This Phase II project for comprehensive oilfield wastewater treatment in Congo, Africa, handles wastewater primarily composed of combined station wastewater (4,000 m³/d), fracturing flowback fluid (1,750 m³/d), and drilling waste fluid (250 m³/d).

To achieve compliant discharge of the oilfield wastewater and address the specific characteristics of fracturing flowback fluid at this Congo oilfield, the project adopted — after consultation with the client — a combined treatment process: "CDFU Cyclone Dissolved Air Flotation + Coagulation Sedimentation Tank + CDOF (Ozone Catalytic Oxidation DAF Integrated Unit) + Terminal CDFU Cyclone Dissolved Air Flotation + KFM Modified Media Filter."

The CDOF (Ozone Catalytic Oxidation DAF Integrated Unit) integrates ozone multi-stage oxidation, cyclone dissolved air flotation, and coagulation in a single unit, effectively removing suspended solids and colloids from the wastewater.

The CDFU (Cyclone Dissolved Air Flotation) utilizes large quantities of ultra-fine micro-bubbles to efficiently and rapidly remove free oil, emulsified oil, and suspended solids from the wastewater. Flotation effluent then enters the KFM (Active Media Filter) for further oil and suspended solids removal.

Final effluent from the KFM modified media filter meets discharge standards and is transferred to a marine discharge buffer pond for settling, then discharged to sea via a subsea pipeline.

This project is a landmark engineering achievement for Sinokle in the field of oilfield wastewater treatment in Central Africa, fully validating the high efficiency and stability of the CDFU + CDOF + KFM three-stage process for large-scale oilfield produced water treatment, and laying a solid foundation for the company's further expansion in the African oil and gas market.