Thanks to Innosuisse, the Swiss agency for innovation
boost, we got the Innocheque funding to scale up our ingenious concept underground
green farming. In this frame, we will examine the possibility of growing crops,
such as lettuce, in an economical and sustainable way in underground caverns.
The project will use an underground cavern in the Hagerbach
Test Gallery, Flums (SG), that
has been already used by the Swiss Center of Applied Underground Technologies
(SCAUT), as a model facility for farming purposes. The project can count on the
long-standing expertise of Forster Salatgarten AG in hydroponic lettuce
cultivation and the experience of the Zurich University of Applied Sciences
(ZHAW) in the fields of vertical farming and climate control.
The underground green farming concept is a prime
example of new ways to use urban underground space. It can enhance current uses
by linking these to the new concept. Food is vital to the survival of our
cities, which is why growing underground is of paramount importance. The
building of caverns can be financed through the sale of the spill produced
which is often a valuable resource for the construction industry. Space can
also be found through repurposing existing underground spaces that have lost
their intended use, such as former civil defense shelters, abandoned metro
stations and underground car parks. By integrating the urban uses a circular
system can be created aiming at zero carbon, zero waste and zero land-use
(meets criteria for green infrastructure).
Our innovative
project ensures sustainable food production systems by using the concept of hydroponics.
Further, its underground production location makes it safe against impacts of
climate change, extreme weather, earthquakes, flooding and other geohazards,
maintaining thus a suitable ecosystem (meets criteria for climate adaption
measures). Being below the surface and isolated from its surroundings also
means no impact on the natural ecosystem as no pesticides are used (meets
criteria for risk resilience measures). In this way it is a good example of
urban resilience by sheltering two of the most important social needs from
surface forces.
This project is based
on preliminary projects lead by SCAUT. Together with industry partners, SCAUT
has developed and commissioned the first 'Underground Green Farming' prototype
for a sustainable food production by using aquaponics. Aquaponic systems
combine aquaculture with hydroponics in a symbiotic environment. The system
works in a cycle: water from the fishponds is fed to a hydroponic system and
then recirculated back to the aquaculture system. The second phase of the same
project has focused on the production of lettuce underground and demonstrated
that it is a possible concept.
The aim of this
current project is to find out to what extent continuous year-round lettuce
production is possible and what the production costs are. We are intended to
show whether and to what extent underground lettuce cultivation is worthwhile
in Switzerland. This preliminary study will further enable to test unique
selling points in terms of safe, high-yield and high-quality crop cultivation
and whether underground production of lettuce is at all marketable. If the
assessment of the position and potential in the market is deemed viable, the
productions system can be tested on a larger scale.