Platinum: Embodied Land

A car catalyst contains platinum, which is slowly used and lost during driving. It ends up as dust in the streets.  Which can be a source in itself for harvesting platinum, as was subject of research some years ago by Angela Murray in the UK.  She found that “If a road sweeper went along a city street 3km long for a year we could produce 30g of platinum.” “This would be enough to make into a ring that might sell for £2,500.”

Recalculated this would provide , with a street 3000 mtr long and an estimated 8 mtr wide,  imply 0,00125 gr/m2 each year or , in other words, it requires 800 m2-year/gram. Since the road is primarily to support traffic, its for discussion how to allocate the harvest area for Embodied Land. Nevertheless the energy and equipment invested would. ( not yet calculated, anybody?)

In fact this can count as a reference environment for platinum: a diluted and dispersed form, a high entropy environment in exergy/thermo-dynamical terms. And as such a measure for compensating depletion, or regeneration.

Interesting is that this has actually led to application: Veolia in UK, contracting city cleaning,  has build facilities for this. In fact for economical reasons of course; they have the dust already, so adding the filtering can give them an economical profit, see http://www.reuters.com/article/britain-environment-dust-idUSL6N0TM38A20141202

0,00125 gr/m2 each year is 12,5 gr /ha-year , available on road -land.