The new system of garbage collection, the result of technology developed in Sweden
, uses a network of underground pipes and powerful exhaust fans to direct the waste solid collection of the vents located along the streets or in apartment buildings up to special storage facilities. The principle is quite similar to that of the old pneumatic tube used in offices to send documents from one floor to another before the advent of e-mail.
users simply put their own waste, opportunamente differenziati, nelle varie colonnine sistemate lungo le strade che finiscono in condotte a 2.5 metri sotto terra: a intervalli di tempo regolari si attiva il sistema di aspirazione che mette in pressione l’intera rete di tubi di 50 cm di diametro e risucchia l’immondizia verso il centro di stoccaggio a una velocità di circa 70 km all’ora. Qui i rifiuti vengono raccolti in container sigillati che saranno prelevati dai camion e trasportati agli impianti di smaltimento. La distanza massima tra le bocchette di immissione e la centrale di raccolta è di due chilometri: ciò significa che il sistema pneumatico può essere impiegato a livello di quartiere o di singola zona residenziale. Speciali filtri a carboni attivi provvedono a eliminare dust and odors from the air before returning to the environment. The analysis of the pneumatic garbage collection confirm that the system is effective, economical and environmentally friendly.
costs are lower by 15-20% compared to traditional management. The patented by
Envac maximizes the collection (though you can only paper, plastic and undifferentiated) and prevents the exit of the trucks for the collection and sorting of waste. In addition, the presence on the territory of very congested bins, toilets and do not need to be emptied.
Hammarby Siostad is the neighborhood Swedish environmental paradise. "Sjöstad, which literally means" water town "owes its name not only to be done on the lake that bathes the Swedish capital, but also because water is its main energy source. The most fascinating aspect Hammarby Sjöstad, in fact, is the incredible effort to minimize environmental impact and make the area self-sufficient in energy thanks to the use of clean, renewable sources. Biomass, biogas, solar, hydrogen power plant hydropower to provide over 8000 flats almost total coverage of energy needs. When work will be completed in 2012, Hammarby Sjöstad host 20 000 inhabitants and 10 000 other people will go there every day to work in the business, covering an area of \u200b\u200b200 thousand square meters. But the real peculiarity of this new district is represented by the recycling system set up to convert any waste produced by residents in clean energy, ready to use. All domestic sewage are transported in huge tanks underground where, through appropriate treatment, biogas slurry formed immediately re-used in the kitchens of the same buildings, while the solid residues are then harvested and processed into fertilizer. Half of the apartments are equipped with this Sjöstad Hammarby type of gas cookers. Even the waste, properly separated, are collected in huge underground tanks emptied by suction and sent for recycling (thus avoiding unsightly bins and minimizing the costs of collection). The non-recyclable waste are transported to the local incinerator. Their combustion produces heat sufficient to cover 47% of home heating. The remaining 50% comes from the combustion of organic olive oil (16%) and energy produced from sewage water (34%). The electricity comes from solar panels instead placed on the roofs of buildings, able to ensure the lighting of the common areas and half of the hot water needs for domestic use. Hammarby Sjöstad has a short closed-loop recycling system, in which the people "contribute" up to 50 percent of the energy needed by producing waste, mind the remaining 50 percent comes from other clean sources: solar panels, power and water wind.
