The place where my vetiver plants grow is virtually surrounded
by farms and farmers that, despite any legislation on
the disposal of nitrates, dispose of the wastewater simply discharging it in
holes in the ground, or better in ditches.
Given that here the irrigation water costs 150€ for 45 days
by the single hydrant (as a result of an effective
privatization action conducted in recent years
in a bipartisan fashion by any government and
by each regional authority), I have decided to proceed
as usual with "Own Means" to dispose of some pollution
that ends up at sea (very close to the land in question) and save
some money which, these days, for sure, will find better use elsewere.
The ditch bottom retains a good 50 cm of water
(for a flaw of execution) until at least July,
I therefore devised a two stages system, able to filter the suspended solids.
The first stage consists of a gravel filter contained within a
concrete pipe that sat abandoned for years in the nearby field;
a submerged pump draws the water through the gravel which, this way is kept free of algae and
mucilages present in industrial quantities,
thus denouncing the strong presence of nitrates and phosphates.
The second stage is built with a modified pump pressure aid with
two check valves, a couple of fittings, and filled with quartzite to operate
a more accurate sand filtration of water.
The chemical quality of water of course does not change,
the plants take advantage of the nourishment excess
and the excess of such irrigation is released in the watertable after
a vertical filtering operated by the plant itself.
A double goal is so achieved: intercept pollution and save money.
Not just a pretty face....