Local Communities and STT Train Turns:  a reciprocal engagement for the durable development the engagement of the local communities in the durable development meets fully that of STT Train Turns SA.

On a side, the local communities seek for their territory a controlled, concerted and responsible development, protecting better the ecosystems and medical safety from the populations.

They for this purpose were initiated in steps of durable development of the type Agenda 21.  Other side, STT TRAIN TURNS SA strongly mobilized in favour of the durable development through various initiatives the use of energy renewable as well as the setting-up of technique of last technology.

Biocarburan renewable Source of energy, it acts of a fuel of vegetable origin (in particular colza).  There are two types of biocarburants:  the vegetable oil biothanol and ester.  Filter Dispositif particle known as of "post treatment" installed instead of silencer.

Crossed by exhaust fumes, it makes it possible to treat them to lower harmfulness of it according to two mechanisms:  the catalytic effect makes it possible to transform certain gases into other less polluting components and the filter makes it possible to trap the particles before burning them to avoid clogging.

The fundamental parameter controlling the operation of a filter is the temperature of exhaust fumes which must be sufficient to allow the spontaneous oxidation of the particles (500°C approximately).

For the buses, circulating generally at low speed and functioning a long time with the idle, the temperature of gases in a silencer and/or a catalyst hardly 250°C exceeds:  the problems are thus to make correspond these two values either by a fall in the temperature of autocombustion, or by an increase in the temperature of gases.