oil water separators

January 25, 2021
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Even though the terms “Oil Interceptors” and “Oil Water Separators” are often used
interchangeably, they are very different systems.

Interceptors

Oil interceptors
Oil interceptors are designed for use in drain lines where oils, sediment and other liquids are intercepted.

Oil interceptors are typically used in low flow drain lines where small quantities of oils, sediment
and other liquid contaminants can be “intercepted”. These drain lines may come from variety of
facilities including covered parking garages, machine shops, service stations, and manufacturing
facilities.

Usually constructed of steel, fiberglass or plastic, interceptors are simple systems which include a
baffle plate, a solids bucket, and a separation area. As the water enters the interceptor, a baffle
plate reduces the flow and turbulence of the incoming water which helps to drop out some solids
and sludge.

A low flow rate and little turbulence permits the oils and other light density to slowly separate from
the water and rise to the top of the separation area. From there, relatively oil-free water is
discharged to the sewer.

Oil Water Separators

In comparison, Oil Water Separators have a far more sophisticated and efficient design. They are used in higher volume applications such as industrial wash operations, parking lots, re-fueling facilities and military installations where there is a potential for a much higher volume of water, oil, and contaminants.

The standard oil water separator is a steel or stainless steel tank containing an inlet compartment, baffles system, sludge chamber, separation chamber with coalescing media, and clean water outlet chamber.

The water enters the inlet compartment where the oil separation process begins. Here, baffles slow down the water flow which causes some of the solids to drop out of suspension. Next, parallel corrugated coalescing media in the separation chamber cause the oil droplets in the water to coalesce together, and increase in size until they separate from the water. This coalescing media, with an internal structure of interconnecting channels, can remove essentially all free and dispersed, non-emulsified oils to an effluent concentration of less than 5 ppm – which is acceptable for discharge to most municipal sewer systems.


October 28, 2020
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During the winter as winter storms approach, many municipalities will spread salt directly on the roads.  Additionally, many have started to proactively apply what are called anti-icing fluids to prevent water from forming frost on the pavement surface. Whether anti-ice or deicing fluids, they all share the same basic chemistry, which is some form of salt.  The formulations include sodium chloride, calcium chloride or magnesium chloride. Additionally, the anti-icing fluids often include organics such as beet juice or cheese whey.

This presents a unique issue for winter washing operations, especially when closed loop wash water treatment systems are employed.  Closed loop wash water treatment systems are used in a variety of instances including no access to public sewer systems, unreasonable permitting issues associated with sending water to the sewer, and uneconomic costs to tie into a sewer system due to the distances.

When cars and trucks are driving on roads coated with either deicing or anti-icing fluids, the vehicle’s body will often become covered with a thin coating of salts.  During typical washing operations, the salt is flushed off.  If the wash bay is connected directly to a sewer, that salty water is diluted and simply sent to the city without issues.  However, if the wash system is connected to a closed loop system where that water is used over and over, the salt levels will continue to rise in the wash waters. This leads to the salt being reapplied to the vehicle, which show up as salt streaks when it is dried. But more important than the streaks, the salt residue enhances the corrosion process on the metal.

There is no simple or inexpensive way to remove salts from wash waters. One option is to haul off or send a portion of the salt contaminated water to a city sewer.  Another option is to use a thermal evaporator to continually evaporate a small amount of the water in the closed loop system’s volume so that fresh water can be added.  Periodically, the concentrated water and salt mixture in the evaporator would also have to be hauled off.  The evaporation process will reduce the total volume of waters to be hauled off, and hence, reduce the hauling cost. The third option is to use a membrane filtration system.  However, this method is expensive and not at all well suited to process waters contaminated with dirt, dust, cleaning chemistries, and oils.

The salt in the waters also has implications for the components of wash water treatment systems. Although our oil water separator system is constructed of 304 stainless steel, salts in the water may attack the welds in the unit and accelerate the corrosion process.  Additionally, salts will attack pump shafts and cause the seals to leak.  If this happens, the only solution is to change the pump.

