Separating oil and water is not only the right thing to do but, in many places, it’s the law: Lots of countries have put in place stringent regulations – including costly penalties – to ensure that oil and water are kept separate to keep the oil from entering the water cycle. As is often the case, however, these rules are not uniform, meaning that some jurisdictions consider a certain trace amount of oil in water safe, while others will treat it as a violation of environmental standards.
In addition, it is more likely that these regulations will be tightened than relaxed, so businesses merely doing the bare minimum now will have to spend more later.
Therefore, it makes sense to invest in proper oil-water separators now, such as Atlas Copco’s OSS. They offer an affordable absorption-based condensate management for smaller oil-injected piston or rotary screw compressors (below 30 l/s or 60 cfm).
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Here is how an oil-water separator works: The condensate enters the OSS via an inlet connection and is fed into the separator. In a pre-filtration step, the condensate, which still contains oil and water, seeps through polypropylene-based filter media, which absorb and capture only the oil. Then, in the post-filtration stage, advanced new filter media absorb the remaining oil.
The result: Clean condensate exits from the outlet with almost no residual oil content and can be safely discarded into the sewage drain. The process is so effective that it removes oil traces to concentrations below 15 ppm.
That is usually well below the level for safe sewage disposal that is defined in various international and local guidelines and standards, which means that you will likely be able to continue using the OSS even if environmental rules are tightened further.
However, the OSS does much more than reliably separating oil from water and then safely disposing of it.
Most importantly, oil-water separators with this technology are an economic solution that saves money by avoiding a costly third-party condensate collection. The OSS, which consists of materials that are 100% recyclable, is easy to install, use and replace. Finally, its compact and lightweight design are optimized for small compressors.
All of these benefits make the OSS not only the right choice for the environment but also for your pocket book.
CPI oil separators are used in the treatment of wastewater to separate free oil, grease and hydrocarbons from the water phase.
Used in a variety of industries, oil separators assist in projects from very small separators for workshops and service stations to large separators for oil refineries; from mine sites to airports and for pre-treatment for desalination plants.
Coalescing Plate Interceptor (CPI) oil separators are a type of oil separator most commonly used to separate free oil from produced or effluent water or suspended solids for oily water treatment.
SWA’s industrial oil separator is the best in the world, with the proven ability to reduce oil concentration from 10,000ppm to less than 1ppm. If you would like to read more about our capability, please contact SWA for details of a case study.
What are CPIs?
CPIs are sometimes referred to as gravity separators, as they use gravity to remove suspended solids, free oils and grease from wastewater.
In this process, wastewater enters the CPI tank (by gravity or pumped flow) that contains a series of interceptor plates, which are either cross flow interceptors (CFI) or tilted plate interceptors (TPI). CFIs use flat plates tilted at 45 degrees across the direction of flow, whereas TPIs use a stack of corrugated plates tilted at 45 degrees in a downward flow angle.
The oil particles rise until they reach the underside surface of these plates, where they come together and coalesce to form larger oil droplets that then float to the surface of the water and are easily skimmed off.
Advantages of CPI Oil Separators
There are several key advantages to using CPI oil-water separators.
Firstly, with no moving parts within the oil separator, CPI oil-water separators are easy to maintain and run at a very low operating cost.
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There is little need for extensive or costly maintenance and there is a negligible requirement for spare parts.
Generally made from stainless steel or other suitable materials, this type of separator is also extremely reliable, with high efficiency and capacity, and improved process performance.
There are also no electrical parts, so no need for a power supply.
Once commissioned, these separators operate 24 hours per day, every single day — never stopping — and an annual service takes just two to three hours.
Additionally, these oil separators can be custom designed to meet plant performance or environmental needs.
Our CPI Style Oil Water Separators
SWA Water Australia manufactures industrial oil separators and has a range of CPI style oil separators available as Cross-Flow Interceptor (CFI) and Tilted Plate Interceptor (TPI) parallel plate gravity separators.
With both a commercial range (1m3/h to 5m3/h) and an industrial range (10m3/h to 500m3/h) available, SWA’s coalescing plate oil separators are modular in design and in concept.
Customers are able to nominate several operating conditions, including flow rate, influent oil concentration, the specific gravity of oil, and operating temperature. Available in a variety of materials, SWA’s range of CPI oil separators also has a range of customisable options, such as:
- Integral waste oil tank
- HLA in waste oil tank
- Pre-chambers for removal of grit and heavy solids
- Removable lids
- Gas blanketing
- Heavy oil separation
- Hazardous zoned area requirements
- Large and very large flow rate installations
- Combination with chemical demulsification and Dissolved Air Flotation (DAF)
- Duplex and super duplex materials available for high chloride containing waters.
20-year guarantee
At SWA Water Australia, we stand by the integrity of our design and the quality of our work by offering a twenty-year guarantee on our SWA CC range of CPI oil separators. Conditions do apply, so please get in touch.
We manufacture our proprietary equipment to stringent standards, using high-grade material, such as stainless steel, to ensure longevity and reliability. Our designs can be customised to fit the specifics of your plant and meet the specific standards and compliance requirements of your industry.
Are you looking for a wastewater treatment solution?
Contact the global leaders in industrial wastewater treatment today.
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