Millions from Waste — John Stuart Mill — John Shaqi
Millions from Waste
John Stuart Mill · en
The elimination of the dust and coarser material from the crude garbage
in the receiving screen leaves an appreciable quantity of organic
and inorganic matter, comprising such divers substances as paper,
fragments of wood, bottles, jars, bones, tins, and vegetable material
to be handled. As these cannot pass through the perforations in the
sifting screen they are delivered on to a broad endless conveyor-belt
travelling between two platforms. This is the “picking belt,” from the
fact that as the material is borne along between the two platforms
the useful material is removed by the hands of pickers, to be cast
into suitably disposed bins. In this manner the process of segregation
is carried out with the minimum of effort, while the material is in
movement, and under the most congenial conditions the character of the
work will permit. It represents the only stage at which recourse to
manual labour is required, so that it will be seen that hand-selection
is reduced to the absolute minimum.
The waste-paper is not touched by hand. At a suitable point a specially
designed hood, connected to an exhauster, is mounted over the picking
belt. When this is set in motion the induced draught is sufficiently
powerful to suck up the paper, and to bear it through a special conduit
to be discharged into a convenient receptacle, whence it may be removed
to the baling press.
This plant, known as the Hoyle refuse-recovery installation, after
its inventor and designer, Mr. H. P. Hoyle, is extremely efficient.
Simplicity is the outstanding feature, while its operation is
economical and requires only the minimum of labour. So far as power
is concerned a single 10 horse-power electric motor suffices for all
operations. The capital cost has also been kept down, the price of
the complete plant being from £1,500 to £2,000--$7,500 to $10,000.
At this figure the installation of the system should prove distinctly
profitable, more especially in conjunction with one or two auxiliary
appliances which offer the means to enhance the market value of the
recovered materials, although they are not essential. For instance,
an appreciable proportion of the tins thrown into the dust-bin are in
a bright condition and free from rust. Such tins can be made to yield
so much crude tin plate for the production of further tins, instead of
being subjected to the less economic process of crushing, baling, and
detinning or transference to the furnaces in billet form to be melted
down.