs that set it apart from ordinary flotation equipment:

• Dual tangential inlet design: produces greater rotational speed and a more stable cyclone, helping bubbles and oil droplets coalesce rapidly toward the center.

• Dual flotation zone design: an internal central cylinder divides the tank into inner and outer flotation zones, refining the internal flow field, effectively preventing oil droplets from being carried out with the effluent and improving space utilization.

• Conical cyclone de-sanding design: the conical structure at the bottom of the central cylinder maintains the cyclonic state, so that sand particles do not easily accumulate and are easier to discharge periodically.

5. Core Generational Advantage: Why Choose CDFU?

Compared with conventional flotation technology, CDFU delivers a "dimensionality reduction strike":

• Ultra-fast treatment: residence time is only1-5 minutes(conventional processes require 15-40 minutes), improving treatment efficiency by 3-8 times.

• High-efficiency compliance: single-stage oil removal efficiency >90%, suspended solids removal rate >80%, and the oil content of the effluent can be stably controlled at an extremely low level.

• Zero chemicals, zero sludge: purely physical treatment eliminates at the source the "aged oil" and secondary pollution (oily sludge) caused by chemical agents.

• Extremely compact: skid-mounted and modular design meansa footprint of only 1/3 to 1/5 that of conventional systems, ideal for space-constrained retrofit projects or offshore platforms.

• Intelligent and reliable: few moving parts, low O&M cost, integrated automatic control system, supporting remote monitoring andunattended operation.

Conclusion

CDFUWith itshigh efficiency, fast flow rate, low energy consumption and environmental friendliness, the technology has become the preferred solution for oily wastewater treatment in the petrochemical and power industries. Through its continuous exploration of the limits of physical separation, SINOKLE provides strong technical support for the green and low-carbon transition of industrial enterprises worldwide.