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Product Overview
The Oilfield Produced Water Compliance Discharge System is a high-efficiency integrated solution independently developed by ZLN Technology Co., Ltd.—a National High-tech Enterprise with over 20 years of membrane separation and industrial wastewater treatment expertise. Tailored for the treatment of oilfield produced water generated during oil and gas extraction, this system addresses the core challenges posed by the wastewater's complex characteristics: high oil content (including dispersed, emulsified, and dissolved oil), high TDS (tens of thousands of mg/L), complex pollutants (suspended solids, hydrocarbons, phenols, sulfides, heavy metals), and variable water quality.
Traditional treatment methods struggle with emulsified oil separation and deep pollutant removal, often failing to meet discharge standards. This system adopts a multi-stage combined process of "pretreatment + deep purification + advanced polishing + optional desalination", integrating membrane separation technologies (ultrafiltration, ceramic membrane, reverse osmosis) with advanced oxidation and physical-chemical treatment. It efficiently removes oil, suspended solids, organic pollutants, and salts, ensuring the treated water fully meets national and local industrial wastewater discharge standards. Widely applied in oilfield development projects, the system also supports reusing treated water as oilfield injection water, achieving dual goals of environmental compliance and resource recycling.
Core Advantages
1. Efficient Oil and Impurity Removal
Adopts a multi-stage oil removal process: oil-water separators/air flotation machines remove 80-90% of free oil; ceramic membrane/ultrafiltration (MWCO 10-50 kDa) intercepts emulsified oil and colloids with an oil removal rate ≥99%, reducing oil content to below 5 mg/L. Suspended solids removal rate reaches ≥98%, effectively protecting subsequent deep treatment equipment.
2. Strong Adaptability to Complex Water Quality
Customizes process configurations for produced water with different characteristics (e.g., polymer flooding, surfactant flooding). Advanced oxidation technologies (ozonation, Fenton oxidation) degrade refractory organic pollutants, reducing COD by ≥80%; optional reverse osmosis (RO) or electrodialysis (ED) modules handle high-TDS water, ensuring stable compliance regardless of water quality fluctuations.
3. Resource Recycling & Cost Reduction
The treated water can be reused as oilfield injection water, reducing fresh water procurement costs by 40-60%. Recovers oil resources from wastewater, creating additional economic value; energy-saving membrane technologies and optimized process design reduce overall operating costs by 30% compared to traditional processes.
4. Corrosion-Resistant & Stable Operation
All wetted parts are made of corrosion-resistant materials (316L stainless steel, ceramic membranes, PVDF) to withstand high-salt, high-corrosive wastewater environments. Equipped with anti-fouling membrane modules and online CIP cleaning systems, extending membrane service life to 2-3 years and ensuring long-term stable operation with low failure rates.
5. Intelligent Control & Easy Operation
Features a PLC automatic control system and touchscreen interface, enabling real-time monitoring and automatic adjustment of key parameters (oil content, COD, TDS, filtration pressure). Supports unattended operation, automatic backwashing, and abnormal alarm functions, minimizing manual intervention and ensuring consistent treatment effects.
Main Features
1. Multi-Stage Integrated Design:
Integrates pretreatment (oil-water separation, coagulation), deep purification (membrane filtration, advanced oxidation), advanced polishing (precision filtration, adsorption), and optional desalination into one system. Simplifies workflow, reduces floor space by 35% compared to traditional split equipment.
2. Advanced Membrane Application:
Uses ceramic membrane and ultrafiltration for deep oil and colloid removal; RO/ED for desalination, ensuring high separation efficiency and stable water quality.
3. Comprehensive Pollutant Removal:
Effectively removes oil, suspended solids, COD, sulfides, heavy metals, and other pollutants, meeting discharge standards (e.g., oil content ≤5 mg/L, COD ≤100 mg/L, SS ≤10 mg/L).
4. Complete Supporting Facilities:
Provides customized process combinations based on pollutant composition and discharge requirements—adds advanced oxidation for high-COD water, desalination modules for high-TDS water, and disinfection units for surface water discharge.
