From Pretreatment to Advanced Purification: Analysis of SINOKLE's Full-Process Electric Desalting Wastewater Treatment Technology
In the production chain of oil refining and chemicals, electric desalting wastewater treatment has always been a "bottleneck" link restricting enterprises' environmental compliance and long-cycle operation. As global crude oil extraction trends toward heavier and inferior quality, the wastewater discharged from electric desalting units shows characteristics of high oil content, severe emulsification, and drastic water-quality fluctuations. Traditional gravity separation, hydrocyclones, and other processes often fall short when facing such complex operating conditions.
As an innovator in oily wastewater treatment, SINOKLE Technology relies on its self-developed high-efficiency coalescing pressure de-oiler andCDFUcyclonic dissolved air flotation technology to build a brand-new electric desalting wastewater treatment system. This article will deeply analyze the limitations of traditional processes and SINOKLE's innovative process engineering practice, providing refining enterprises with a practical technology upgrade path.
1. The Real Dilemma of Traditional Electric Desalting Wastewater Treatment Technology
For a long time, most domestic refineries have used physical methods for electric desalting wastewater pretreatment, mainly including gravity separation, hydrocyclones, and coalescence. However, in actual operation, these technologies have gradually exposed obvious shortcomings.
1. Gravity separation technology. This technology relies solely on the oil-water density difference for natural stratification. Although its operating cost is low, for the large amount of micron-scale suspended particles and stubborn emulsified oil present in electric desalting wastewater, its separation efficiency is extremely low, often requiring very long retention times, and the effluent quality is difficult to guarantee.
2. Hydrocyclone. It uses a centrifugal force field to intensify the separation process and has a small footprint, but in electric desalting wastewater treatment scenarios, because upstream unit operations fluctuate frequently, the influent oil content often changes drastically within a very short time. Under such shock loads, the hydrocyclone's effluent oil content is extremely difficult to stably control within standard limits and easily shocks the subsequent biological system.
3. Coalescence method. Although it uses specific coalescing packing to make tiny oil droplets collide and merge into larger droplets, thereby accelerating float separation and having a certain shock-resistance, once it encounters highly emulsified electric desalting wastewater, the coalescing material is easily polluted or clogged, greatly reducing the de-oiling effect.
2. SINOKLE's Innovative Process: From Single Treatment to Collaborative Operation
To address the pain points of traditional technology, SINOKLE Technology adheres to the combination of technology R&D and engineering practice, and has launched a new process centered on the "high-efficiency coalescing pressure de-oiler" andCDFUthe "cyclonic dissolved air flotation unit", achieving a leap from extensive separation to precise purification in electric desalting wastewater treatment.
1. High-Efficiency Coalescing Pressure De-Oiler: Precise Separation under Pressurized Flow Field
The high-efficiency coalescing pressure de-oiler developed by SINOKLE breaks through the limitations of traditional atmospheric-pressure de-oiling. Through CFD (Computational Fluid Dynamics) simulation technology, the internal flow field of the equipment is deeply optimized; the original bidirectional flow design ensures that the water flow maintains a laminar state even under pressure conditions. This design not only greatly improves oil droplet coalescence efficiency but also significantly shortens the oil-water separation time. The equipment has a compact structure and fully enclosed operation, eliminating the volatilization of foul gases; its operational safety and automation level are both at the industry-leading level, making it an ideal front-end device for treating high-oil-content electric desalting wastewater.
2. CDFUCyclonic Dissolved Air Flotation: The Perfect Fusion of Cyclone and Flotation
To solve the problem of removing residual tiny oil droplets, SINOKLE launched theCDFU(Cyclonic Dissolved Gas Flotation Unit) cyclonic dissolved air flotation device. This equipment creatively couples cyclonic centrifugal separation technology with dissolved air flotation technology into one. In the cyclone section, strong centrifugal force achieves rapid pre-separation of oil, water, and sludge; in the flotation section, by releasing micron-scale micro-bubbles (diameter 5-30 um), they tightly bind with tiny oil droplets and colloidal substances in the water and rapidly float for separation. Compared with traditional flotation,CDFUthe device achieves a single-stage oil removal efficiency above 90%, a suspended solids removal rate exceeding 80%, and occupies only about 1/3 of the footprint of traditional flotation, with extremely strong operational stability, especially suitable for the advanced treatment of complex-composition electric desalting wastewater.
3. Combined Process Route: The 1+1 > 2 Synergistic Effect
In engineering applications, a single process often struggles to meet all challenges. SINOKLE recommends adopting the "high-efficiency coalescing pressure de-oiler +CDFUcyclonic dissolved air flotation" combined process route. First, the high-efficiency coalescing pressure de-oiler removes the vast majority of free oil and large-particle emulsified oil, greatly reducing the wastewater oil content; then, through theCDFUdevice, the residual tiny oil droplets are precisely captured. This staged treatment strategy gives full play to the technical advantages of both devices, not only ensuring stable compliance of the effluent quality but also effectively reducing overall operating energy consumption and chemical costs.
3. Engineering Verification: Successful Application in Large Refining and Petrochemical Enterprises
The advancement of technology ultimately needs to be tested through engineering practice. At present, SINOKLE's electric desalting wastewater treatment process has been successfully applied in several large refineries under Sinopec and China National Petroleum Corporation (CNPC), winning widespread recognition from plant owners.
Taking the electric desalting wastewater treatment project of a petrochemical enterprise in Hebei as an example, the main problem faced by the enterprise was that the raw water treatment system could not withstand high-concentration oil shocks, and the effluent petroleum-class indicators often exceeded the standard. In the technical retrofit project, SINOKLE's "high-efficiency coalescing pressure de-oiler +CDFUcyclonic dissolved air flotation" combined process was adopted. Project operation data show that under extreme conditions with an influent oil content as high as 20,000 mg/L, after system treatment the effluent petroleum-class indicator is stably controlled below 100 mg/L (averaging about 50 mg/L),demonstrating strong shock-resistance performance.
4. Conclusion
Driven by both the "dual-carbon" goal and strict environmental regulations, electric desalting wastewater treatment technology is accelerating toward high efficiency, integration, and intelligence. SINOKLE Technology will continue to deepen its work in the oilfield and refining wastewater treatment field, driving process upgrades through continuous technological innovation, helping refining enterprises solve electric desalting wastewater treatment problems, ensuring the long-cycle safe and stable operation of production units, and jointly creating a beautiful future of green development.
