When it rains, fuel residues and other environmentally harmful petroleum substances are flushed with rainwater into surface waters (streams, rivers, lakes) and can pollute them. To prevent this, apply separators. Thanks to the separators, the hydrocarbons are there removed from the water and storedwhich helps to ensure that our activities are environmentally friendly.

Legal requirement

Rainwater treatment from oil-based substances is a legal requirement, as stated in the Regulation of the Minister of Maritime Economy and Inland Navigation of July 12, 2019 (Journal of Laws 2019, item 1311) on substances particularly harmful to the aquatic environment and conditions to be met when discharging sewage into waters or into the ground, and during the discharge of rainwater or snow to waters or water facilities: § 17. 1. Pursuant to the regulations, rainwater must be purified of oil-based substances if the concentration of these substances is higher than 15 mg/l.

Such substances and harmful suspensions flow from large paved surfaces, on roads, highways, parking lots, gas stations, car washes, bus depots, industrial hallsrailway areas - wherever there are even small oil leaks from internal combustion engines or diesel machines.

Two technologies to choose from

Navotech offers two technologies that have been used in oil separators. These are lamellar technology and coalescing technology. Both solutions guarantee high efficiency and can be installed both in and out of traffic zones green areas.

They are easy to install and use. They are usually connected to a sampling device. For complete protection water it should be supplemented with sedimentation tank. We also offer devices combined in one chamber, i.e. integrated with the settling tank.

when to choose lamellar separator?

These solutions make it possible to treat rainwater over larger catchment areas. They are recommended for use at the exits of municipal rainwater collectors, in large car parks, to protect surface water in industrial plants, logistics centers, airports. They are also suitable for draining rainwater from highways and heavily trafficked roads. They are designed so that they can treat water with flows greater than nominal, which is their greatest advantage.

The pre-treatment efficiency is 5mg/m3 for nominal flow and decreases with increasing flow, but water treatment still takes place. This is extremely important when handling large and very large surfaces from which rainwater flows. The use of lamella separators is then the only effective solution.

Their design allows for the separation and retention of both oil-derived substances and mineral suspended solids (sands, suspensions) contained in rainwater and snow runoff from any type of catchment area.

These devices are recommended for large catchments where more or less rainwater may flow at different times, i.e. where there are varying flow loads and varying oil and suspended solids loads.

when to choose coalescing separator?

These coalescing solutions provide rainwater treatment for nominal flow only. The parameters of the device should be selected so that the nominal capacity separator was greater than the maximum flow of rainwater entering the device.

These devices are recommended for smaller catchments where pollutants are present in low concentrations, so they are suitable for garages and car washes, gas stations, parking lots, smaller industrial plants, drainage of bridges and road viaducts.

Coalescing separator is a specialized device that is used for isolation and containment petroleum substancesas well as mineral suspensions such as sand, sewage and slime. These pollutants can be present in rainwater and meltwater that flow from various types of drainage basins.

The main structural element of the separator is a sealed body made of concrete. It can take form well with a diameter ranging from 1000 to 3000 mm, or may be a separate chamber inside retention tank. The body of the device is so massive that it does not require additional load.

Coalescing separators should be supplied through a gravitational inflow. In situations where it is required pumping sewage, it is recommended to install a pumping station behind the separator.

Integrated with the settler

Fat separator with a sedimentation tank is a device designed for sewage treatment from fats and oils that may occur in rainwater and meltwater from various types of catchments. These devices are commonly used in industries such as gastronomy, food industry, hotel industry, or in various types of industrial plants.

Design of a fat separator with a settling tank consists of two key elements: a settling tank and a separator. The settling tank is designed to purify wastewater from mineral suspensions, while separator it is used to separate fats and oils from water.

Fat separators with a sedimentation tank it works based on the principles of gravity, which means that heavier substances sink to the bottom, while lighter substances float to the surface. This effectively separates fats and oils from the water, allowing them to be safely removed.

Thanks to its design, this device is easy to use and maintain, and at the same time guarantees effective performance wastewater treatment.

What to consider when choosing a separator?

In conclusion, when choosing the right type of separator, special attention should be paid to:

  • the size of the area from which the rainwater drains, which affects the volume of rainwater runoff,
  • the amount of suspended solids contained in rainwater,
  • operation of the device during storm flow,
  • degree of protection of surface waters into which rainwater flows - whether it is a protected zone, what is the speed of the current and how long does it take for the river or stream to self-clean.

Navotech company is a leader in separation technology, offering a wide range of petroleum separators that are reliable, efficient and easy to use. Our products are installed throughout Poland, ensuring the highest quality of services for our customers.

Our MAK-PE devices are designed to purify rainwater discharged from roads, car parks, parking and maneuvering yards, as well as technological sewage from car washes, mechanical workshops, repair shops, gas stations, storage places for vehicle parts, etc. They retain mineral suspensions such as sand , mud, ashes and petroleum substances.

We also offer SL solutions, which are designed to separate petroleum substances (oils, greases, gasoline, etc.). Due to the high throughput of up to 10 [l/s], the SL product line is used in rainwater treatment systems from urban catchment systems, in rainwater networks of industrial plants or equipment bases, in road and car park drainage systems, etc.

We encourage you to contact our team of experts who will help you choose the best solution for your business. Our experience and technical knowledge guarantee that we will provide you with a product that will meet all your requirements and contribute to the protection of our environment.


Author: M.Sc. Eng. Adam Głogowski