5. Turnkey Service Capability:
Offers one-stop services from on-site water quality testing, process design, equipment manufacturing, installation and commissioning to operator training and after-sales maintenance, ensuring rapid system startup and production.
Technical Parameters
Parameter Category |
Specification Range |
Processing Capacity |
50 m³/h – 500 m³/h (customizable according to oilfield scale) |
Feed Water Characteristics |
Oil content: 100–5000 mg/L; TDS: 10,000–100,000 mg/L; COD: 200–5000 mg/L; SS: 50–500 mg/L |
Key Removal Rates |
Oil: ≥99%; SS: ≥98%; COD: ≥80%; Sulfides: ≥95%; Heavy metals (Cr, Pb, Zn): ≥99% |
Operating Pressure |
Pretreatment: 0.2–0.5 MPa; Membrane filtration: 0.4–1.0 MPa; RO desalination: 2.0–4.0 MPa |
Operating Temperature |
5–45℃ (optimal: 25–35℃) |
Treated Water Quality |
Oil content ≤5 mg/L; COD ≤100 mg/L; SS ≤10 mg/L; TDS ≤1000 mg/L (after desalination); pH 6–9 |
Material in Contact with Product |
316L stainless steel, ceramic membrane, PVDF, corrosion-resistant seals |
Control System |
PLC automatic control + touchscreen; Real-time monitoring of oil content/COD/TDS/SS |
Power Consumption |
1.2–3.0 kW·h/m³ (varies by process configuration) |
Membrane Service Life |
2–3 years (under normal operation and maintenance) |
Floor Space Requirement |
200–1500 m2 (varies by processing capacity) |
Core Components
System Module |
Core Equipment/Technology |
Function Description |
Pretreatment Unit |
oil-water separator, air flotation machine, coagulation tank, precision filter |
Remove free oil, large-particle suspended solids, and emulsified oil; reduce subsequent process load |
Deep Purification Unit |
Ceramic membrane/UF modules, advanced oxidation reactor (ozonation/Fenton), adsorption tower |
Intercept emulsified oil and colloids; degrade refractory organics; adsorb trace pollutants |
Desalination Unit (Optional) |
RO membrane system, ED electrodialysis unit |
Reduce TDS content to meet discharge or reuse requirements |
Advanced Polishing Unit |
Cartridge filter (1–5 μm), activated carbon filter, disinfection equipment (UV/chlorination) |
Remove residual fine particles and trace organics; kill microorganisms for surface water discharge |
Auxiliary Unit |
CIP cleaning system, sludge dewatering machine, pH adjustment tank |
Maintain equipment performance; treat sludge; adjust water pH |
Application Scenarios
1. Oilfield Produced Water Compliance Discharge
Application: Treatment of produced water from onshore/offshore oilfields before discharge into surface water bodies or municipal sewage systems.
Process Solution: Oil-water separation → coagulation → ceramic membrane filtration → advanced oxidation → precision filtration → disinfection.
Value: Ensures all indicators meet national discharge standards; avoids environmental penalties and protects ecological balance.
2. Oilfield Produced Water Reuse as Injection Water
Application: Treatment of produced water for reuse in water flooding oil recovery.
Process Solution: Oil-water separation → UF purification → RO desalination → sterilization.
Value: Reduces fresh water consumption; improves oil recovery efficiency; lowers production costs.
3. High-Salt/High-COD Produced Water Treatment
Application: Treatment of complex produced water with high TDS and COD (e.g., polymer flooding oilfields).
Process Solution: Air flotation → coagulation → UF → advanced oxidation → RO desalination.
Value: Efficiently degrades organic pollutants and removes salts; achieves stable compliance and resource recycling.
Company Profile
With 20+ years of experience in chlorination system manufacturing, ZLN is a certified (ISO 9001, ISO 14001, ISO 18001) original equipment manufacturer (OEM) specializing in water treatment solutions. We offer:
1. Customized package design (AutoCAD, SolidWorks-supported engineering).
2. After-sales services: On-site inspection, electrolyzer refurbishment, and capacity upgrades.
3. Membership in China's Chlorine Committee, ensuring compliance with global industry standards.
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