Hauraton Drainage

Werkstraße 13
76437 Rastatt / Deutschland
+49 7222 958-0

Old tyres: Microplastic particles and microrubber from tyre abrasion pollute the environment  zoom

DRAINFIX®CLEAN - Channel system filters microplastic and microrubber from tyre abrasion.


Tyre tracks show tire wear from car tyres  zoom

1. What is tyre abrasion?

1.1 How does tyre abrasion occur?

When a car is driven, so-called tyre abrasion occurs. Increased tyre wear occurs during acceleration, braking and cornering. Tyre abrasion also results from driving on gravel roads or uphill driving. According to calculations, Germany produces 110,000 tons annually. Passenger cars are mainly responsible which cause more than 11 times as much microplastic as lorries.


1.2 Microplastics and pollutants in tyre abrasion

High microrubber emissions into the environment are caused by tyre abrasion. Microrubber is one of the largest groups of microplastic emissions on our roads. It is estimated that tyre abrasion is the cause of approximately 97% of the total microrubber released into the environment.

In addition to natural and synthetic rubber, car tyres also contain fillers and additives. These consist of: Vulcanising agents, antioxidants, plasticisers, mineral fillers and heavy metals. The abraded mixture of the tyres also occurs in combination with other pollutant components, such as in combination with particles of the respective road surface and other free particles from the surface. Tyre abrasion is between 5-350 µm in size and has a relatively high density (1.8g/cm²), so that it is deposited on the road and at the roadside as microplastic particles or fine dust.


1.3 Microplastics caused by road traffic are released into the environment


A glance at the top 10 microplastic sources  in Germany shows that road traffic with tyre abrasion is not only the biggest cause of microplastics in the environment, but also ranks third with abrasion of bitumen in asphalt and ninth with abrasion of road markings.

According to the Federal Environmental Agency, 110,000 tonnes of tyre pollution are produced annually on German roads alone. When it rains, the settled tyre abrasion is washed off the road into the drainage system next to the road. Before this happens, other pollutants bind themselves to the microplastic particles from the tyre abrasion. The smaller the particle size (<AFS63), the larger the surface area available for potential pollutant binding.

Traffic on the motorway: tyre wear, road markings and bitumen from asphalt contaminate the environment as microplastics  zoom

The pollutants are either discharged directly into the sewage system or onto adjacent green areas where they seep into the ground unfiltered. In addition, corrosive de-icing salts are used in winter, which leads to a significantly higher concentration of heavy metals in rainwater runoff.

Studies have shown that traffic-related fine dust and microplastics have an impact on animals and organisms living in neighbouring waters. Residues from tyre pollution have been detected in fish, crustaceans or mussels living there.

Only surface filtration (with a specially designed filter material) can reliably filter fragmented microplastic particles and associated pollutants from rainwater, ensuring that only clean water enters the groundwater.


2. How can tyre abrasion be prevented from being released into the environment?

2.1 DRAINFIX CLEAN: Effective and ecological rainwater treatment

The DRAINFIX CLEAN filter substrate channel is an intelligent drainage solution that collects, filters and cleans rainwater. The system consists of the CARBOTEC 60 filter substrate and, for example, heavy-duty FASERFIX SUPER channels. Other channel bases can also be used depending on the load and hydraulic requirements.

In order to effectively retain microplastic and microrubber due to tyre abrasion and other pollutants, the substrate was developed with a specially designed filter resistance. This special filter resistance ensures that the cleaning performance works even with uneven flow, large connection surfaces and heavy rain.

Advantages of the special filter substrate CARBOTEC 60:

  • High carbonate content (carbonate reserve for many decades)
  • Precipitation/binding of dissolved heavy metals
  • Reliable filter effect and permanent retention of ultra-fine particles such as microplastics


2.2 Functionality of precipitation water treatment with DRAINFIX CLEAN

The purification of the rainwater through the principle of surface filtration (filter speed less than or equal to 2m/h): the substrate layer retains microplastics, tyre abrasion and pollutants. Thanks to the system's surface proximity, this atmospheric exposure ensures good ventilation, alternating humidity conditions and a high activity of micro- and small organisms on the filter surface. This creates favorable conditions for the aerobic, biogenic restructuring of the so-called filter cake from the dry-running system. This maintains long-term permeability and allows easy and cost-effective maintenance.

According to the approval procedure, the first filter inspection is only necessary after 10 years. In case of maintenance, only the filter cake has to be removed thanks to the surface filtration. The easy to open grating provides easy access to the system.

Due to the high load class of the drainage solution, the system can also be driven over as part of the traffic area, which does not require additional space. On the contrary, due to its size, the DRAINFIX CLEAN filter substrate channel has a filter area ratio many times larger than conventional street drains or manhole systems.

Road runoff before and after treatment with CARBOTEC 60zoom
Road runoff before and after treatment with CARBOTEC 60

3. Field test shows effectiveness in practice


Field tests have the decisive advantage over laboratory tests that processes and developments can be measured and evaluated under real conditions, such as chemical-physical processes or year-round measurements under various weather conditions. For many years HAURATON has been operating the test facility in Derchinger Straße in Augsburg for the development and operational evaluation of DRAINFIX CLEAN.

  • Ongoing testing from 2009 until today
  • Discharge of precipitation runoff from heavily trafficked federal roads  
  • No street cleaning
  • Measurement of inflows and outflows
  • Determination of pollutant contents, efficiency and hydraulic power
  • Special feature: Measurement in winter with heavy use of de-icing salt

Not only the results of the measurements at the test facility but also the results of the DIBt approval test confirm the effectiveness of DRAINFIX CLEAN. This provides double assurance.


Further information or questions?


Werkstraße 13
76437 Rastatt / Deutschland
+49 7222 958-0


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