In-Depth Breakdown: How CDOF Achieves 99%+ Oil Removal via Hydroxyl-Radical Membrane Breakdown and Ultrafine Nano-Bubble Capture

The purity requirements for product liquids in new-energy battery-material production are becoming increasingly stringent. The emulsified and dispersed oil contained in product liquids (such as nickel sulfate solution, ammonium sulfide solution, and sodium sulfate solution) is a key variable affecting purity and the stability of downstream processes. SINOKLE Technology has independently developed theCDOFintegrated ozone catalytic oxidation-flotation unit, which uses its"oil-removal rate99%+and≤3mg/L"effluent oil content

as hard metrics to enter the industry's field of view. Starting from the technical chain, this article dissects layer by layer the underlying logic of its highly efficient oil removal."I. First, distinguish the"enemy

: why is emulsified oil more troublesome than dispersed oil?

· The oil phase in product liquids exists in two forms:dispersed oil10: suspended as relatively large droplets, typically larger than

· um in diameter, and comparatively easy to separate under gravity.emulsified oil

: extremely small droplet size, and coated with an oil-water interfacial film formed by surface-active substances. This film prevents the oil droplets from coalescing and keeps the oil-water system highly stable, so conventional physical interception means (such as coalescing filter cartridges) are essentially powerless against emulsified oil."Traditional+coalescing deoiling+and"activated-carbon60%~80%filtration——solutions have long hovered at low efficiency, the root cause being the interfacial film of emulsified oil. Coalescing media cannot break the film's stability, and adsorption and filtration are limited by treatment capacity, so the effluent oil content fluctuates widely; frequent cartridge replacement further drives up O&M costs.

II.CDOF technical chain: a three-step breakdown

CDOF(Cyclonic Dissolved Ozone Flotation Unit) the core idea is"first break the membrane, then capture, then separate.".

Step 1: Multi-path catalytic oxidation to generate high-potential hydroxyl radicals. The unit synergistically converts ozone into hydroxyl radicals (OH) through four pathways - homogeneous catalysis, heterogeneous catalysis, hydrodynamic cavitation catalysis, and pressurized catalysis - with high efficiency. Hydroxyl radicals (OH) have an oxidation potential of·OH, oxidation potential2.8V). Ozone utilization reaches as high as99.98%, and the dosing ratio is only1/5~1/2——that of traditional ozone catalytic oxidation technology. For the same oil-removal task, consumption of chemical oxidants drops substantially.

Step 2:·OHoxidative membrane breaking, dismantling the stable structure of emulsified oil. Relying on its2.8Vhigh oxidation potential, the hydroxyl radical rapidly attacks and destroys the oil-water interfacial film on the surface of emulsified oil droplets. Once the film is oxidatively destroyed, the emulsified oil"sheds its armor", loses its stable form, and creates conditions for subsequent physical separation. No chemical demulsifier or flocculant is added throughout the process; it is a purely physicochemical oxidation process that introduces no secondary pollution.

Step 3: Cyclonic dissolved-air flotation with+ultrafine nano-bubbles for highly efficient capture and separation. The destabilized oil droplets are captured in the cyclonic dissolved-air flotation system by ultrafine nano-bubbles smaller than10um in diameter. Compared with traditional micron-sized bubbles, ultrafine nano-bubbles have a larger specific surface area, longer residence time, and a higher collision probability with oil droplets, giving more thorough capture. The oil-laden bubbles rapidly float to the liquid surface, achieving deep oil-water separation. The entire unit operates fully enclosed under pressure, with an effective residence time of less than15minutes, and its treatment efficiency is that of traditional processes (≥90minutes)6times or more.

III. Comparison table: traditional solutions vs. vs CDOF

IV. Case data: how theory is implemented

Case 1: A new-energy raw-material enterprise in Zhejiang——nickel sulfate solution oil-removal pilot test (2023year)

treatment scale24m³/d, with the core equipment being theCDOFintegrated unit (ozone output300g/h). Measured data:

The effluent indicators fully meet downstream process requirements, verifying theCDOFengineering stability and deep oil-removal capability at pilot scale.

Case 2: A new-energy battery raw-material manufacturer——ammonium sulfide solution oil-removal bench test

raw-water oil content400mg/L, ozone dosing250mg/L, effluent oil content reduced to125mg/L, removal rate68.75% (bench-test conditions). This result shows two points: first,CDOFis feasible for treating high-oil-load ammonium sulfide solution; second, the bench-test removal rate did not reach99%, mainly limited by the margin for optimizing dosing amount and process parameters; after engineering scale-up and parameter tuning there remains significant potential for further improvement.

V. Summary

CDOF99%+Achieving a 99%+ oil-removal rate is not a single-point technological breakthrough, but the result of a systematic synergy of"·OHoxidative membrane breaking+ultrafine nano-bubble capture+cyclonic flotation separation": membrane breaking solves the question of"whether separation is possible", nano-bubbles solve the question of"how clean the separation is", and the flotation system solves the question of"how fast the separation is". Together with the99.98%ozone utilization rate, fully automatic unattended operation, and skid-mounted design,CDOFthe unit demonstrates a generational technological advantage in the product-liquid oil-removal scenario for new-energy raw materials, and also provides the industry with a verifiable, replicable engineering path.