How Do We Solve the Refining Wastewater Problem? SINOKLE Has a New Answer

I. Industry Background

With the rapid development of integrated refining and petrochemical projects in China, wastewater treatment has become a critical constraint on the industry's green development. Statistics show that domestic refining enterprises generate more than 1 billion tons of wastewater annually, containing large amounts of petroleum-derived pollutants, emulsified oil, suspended solids and other harmful substances. In 2026, national wastewater discharge standards were tightened further; conventional treatment technologies face even greater challenges, and refining enterprises urgently need efficient, energy-saving and environmentally sound new wastewater treatment solutions.

II. Wastewater Treatment Difficulties

Refining wastewater treatment faces multiple technical difficulties:

High degree of emulsification: oil droplets in refining wastewater are fine and emulsified, making them hard to remove effectively with conventional separation technology

Complex composition: the wastewater contains large amounts of refractory organics, benzene series compounds, phenols and other toxic and harmful substances

Wide water-quality fluctuations: changes in production conditions cause sharp swings in both flow and quality, demanding high process adaptability

Strict discharge standards: environmental requirements are increasingly stringent, and conventional processes struggle to meet limits consistently

III. Shortcomings of Conventional Treatment Technologies

Conventional wastewater treatment technologies have clear shortcomings:

Flotation technology: large bubble sizes give poor removal of emulsified oil; the equipment is bulky and occupies a large area

Chemical demulsification: requires large doses of chemical reagents, carries high operating costs and easily causes secondary pollution

Biological treatment: imposes high demands on influent quality, needs a long start-up period and struggles with water-quality fluctuations

Membrane separation: suffers severe membrane fouling, high maintenance costs and poor operational stability

IV. SINOKLE's New Processes and Technologies

Independently developed by SINOKLE Technology Co., Ltd., CDFU cyclonic dissolved air flotation technology and CDOF ozone multi-stage catalytic oxidation technology provide an entirely new solution for refining wastewater treatment.

1. CDFU Cyclonic Dissolved Air Flotation Technology

Core technology: an organic combination of cyclonic separation + micro-nano bubbles + dissolved air flotation

Working principle: produced water enters the unit via a lift pump and forms a stable flow field under cyclonic action; floating oil and suspended solids rise rapidly under the action of micro-nano bubbles and are automatically discharged via liquid-level control, while treated water leaves through the bottom outlet

2. CDOF Ozone Multi-Stage Catalytic Oxidation Technology

Core technology: an organic combination of advanced ozone catalytic oxidation with flotation

Applications: advanced wastewater treatment, decomposition of refractory organics, decolorization and deodorization, disinfection and sterilization

V. Features and Advantages of the New Technology

Comparison item / Conventional flotation technology / SINOKLE CDFU technology: bubble size, millimeter scale vs. micro-nano scale; separation efficiency, 60-70% vs. above 90%; equipment volume, large vs. reduced by 50%; operating energy consumption, high vs. reduced by 20%; secondary pollution, chemical reagent residues vs. purely physical separation

Core technical advantages:

Purely physical separation process with no chemical reagents and no secondary pollution

Micro-nano bubbles give a high probability of bubble-droplet collision

The cyclonic field generates strong centrifugal force for high separation efficiency

Compact equipment structure with a small footprint

Modular design that can be flexibly combined according to treatment capacity

Automatically controlled operation that is simple to operate and maintain

VI. Application Cases

Case One: Wastewater treatment project at a petrochemical enterprise

Treatment scale: 2,000 m³/d

Influent quality: oil content 500-2,000 mg/L, severely emulsified

Treatment results: effluent oil content <10 mg/L, suspended solids <20 mg/L, consistently meeting the standard

Case Two: Oilfield produced-water treatment project

Treatment scale: 5,000 m³/d

Technical scheme: CDFU + filtration combined process

Treatment results: effluent quality meets reuse standards, enabling resource utilization of produced water

VII. Summary

With environmental requirements growing stricter and the dual carbon goals advancing, refining enterprises face unprecedented challenges in wastewater treatment. Centered on technological innovation, SINOKLE's independently developed cyclonic dissolved air flotation and ozone multi-stage catalytic oxidation technologies offer the industry a reliable technical solution through their efficiency, energy savings and environmental performance.