Heavy Oil Power Station Oily Wastewater Treatment
Process Overview
Process Introduction
The water cut (bottom drainage) from heavy oil tank farms at power plants contains high levels of oil and suspended solids, with serious emulsification and blackened water quality. Treatment is required to bring the effluent oil content below the control target of 10 mg/L. This process uses CDFU as the core equipment, combined with an active media filter to ensure the effluent consistently meets the treatment standard.
The water cut from the heavy oil tank farm first enters two-stage CDFUs for oil and suspended solids removal. The recovered oil is discharged into an oil collection tank. The effluent then enters an active media filter for further filtration, stably meeting the treatment standard. The filter is periodically backwashed, and the backwash water is directed to a sludge tank.
Two-stage CDFU cyclone dissolved-air flotation + KFM active media filter — purely physical demulsification and separation, stable effluent oil content below 10 mg/L, high quality of recovered oil.
| Water Quality Parameter | Process Influent | Process Effluent |
|---|---|---|
| pH | 6-9 | 6-9 |
| Oil Content | ≤1500mg/L | ≤10mg/L |
Schematic Diagram of Heavy Oil Tank Farm Wastewater Treatment Process Flow at Power Plant
Technological Advantages
Technological Advantage
Short process flow, high efficiency, strong shock resistance, stable effluent consistently meeting water quality requirements
Chemical-free purely physical demulsification and separation technology, effective and stable demulsification, no oily sludge (hazardous waste) generated
Two-stage cyclone dissolved-air flotation for pre-treatment, strong shock resistance, ensuring stable and reliable downstream process operation
Active media filter with high filtration precision, excellent performance, strong shock resistance, and long filter media service life
Skid-mounted design, small footprint, suitable for space-constrained applications
Fully automated and digitalized operation with remote monitoring capability, minimal manpower required, convenient and cost-effective O&M
Technical Comparison
Technical Comparison
| Comparison Item | Conventional DAF + Membrane/Filter | Two-Stage CDFU + Active Media Filter |
|---|---|---|
| Treatment Effectiveness | Unstable effluent, can only remove part of the emulsified oil | Stable effluent meeting treatment standard, able to remove the vast majority of emulsified oil |
| Chemical Usage | Requires biocides, flocculants, and other chemicals, high operating cost | Purely physical, chemical-free separation, environmentally friendly, low operating cost |
| Stability | Low equipment reliability and automation level, poor adaptability to water quality fluctuations and shock resistance, poor system stability | Fully automated operation, real-time multi-parameter monitoring, excellent adaptability and shock resistance, good system stability |
| Recovered Oil Quality | Partial demulsification, high suspended solids and water content, poor quality | Purely physical demulsification, low suspended solids and water content, high quality, can be directly reused |
| Operating Cost | High energy consumption, requires chemicals, short maintenance cycle, high cost | Low energy consumption, no chemicals, long maintenance cycle, low cost |
| Footprint & Deployment | Conventional DAF tank, large footprint, long construction and installation cycle, many build factors to manage | Skid-mounted equipment, small footprint, short construction, installation and commissioning period (factory pre-assembled and tested) |
Application Cases
Application Case
Oily Wastewater Treatment Project at a Heavy Oil Power Station of an Iron Mine in Guinea
