E-Newsletter

Low Emissions

DUST CONTROL IN DULEVO SWEEPERS

The dust raised by the central brush during the mechanical collection phase is spirated and retained in the container thanks to the vacuum generated in the container itself by the two suction fans.The capacity and head of these fans are sized so as to be sufficiently powerful to raise the dust, but not powerful enough to clog the filters; the result is a system with the capability to aspirate all the fine and ultrafine particles while, at the same time, guaranteeing the total elimination also of the lighter types of waste such as leaves, paper and plastic bags.
The special fabric filtering system also retains the finest dust and completes the sweeping cycle, ensuring that only clean air is re-emitted to the environment.
Dulevo's medium-sized sweepers are also designed according to the mechanical-suction-filtering principle with direct frontal collection.

The first step for our company was to examine the procedures available in a European context for the definition of the PM10 emitted by a sweeper. This research obviously produced negative results and encouraged our researchers to seek the valuable advice of organisations and bodies that could share the experience gained in other sectors. For this reason technicians and researchers were called to study and develop the specificities linked to the technical characteristics and methods of use of a sweeper and, consequently, to draw up an analysis procedure ad hoc.
The results of our tests describe in a simple but precise manner a variety of factors of unquestionable interest:

  • a)

    first of all, the real air flow rate of the machine tested in working conditions was measured (line A);

  • b)

    secondly, the weight in μg of the PM10 fraction present in one cubic metre of air emitted from each sweeper was measured in working conditions (line B);

  • c)

    then the PM10 data obtained (line B) were multiplied by the real air flow rate value of each single machine (line A), thus determining the weight of the PM10 fractions in grams emitted by each sweeper during one hour of operation (line C);

  • d)

    at this point, it was deemed necessary for the purpose of quantifying the "gaseous emissions" of the vehicles under examination over the course of one year of operation, to multiply the weight of the PM10 emitted in an one hour of operation (line C) by the number of hours worked in one year, i.e. 2000, thus obtaining the weight in kg of the PM10 fraction particles emitted to the atmosphere by each sweeper (line D).

It is also important to remember that the tests on the Dulevo machines were all carried out without the use of water.

The surmisable result illustrated by the table summarising our analysis reveals an extremely comforting situation, as the gaseous emissions produced by the sweeper equipped with the PM10 filtration technology patented by Dulevo and developed in cooperation with the Gore® Group, are well below the threshold imposed by the Euro 4 standard.

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