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TELLUS Report Summary

Project ID: 11991
Funded under: FP5-GROWTH
Country: Netherlands

Clean and silent public transport fleet

At the start of the project the bus fleet of Rotterdam consisted of 181 buses in EURO I standard and 4 buses with CRT filter in EURO II/III standard. This leads to emissions of hazardous substances such as small particles (dust, soot) and NOx. Although emissions of both small particles and NOx have decreased in recent years, the transport sector is the main polluter for these emissions. Currently (2001) the air quality levels in Rotterdam for these substances are only just compliant with national directives.

Converting of the whole bus-fleet to EURO IV/V standard using the DNOx filter technique would be a step to decrease emissions to air and improve urban air quality.
Furthermore the city of Rotterdam prepared policies to decrease the burden by road noise.

Currently (2003) some 3800 dwellings suffer from road noise up to level of 65 dB(A). The introduction of silent vehicles by using hybrid techniques could be first step to address this policy issue. At the start of the TELLUS project 1 prototype light weight hybrid bus with EURO IV standard was available for testing purposes but not yet in operation.

The measure aims to convert the whole bus-fleet to EURO IV/V standard using the DNOx filter technique; 138 existing buses will be converted with a complete DNOx system and 74 new buses will be improved with an additional DNOx system. Such a systems consists of three parts, an oxidizing catalyst, a particle filter and a low-pressure Exhaust Gas

Regeneration system.
The demonstration design was to retrofit 7 buses with DNOx filters. The 7 buses should been put into normal operation by the Rotterdam Public Transport Company (RET). The filter system supplier Erland Nilsson (EN) was responsible for the monitoring of the DNOx filter.

After this first operation, the filters should be evaluated and assessed in order to prepare a decision for the conversion of the remaining bus-fleet.

In the course of 2004 the design was changed into installing active SCR (Selective Cathalytic Reduction) filter systems supplied by ETG (Emissions Technology Group) in 7 new buses.

The lightweight hybrid bus should be tested for 3 years in this project. The evaluation and dissemination of this bus experience will have to result in further improvement for new developments in this field.

The innovative aspects are the introduction of DNOx filters (and especially SCR filters), lightweight hybrid bus concept and extremely silent and energy efficient rail vehicles.

Reported by

City of Rotterdam
P.O. Box 112
30020 AC Rotterdam
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