Breaking Down Five Advantages: Key Technical Points and Before/After Comparison of the WWTP Dissolved-Air Flotation Upgrade Solution
The most effective way to judge whether a process is worth adopting is to break it down into comparable dimensions. SINOKLE's wastewater-treatment-plant flotation upgrade solution is built around two-stageCDFUcyclonic dissolved-air flotation (CDFU) as its core. Its technical specification lists five advantages; this article breaks them down one by one and provides a before-and-after comparison.
I. First-StageCDFU: Purely Physical Demulsification and Separation
First-stageCDFUadopts purely physical demulsification and separation, which is stable and reliable with high oil-removal efficiency; waste oil is recovered, there is no secondary pollution, and no oily sludge (hazardous waste) is generated. This relates to the"demulsification-and-oil-removal"step: it breaks apart and separates emulsified waste oil, while converting oil from"hazardous waste"into"recoverable material".
II. Second-StageCDFU: Only a Small Amount ofPAC
Second-stageCDFUrequires only a small amount ofPACto complete flocculation and separation, with low chemical dosage and scum volume reduced by more than one third; the amount of oily sludge (hazardous waste) generated is reduced and secondary-treatment costs are low. This relates to the"final-polishing-and-flocculation"step: completing the finishing work with as little chemical as possible.
III. Sealed Pressurized Operation
The entire unit operates sealed and under pressure, with no hydrogen sulfide or oil-gas escape, giving a friendly on-site environment that is safe and environmentally sound. This relates to the"safety-and-environment"step, solving the long-standing fugitive-emission problem of conventional open flotation.
IV. Single-Stage Retention Time Less Than5minutes
Single-stage retention time is less than5min, with a small footprint, full automation, easy O&M, short construction period, and online implementation possible. This relates to the"engineering-and-implementation"step: small footprint, high automation, and no need for prolonged shutdown during retrofit.
V. Strong Shock-Load Resistance
Strong shock-load resistance and stable operation, able to withstand large water-quality fluctuations. This relates to the"operational-stability"step, which is especially important for wastewater plants with inconsistent influent quality.
Before-and-After Comparison
Comparison Dimension | Common State of Conventional Flotation | Two-StageCDFUUpgrade Solution |
Demulsification Method | Relies on heavy chemical dosing for demulsification | First stage: purely physical demulsification and separation |
Chemical Dosage | High dosing, rising with water-quality fluctuations | Second stage requires only a small amount ofPAC |
Scum Volume | Large scum volume, high disposal cost | Scum volume reduced by more than one third |
Hazardous-Waste Generation | Prone to generating oily sludge (hazardous waste) | First stage generates no oily-sludge hazardous waste |
On-Site Safety | Open type, hydrogen sulfide/oil-gas easily escapes | Sealed pressurized operation, no escape |
Retention Time and Footprint | Long retention time, large footprint | Single-stage retention less than5min, small footprint |
Implementation Method | Retrofit often requires shutdown | Online implementation possible, short construction period |
Shock-Load Resistance | Water-quality fluctuation easily affects performance | Strong shock-load resistance, withstands large fluctuations |
How to Read the Indicators
Process influent oil content≤500mg/L, suspended solids≤200mg/L, process effluent oil content≤20mg/L, suspended solids≤20mg/L. These figures are both design boundaries and a reference for judging whether an existing flotation system needs upgrading.
Technical Background:CDFUWhat is
CDFUCyclonic Dissolved Gas Flotation Unit) Cyclonic dissolved-air flotation (CDFU) is a patented technology independently developed by SINOKLE, with internationally advanced technical level. It creatively combines cyclonic centrifugal separation, microbubble generation and dissolved-air flotation into one system, achieving efficient, comprehensive removal of multiple pollutants from various difficult wastewaters. It is a new-generation, high-efficiency, compact, sealed and pressurized flotation technology pioneered in China. The coalescing and demulsifying capability in the solution also comes from this multi-mechanism integrated technology architecture.
Applicable Industries and Application Points
In terms of application point, the two-stageCDFUcan serve as the main flotation treatment unit of a wastewater treatment plant, or as a pre-treatment or advanced-treatment unit for oily wastewater. Applicable industries cover oil depots and oilfields, petrochemicals, chemicals, machining, metallurgy and comprehensive industrial-park wastewater treatment, and it is especially suitable for projects with high influent oil content, obvious emulsification and heavy chemical-consumption and hazardous-waste-disposal pressure from existing flotation.
Conclusion
The five advantages are not isolated improvements; rather, they form a combined approach built around"less chemical, less hazardous waste, stable compliance, and easy implementation". To judge whether a flotation upgrade solution is worth choosing, one may as well check it item by item against this list: is demulsification physical, can chemical dosing be compressed, do scum and hazardous waste fall, is the site safe and sealed, and can implementation be done online. Technical routes that answer all of these well are rare. This is also why this solution deserves to be singled out for comparison among similar flotation upgrade technologies.
