Page 12 - Case study: Fine dust filtration in Stuttgart, Germany

MANN+HUMMEL approached the state of Baden-Württemberg and presented its newly developed
technology, the Filter Cubes, for the filtration of fine dust at the end of 2017. As a result, an
independent engineering office carried out a simulation for the road section at the Neckartor, which
included the performance of the filtration systems, traffic conditions, and environmental conditions.
The Cubes promised a reduction in fine dust pollution on site. The state transport ministry then
initiated the pilot project with MANN+HUMMEL and the city of Stuttgart in order to implement
these Cubes.

The city of Stuttgart is a central partner for MANN+HUMMEL. The Municipal Civil Engineering office
(part of the city of Stuttgart) was responsible for the planning and preparation of the infrastructure
as well as the installation of the systems, which included:

• Consultation regarding the necessity of a building permit

• Coordination and definition of the locations of the systems

• Provision of the electrical cabling and supply

• Design and construction

• Road closure

The Municipal Office for Environmental Protection (part of the city of Stuttgart) and
MANN+HUMMEL coordinated activities for the proof of concept. This includes:

• planning and implementation of the measurement campaigns

• selection and provision of measuring equipment

The costs of the project are shared by all three project partners. The project itself is scheduled to
run for two years until the end of 2020. The first evaluation results have proven the effectiveness of
the filtration technologies, and a final evaluation of the project will take place after the end of the
two years.

Following the installation of the filter columns at the Neckartor in Stuttgart, MANN+HUMMEL has
proved that the filter cubes can reduce both particulate matter and NO2 concentrations at polluted
locations. The laboratory results from MANN+HUMMEL and the simulations carried out by an
independent engineering office have proven that the effectiveness of the fine dust filters can be
transferred to NO2 technology. It was agreed between the project partners that the filter systems
already installed would be converted to this technology by summer 2019.

6 Fine dust filtration - Stuttgart, Germany