Oil Water Separator
What is Oil Water Separation Systems?
Oil Water Separators are specialised treatment systems that remove hydrocarbons, grease, and suspended solids from wash down water to ensure compliance with environmental regulations. They operate using physical separation technologies such as coalescing plate packs or vertical tube coalescers, which accelerate the natural separation of oil droplets and solids from water.
Under EPA guidelines and Australian Standard AS 1940 (The Storage and Handling of Flammable and Combustible Liquids), discharge water must contain less than 10 mg/L of total petroleum hydrocarbons (TPH) and be free from visible oil sheens before it can be legally discharged or reused.
Washbay HQ | Oil Water Separators are purpose-built to exceed these requirements, integrating into our 100% above ground modular wash bay systems. Unlike traditional in-ground systems that require extensive civil works, our modular design:
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Ensures rapid deployment without council approval delays.
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Provides full portability for temporary or leased sites.
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Delivers lower maintenance and lifecycle costs through easy access and robust Australian-made construction.
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Keeps clients compliant with EPA, WHS, and council standards across mining, transport, automotive, and government sectors.
Standards Every Oil Water Separator Should Meet
If a supplier can’t reference these by name, that’s your cue to slow down.
(OWS) — Product Overview
The WashBay HQ | Oil Water Separator (OWS- 1500 (L/h) / 3000 (L/h) / 6000 (L/h) ) are high performance wastewater treatment system engineered to reliably remove hydrocarbons and oil from wash down water. Designed for rigorous industrial usage, this asset supports regulatory compliance, operational efficiency and environmental protection across industries such as mining, transport, construction, equipment hire, defence and government.
How Oil Water Separators Work for Reliable Wastewater Treatment
Oil water separators play a critical role in treating contaminated wash water before discharge to sewer or reuse systems. In most industrial wash bays, wastewater contains free oil, grease, fuel residues, and suspended solids that must be removed to meet EPA and trade waste requirements. The effectiveness of any oil water separator depends on how well it separates these contaminants under real operating conditions.
WashBay HQ systems use vertical tube coalescing technology to increase contact surface area and improve oil droplet separation. As wastewater flows through the unit, small oil particles combine into larger droplets that naturally rise to the surface for collection. At the same time, heavier solids settle out, protecting the system and maintaining performance.
This process ensures consistent hydrocarbon removal across varying loads and site conditions. By treating wastewater at the source, businesses reduce environmental risk, protect infrastructure, and maintain compliance with Australian discharge standards.
Coalescing Technology Compared: VTC vs Plate Pack vs API
How Vertical Tube Coalescing Technology Eliminates Maintenance Problems
Traditional coalescing plate packs are prone to clogging under high-solids wash water conditions – a common failure point in fleet depot and mining environments. WashbayHQ’s Vertical Tube Coalescing (VTC) filter technology addresses this directly. As contaminated water flows downward through a dense arrangement of vertical polymer tubes, fine oil droplets collide, merge, and rise to the surface for collection, while heavier solids settle simultaneously.
The vertical orientation creates a self-cleaning flow path that resists blockage without operator intervention, extending service intervals and reducing downtime between maintenance cycles.
Typical TPH Discharge Limits Across Australian Authorities
Where your oil water separator has to land, depending on the receiving water authority. Lower number = stricter.
A correctly sized oil water separator lands you well inside every state’s threshold. Get the sizing wrong and you bounce in and out of compliance on busy wash days.
Applications
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Wash bays and vehicle/equipment cleaning operations where oil, grease, fuel or other hydrocarbons contaminate wastewater.
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Industries with heavy wash-down demands: mining, construction, logistics, defence, and government fleets.
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Situations requiring compliance with local EPA, council, or trade waste discharge standards.
Oil Water Separator Applications Across Key Industries
Oil water separators are used across a wide range of industries where wash down water contains hydrocarbons and contaminants. From mining and construction sites to transport depots and government fleets, any operation that cleans vehicles or equipment must manage oily wastewater effectively.
In high-demand environments, separators are commonly installed in wash bays, maintenance areas, and heavy equipment cleaning zones. They support compliance with local council trade waste permits by removing oil, grease, and solids before discharge. This is essential for avoiding fines, preventing environmental damage, and maintaining operational continuity.
WashBay HQ systems are designed for industrial conditions where reliability and simplicity are critical. Their above-ground, modular design allows for fast installation, easy access, and adaptability across different site layouts. Whether for permanent facilities or temporary projects, these systems provide a practical solution for managing wastewater while meeting regulatory requirements.
Oil Water Separator Sizing Guide: How to Select the Right System for Your Site
Choosing the correct oil water separator starts with understanding your wash bay’s peak hydraulic load, not just average daily flow. Separator sizing should consider wash-down duration, pump discharge rate, rainfall ingress for unroofed bays, sediment load, and the type of hydrocarbons present, such as diesel, hydraulic oil, and engine oil. Undersized systems increase non-compliance risk, while oversized systems create unnecessary capital expense.
Key sizing factors include maximum instantaneous flow rate in L/h, expected oil concentration and droplet size, wash bay traffic frequency, solids and grit volume, and trade waste discharge limits set by the local water authority.
For high-traffic fleet depots, transport yards, mining operations, and construction sites, designing around peak demand ensures consistent hydrocarbon separation performance during surge events. A properly sized above-ground system protects operational continuity, reduces environmental risk exposure, and supports smoother trade waste approvals without costly retrofits.
Quick-Pick: Which Flow Rate Suits Your Site?
If you’re between sizes, always go up. Undersized units are the single biggest cause of trade waste non-compliance on busy days.
Meet Australian Trade Waste Discharge Standards with a Certified Oil Water Separator
Discharging industrial wash water without the right pre-treatment exposes your business to council fines, EPA enforcement, and operational shutdowns. WashbayHQ OWS units are engineered to reduce total petroleum hydrocarbons (TPH) to below 30–50 ppm — the accepted threshold across most Australian state EPAs and local council trade waste permits.
Every unit ships with full compliance documentation to support your trade waste permit application from day one. Available in 1,500, 3,000, and 6,000 L/h flow rates, each system is sized to match your site’s peak hydraulic load rather than average daily flow — the critical factor for avoiding non-compliance during surge events.
Above-Ground vs In-Ground: What an Oil Water Separator Will and Won’t Do
Why Choose WashBay HQ’s Oil Water Separator
WashBay HQ’s OWS integrates seamlessly into above ground modular wash bay setups, offering a turnkey solution that protects your site’s operations from non-compliance risk, environmental damage, and costly fines. Because it’s built to handle real world demands, you get reliability, lower maintenance, and peace of mind.
Get an Oil Water Separator quote in 24 hours
Pick the right flow rate, get trade waste documentation included, and skip the council civil works. No pushy sales, no surprises.