To combat the effects of corrosion, we offer various levels of corrosion protection to our clients. For our oil water separators, we offer an internal coating which forms a tough barrier that protects the stainless steel from the salt.  For our other treatment systems, we can upgrade the pumps from carbon steel to a salt resistant 316 stainless steel, which will prevent any pitting of the shafts and pump internals.  We can also add a conductivity meter to continually monitor the amount of salts and other chemicals in the water and trigger an alarm when the levels rise too high.  Once this water is pumped out or discharged, fresh water is automatically added to the system, diluting the salts to a manageable level.


January 9, 2019
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Business at collision repair centers and auto body shops is booming these days! Once the cars are repaired, most shops like to enhance their customer service by washing the cars before giving them
back to the customer.

Wash pad for auto body shop

Today, however, you can’t just wash the cars in the back lot and let the water flow off site due to environmental regulations. That’s why we developed a simple turn-key wash bay package including a stainless steel oil water separator and a portable wash pad that can be installed and up and running in a day!

Wash Pad Features:

• Designed to be surface-mounted – No excavation required
• Built to any size and configuration
• Fiberglass composite system -1/4” steel plate core completely encapsulated in fiberglass
• Superior chemical resistance
• Shipped in multiple panels and easily installed
• Projected useful life of 15-20 years
• Simply re-located and re-used

oil water separator for auto body shop

Our separators and wash pads come in a range of different sizes so we can design a package to match your washing operations, space restrictions and environmental requirements.

OIL WATER SEPARATOR FEATURES:

  • Stainless steel construction 99%
  • Removal of all free oil and settlable solids
  • Pump & control system
  • Low installation and maintenance costs
  • Solids storage capability

AVAILABLE OPTIONS:

  • Pumping Systems
  • Portable Equipment Rooms
  • Splash Walls
  • Canopy Covers
  • Rain Diverter Systems
  • Below ground separators

Give us a call for more product information – 800-453-8639


July 10, 2017
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Back in the day… oil water separators were basically concrete vaults or steel tanks that were sized based on their total holding capacity. This holding capacity was related to the retention time needed to separate the oil from the water. Most cities and counties would size the oil water separators based solely on the square footage of area draining into the separator. This method, which rightfully erred on the side of caution, often tended to require facility owners to purchase extremely large separators.

Today… our oil water separators are engineered with multiple compartments and equipped with extremely efficient coalescing media to separate the oil from the water mixture in a much smaller system! Our media is capable of removing essentially all free and dispersed non-emulsified oils to an effluent concentration of less than 5 ppm. We now size our separators based mostly on oil viscosity and flow rate so they can be much smaller than they were in the past.

If needed, we can provide information and analysis to the regulatory agencies, which indicates that, at the calculated overflow rate, the separator will be properly sized and provided with the required square feet of projected plate separation area to achieve the specified performance under laminar flow conditions. Calculations shall take into account the rate of flow, potential surge flow, influent concentrations, particle characteristics, fluid temperature, fluid specific gravities, and PH.

Above Ground Oil Water Separators

We offer a complete line of high efficiency, stainless steel above ground oil water separators that will remove nearly all free and dispersed non-emulsified oil and settleable solids from the waste stream.

Read More About Oil Water Separators

Sewer Pre-Treatment (SPT) System Oil Water Separator Clarifier System for High Solids Applications

Oil Water Separator Clarifier System

The SPT Series Integrated Pretreatment Systems integrate an oil water separator with a clarifier to remove both floating oils and settleable solids.

Read More About SPT Series Sewer Pretreatment Systems

Below Ground Oil Water Separator

Below Ground Oil Water Separator Design
Featuring one of our oil water separator designs to be placed under ground.
Our single wall or double wall below ground parallel corrugated plate oil/water…

Read More About Below Ground Oil Water Separators

List of Different Kinds of Oil Water Separators:


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At WashBaySolutions.com, we have been specializing in high tech, custom-engineered solutions to complex washing and wastewater issues since 1991.
+ 1 800-453-8639

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sales@washbaysolutions.com

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