hanit Biofilter raised flooring system


High-quality exhaust air cleaning

Our biofilter raised flooring system made from hanit recycling plastic have been specially developed for use in bio-filter systems. As a ventilation and inflow floor, our system solution provides a long-lasting and cost-effective alternative to conventional models made from wood, steel or concrete, since these materials cannot withstand the long-term effects of the warm and moist micro-climate and the strong chemical loads in bio-filters. Damage caused by decomposition or corrosion is inevitable, meaning that efficient air circulation and environmentally friendly exhaust air cleaning can only be ensured if regular maintenance work is carried out. And sooner or later, the floor will also have to be replaced if conventional materials are used.

The chemical-resistant solution

Our biofilter raised flooring system hanit made from recycling plastic performs significantly better under extreme conditions in bio-filters because the robust material is resistant to chemicals, acids and micro-organisms. hanit also permanently withstands a prevailing temperature of 50 °C and humidity of almost 100%. The robust recycling plastic can also cope with high mechanical loads, meaning that our biofilter raised flooring system can be driven over with vehicles with a gross weight of up to 3 tonnes with appropriate installation. Our hanit biofilter raised flooring system, therefore, guarantees a high degree of circulation capability and reliable and maintenance-free use over a long period, and is already successfully being used in many areas such as in composting systems, sewage treatment plants and in the food and animal feed industry.

The hanit biofilter raised flooring system is comparatively quick and easy to install. The gratings are simply fitted to the top of the supports, and the light weight of the components also makes installation easier. If required, the biofilter raised flooring system can be flexibly adapted to the on-site situation without problems, since hanit can be processed using normal commercial tools in a similar way to wood. For example, the height of the supports can be adapted to the depth of the floor tray, and all conceivable filter dimensions and shapes can be realised – even round filters are easy to implement.


Material characteristics of hanit

High load bearing capacity
Resistant to acids, alkalis and oils
Continuous operating temperature of -20 to 50°C
Resistant to micro-organisms

High load bearing capacity

Resistant to acids, alkalis and oils



Continuous operating temperature of -20 to 50 °C

Resistant to micro-organisms


Individual solutions from hanit

Item No.: 6000522

Our hanit System products can be flexibly adapted to customer-specific requirements. Just talk to us – we’ll find the right solution together.


Melbourne Water | Sewage treatment plant east | Melbourne Australia

Melbourne Water is a state-run authority which monitors and manages the majority of the bodies of water and water supplies in Melbourne, Australia. These include reservoirs, lakes, wetland areas, rivers and the city's sewage and drainage systems. Sewage treatment plant East is located in the suburbs in the south-east of the city and uses innovative processes for converting wastewater into class A recycled water. Approximately 330 million litres of sewage is treated every day in the plant, which represents almost half of the city’s sewage. The bio-filter is the primary odour control system in the plant and treats 248,000 m3 per hour. The flow is divided among 5 bio-filters, each with 6 cells with a media bed depth of 13.5 x 9.5 x 1.2 m.

The bio-filter had to be replaced in 2017 because of extreme wear. As part of a tender, Bioaction, a specialised service provider for wastewater customers in the area of odour prevention and corrosion reduction, was granted the order for redevelopment. Shortly afterwards the company approached us to discuss the possibility of using hanit recycling plastic and involving HAHN Plastics in the project as a technically experienced partner. In addition to a significant amount of wear, other problems were also discovered during the initial assessment on-site. It quickly became clear that the original construction had several deficits, including a significantly elevated bio-filter floor. Another challenge was the fulfilment of the environmental regulations, which could only be achieved with optimum bio-filter performance. For this reason, Melbourne Water considered extending the system by constructing a new 6-cell bio-filter to increase its capacity.

During the planning phase, Bioaction carried out CFD modelling (Computational Fluid Dynamics) to simulate the use of hanit recycling plastic and the associated advantages thereof. The model showed that a floor structure with hanit would increase the effective surfaces of the media bed and would therefore lead to more even air distribution through the filter media. Following the successful implementation of the project, the hanit floor structure proved to have another significant advantage. The capacity of the bio-filter could be increased by 20 % by using separate support feet with different heights. This meant that the originally planned extension of the system was no longer needed, which saved customer Melbourne Water a considerable amount of money.

The project was completed in June 2017. Overall, the project was able to be implemented to the customer’s complete satisfaction, not only from a timing point of view, but also because of the quick and easy installation, and also financially thanks to the capacity increase.

hanit Biofilter raised flooring system
hanit Biofilter raised flooring system
hanit Biofilter raised flooring system


Standard dimensions - special dimensions on request

Width: 500 mm
Length: 1,000 mm
Height: 80 mm
Weight: 15.7 kg

Diameter: 150 mm
Length: 300 - 1,000 mm
Weight: 2.7 - 9.5 kg


Get in touch

As an experienced project partner, we know that every project has its own complexity.
Our hanit System experts would be pleased to take the time to analyse your requirements with you and find the best possible solution for your project.
Just talk to us – we look forward to getting to know you.

Georgina Bourdon

Georgina Bourdon

+44 161 8501965
+44 7961630 886

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