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The Evans Oil-Water Separator is engineered as a robust pretreatment module to remove free oil, settled solids and heavy contamination from wash water before downstream filtration or biological treatment. With a three-compartment V-bottom design and marine-grade aluminum construction, it offers high-efficiency separation for industrial wash bays, fleet maintenance, oil & gas sites and more.
By leveraging the difference in specific gravity between oil and water, the OWS creates optimal conditions for oil to rise and solids to settle. Both gravity separators (like API models) and coalescing separators principles inform its design, ensuring consistent performance.
How It Works
- Inlet & Settling: Contaminated wash water enters the first compartment where heavy solids and larger particulates drop out via the V-bottom design.
- Oil Separation: Floating oil rises to the top where a manual oil skimmer and decanter remove the oil layer before water moves downstream.
- Gravity Discharge & Optional Pumping: After separation, treated water flows by gravity to discharge or can be directed via an optional float-activated pump.
- Downstream Integration: Cleaned water then enters a filtration system like the Evans Mechanical Filtration System (EMF) or the Evans Bio System (EBS) for further industrial wash water treatment or recycling.
Specifications & Key Features
- Marine-grade aluminum construction for durability and corrosion resistance
- Three-compartment V-bottom design to enhance solid settling and oil separation
- Manual oil skimmer with decanter to recover separated oil
- Gravity-flow discharge, with optional float-activated discharge pump for remote or automatic operation
- Standard sizes available: 500 gal, 750 gal, 1,500 gal (dimensions: 89” L × 53” W × 59” H; weight: ~500 lbs)
- 3-chamber unit with crossover channels to promote efficient flow, separation and clean discharge
Ideal use: Built for heavy-duty operations, the Evans Oil/Water Separator keeps wash water clean, compliant, and ready for downstream treatment.
- Oil & Gas
- Heavy Equipment & Construction
- Fleet Maintenance & Transportation
- Municipal/Public Works
- Manufacturing
- Industrial
Compatibility & Systems Integration
Use this Oil/Water Separator as the first stage in a full Evans wash water treatment program:
- Follow with the EMF/Mechanical Filtration System to handle smaller suspended solids and emulsified oils.
- Then apply the EBS/Bio System for organic contaminant breakdown, if required.
- Include closure or wash water recycling modules for closed-loop systems, discharge compliance, or water reuse.
This layered solution offers an advanced, high-performance wash water treatment, minimizes downtime, and supports regulatory compliance.
1. What contaminants does the Oil/Water Separator remove?
It is designed to remove floating oil, heavy particulates, and settled solids from wash water prior to further treatment.
2. Can it handle emulsified oils or dissolved hydrocarbons?
No. This unit is primarily for free oil and solids. For emulsified oils or dissolved organics, you’ll want the downstream filtration or biological wash water treatment systems (EMF/EBS).
3. What are the standard sizes and materials available?
Standard models are available at 500, 750 and 1,500 gallon capacities, constructed in marine-grade aluminum (89” L × 53” W × 59” H; ~500 lbs).
4. Does this system integrate with other Evans treatment systems?
Yes. The oil water separator is designed as a pretreatment step in industrial water recycling systems that pairs with the EMF filtration or EBS bioremediation systems for full wash water treatment.
5. What maintenance is required?
Routine maintenance includes oil skimmer decanting, solids removal from the hopper, visual inspection of chamber integrity, and ensuring proper flow. Scheduled maintenance plans from Evans can help support these efforts.
6. Does this help with regulatory compliance and discharge permits?
Yes. Removing the bulk of oil and solids upfront reduces the load on downstream systems and improves your chances of meeting discharge or reuse criteria under EPA and state permitting.