Mercer International Overview
Mercer International original designers had decades of experience as manufacturers reps in the oily wastewater treatment arena. They also understood the importance of supplying the real needs of their clients.
As Mercer developed its line of high-performance Oil/Water Separators, the founders polled various end users extensively about what they liked, disliked, and what they really needed from their oil/water separators. The resulting innovative design is now a bench mark in the OWS industry.
Mercer’s new separator line incorporated many time-honored separator features (e.g. flat parallel coalescer plates) with some very unique innovations, making their design both high efficiency and low maintenance. A design that truly achieves both high-efficiency and low-maintenance is a very difficult proposition when solids are present in the wastewater. Mercer’s design is elegant: may we introduce to you our innovative Multi-Pack™ coalescer. When both high efficiency and low maintenance are achieved in one package, we call this a“high-performance” separator.
High Performance
Mercer International is widely recognized as being the highest performance coalescer separator available on the market. However, high efficiency is only one part of that equation. High performance is maintaining high efficiency for long stretches between required maintenance.
Most separators designed for high efficiency require very high maintenance. Many manufactures add secondary mesh packs to help make up for a poorly designed coalescer—resulting in extremely high maintenance requirements. Conversely, separators designed for low maintenance greatly sacrifice efficiency, leaving the end user with compromised results. This is what we call the “tension” in coalescer design. Mercer International has mastered the primary coalescer design, allowing both high efficiency and low maintenance—plus the ability to customize in the field. This can be translated: We Have Built a Better Mousetrap! This is critical to end users that are committed to “zero tolerance” in regard to exceeding their effluent limitations.
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Compliance
The Compliance Master oil/water separator is Mercer International’s flagship product line and is our most recognized development in the field of wastewater treatment. With the Clean Water Act of the 1970’s in the U.S. came a new set of rules. The creation of oversight bodies and new benchmarks for acceptable wastewater effluent limits were long overdue. With these new regulations came an enforcement body that drew its cross hairs around not only the biggest discharge offenders, but those with the biggest purse strings as well.
Mercer International was founded as a company to remove the gray area for its clients. “Will it work?” was no longer a question that was accepted without significant review. It was about time a separator manufacturer brought the actual performance in parody with theoretical calculations. When the traditional tank manufactures failed to address the key design changes that needed to be made, Mercer designed and manufactured separator equipment to meet the new regulations instead of designing around the status quo.
The result was ‘piece of mind’ for not only major utility, petro-chemical, and industrial companies and large transportation companies; but also piece of mind for the small automotive shops, and various small to medium industrial companies. Environmental consulting engineers often specify our oil/water separators because of its versatile design. Mercer builds standard units of all sizes (5-5,000 gpm) and of various configurations and styles. We sell to a wide array of clients in many industries.
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Flexibility
“We can do that” is what we like to say. Or you may hear us say “No we don’t think you need that. Have you considered this?” Or, “this is what we did for another client. . .”
During the project review, flexibility means customization. Mercer has created many custom oil/water separators based on difficult wastewater applications, tight space limitations, and varied corrosive wastewater conditions and high temperatures, to name a few. Demanding applications demand custom solutions.
Mercer carefully listens to (and occasionally even challenges) the decision makers in the selection process from CEO, to engineer, to maintenance professional. Constantly seeking out and solving these technical problems has led Mercer to identify and incorporate certain design standards that are overlooked by the competition.
The Multi-Pack design allows flexibility that is impossible to obtain with other coalescer designs. For example, the plate gaps within the coalescer can be varied in order to fine-tune the separator to maximize efficiency. After the installation process, flexibility means the ability to handle unforeseen wastewater conditions, changes in effluent limitations, or a change in the amount of solids present in the wastewater.
The Multi -Pack Removable Plate Coalescer System allows the end user to adjust to any 5/16″ right angle gap, in the field, by simply adding or removing the smooth, flat coalescer plates. If a higher efficiency is required down the road, just add additional plates and maximize the efficiency of the coalscer by increasing plate surface area–without any modifications to the separator or the coalescer! Have an issue with solids fouling certain areas of the coalescer? Simply pull plates only in these areas and keep the higher efficiency throughout the rest of the pack. The Multi-Pack can be fine-tuned in the field to meet your effluent efficiency needs as well as the maintenance requirements.
Another interesting way to utilize the adjustable plate feature is to keep tighter plate gaps toward to top of the coalescer pack, where there are typically fewer solids present, and larger plate gaps toward the bottom where solids concentrations are frequently higher.
Mercer International Products
Above Ground Oil Water Separators

Compliance Master™ s the Multi-Pack
Below Ground Oil Water Separators

Mercer supplies a line of high-performance, cylindrical below-ground oil/water separators from 50-5,000 gpm (10-1,000 m3/h). Separators are available in carbon steel (single and double wall) with a variety of coatings, including FRP and sti-P3™† coatings. Mercer also offers a line of competitive below ground plastic units that are an ideal solution for fleet installations, small washbay needs, and anywhere competitive pricing is a concern.
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Custom Oil Water Separators

The process begins by listening to the client. Even the smallest components or accessories sometimes need to be adjusted based on the requirements of the project. However, beyond the small details, Mercer has dedicated itself to solving difficult design and fabrication issues. These special situations often have Mercer exploring solutions that include the changing of existing process designs, various choices of materials of construction, creating turnkey systems, and solving field issues such as designing field-assembled units for areas that are difficult to access.
Existing System Retrofits

Mercer International has a knack for providing cost-efficient solutions for existing “under performing” separators or other separator units that fail prematurely due to fouling from solids. If the client’s separator tank is in good condition, Mercer will custom design a solution to replace the internal coalescers and components with high-performance coalescers.
Mercer excels at replacing poorly-designed coalescers of various brands of existing oil water separators, with custom-fit Multi-Pack coalescers and baffles to improve the design, offering higher efficiencies with less maintenance requirements. This may be a cost-effective alternative to purchasing a brand new unit.
Existing concrete API units can be easily outfitted with the Multi-Pack coalescer and accessories, as well. Mercer’s field-adjustable coalescers, components and accessories help make an antiquated API separator ready to operate efficiently well into the 21st century.
Rental Oil Water Separators

Oil Skimmers

Mercer International incorporates state-of-the-art automatic oil skimmers to continually remove the excess oil that accumulates at the top of the separator, allowing each unit to function to its fullest potential.
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