Achieving 90%+ Oil Removal: How SINOKLE’s Two-Stage CDFU + KFM System Redefines Chemical-Free Wastewater Purification

In fields such as oil and gas chemicals and oilfield extraction, oily wastewater treatment has consistently been both a priority and a challenge for environmental management. Deeply rooted in industrial wastewater treatment technology, Shenzhen Clear Science & Technology Co., Ltd (SINOKLE) has leveraged its independently developed CDFU cyclonic dissolved gas flotation technology and KFM Activated Filter Media filtration technology to create a high-efficiency, stable, and environmentally friendly integrated oily wastewater treatment process, providing an innovative solution to this industry-wide headache.

I. Process Overview: Two-Stage Purification with Step-by-Step Security

The SINOKLE oily wastewater treatment process adopts a combined process flow consisting of "Two-Stage CDFU Cyclone Dissolved Gas Flotation + KFM Activated Filter Media Filtration," achieving high-efficiency, step-by-step removal of pollutants from the collection tank influent to the final reuse or downstream processes.

The wastewater first enters the primary CDFU unit to complete the separation of most floating oil, dispersed oil, and suspended solids (SS). It then enters the secondary CDFU unit to further remove emulsified oil and fine impurities. Finally, it passes through the KFM Activated Filter Media Filter for advanced polishing purification, ensuring that the effluent water quality satisfies the requirements for reuse or downstream processes. The slop oil generated during the process is uniformly collected for treatment, and the exhaust gas is routed into a dedicated system, achieving environmental regulation and control across the entire flow.

II. Core Technological Highlights

1. CDFU Cyclone Dissolved Gas Flotation: The "Sharp Weapon" for High-Efficiency Demulsification and Oil Removal

CDFU (Cyclone Dissolved Gas Flotation) technology is the core patented asset of SINOKLE. It creatively couples cyclonic centrifugal separation, ultra-micro/nano bubble generation, and dissolved gas flotation technologies. After the wastewater enters the device tangentially, a high-speed cyclonic flow field is formed, realizing the pre-separation of heavy particles and the enrichment of oil droplets under centrifugal force. Concurrently, the system releases a massive volume of ultra-micro bubbles ranging from 5-30 microns. These bubbles possess a large specific surface area and strong adsorption capacities, enabling them to collide and adhere with emulsified oil droplets highly efficiently. The resulting "bubble-pollutant" complexes rapidly float to the central oil-collection zone, where they are continuously skimmed off.

Compared to traditional air flotation, the CDFU unit requires zero dosing of chemical agents, achieves a single-stage oil removal rate of up to 90% or more, occupies only 1/3 the footprint of traditional processes, and features a skid-mounted design for rapid deployment, making it ideal for various space-sensitive projects. The collaborative action of the two-stage CDFU effectively removes more than 99% of the floating oil, dispersed oil, and most of the emulsified oil in the wastewater, establishing a solid foundation for subsequent advanced treatment.

2. KFM Activated Filter Media Filter: The "Precision Gatekeeper" for Advanced Purification

Serving as the final line of defense in this process, the KFM Activated Filter Media Filter utilizes a silicate-based Activated Filter Media modified via atomic layer deposition (ALD) technology, achieving dual purification through physical interception and charge adsorption. The surface of the filter media undergoes super-hydrophilic modification to form a nano-scale pore structure. Its specific surface area is 300 times that of quartz sand, its filtration precision can reach up to 1 micron, and its interception efficiency for suspended solids is greater than 95%.

The filter media surface naturally carries a permanent negative charge, allowing it to capture charged colloids, fine oil droplets, and certain dissolved pollutants in the water through charge adsorption, effectively solving the traditional filtration equipment pain points of easy clogging and short lifespans. The KFM filter media features an attrition rate of only 0.07‰ and a crushing rate of 0.08%, with a theoretical service life of up to 15 years—far superior to traditional media such as anthracite or emery—thereby drastically reducing O&M costs and equipment replacement frequencies.

III. Process Advantages: High-Efficiency, Green, and Economic

· Outstanding Treatment Performance: The combined process of the two-stage CDFU + KFM can reduce the oil content in oily wastewater to below 5 mg/L and the suspended solids content to below 1 mg/L, satisfying stringent water quality standards such as oilfield reinjection water and industrial reuse.

· Environmentally Controllable Full Process: The entire process adopts nitrogen blanketing/protection, effectively preventing the escape of volatile organic compounds (VOCs). Exhaust gas is uniformly collected and treated, and slop oil is centrally recycled, achieving zero discharge of untreated pollutants.

· Low Operational Costs: Zero chemical dosing of demulsifiers or flocculants is required, drastically reducing chemical consumption. The equipment is highly integrated and operates automatically, minimizing labor costs. The long-life design of the filter media also reduces consumable replacement expenses.

· Broad Application Scenarios: The process successfully adapts to a variety of complex water qualities, including oilfield produced water, refining wastewater, tank farm dewatering drainage, and oily wastewater from power plants. Its modular design allows for flexible combinations based on project requirements to satisfy different treatment scales.