In contrast to bacterial degradation, nutrient
assimilation by plants is limited by surface, as
photosynthesis is dependent on solar radiation.
Therefore, to achieve maximum nutrient recycling
rates, trickling filter systems should provide
a large surface area for plant growth and
photosynthesis in relation to their volume. In
theory, a planted trickling filter could double
its nutrient recycling capacity when constructed
halve as deep and with a surface twice as large.
Given this, possible applications of the concept
would not be in the classic wastewater treatment
disciplines where land use is regarded as loss of
efficiency, but rather in industry sectors already
using large surfaces for plant production. In
other words, the idea is not to replace existing
filter techniques in municipal wastewater treatment
but to recruit producers of hydroponic vegetables
as recipients and users of nutrient-rich
wastewaters. This approach reflects postulations
that suggested to re-integrate agronomic production
forms nowadays separated in monocultures
to combined production systems [6].
In contrast to bacterial degradation, nutrient
assimilation by plants is limited by surface, as
photosynthesis is dependent on solar radiation.
Therefore, to achieve maximum nutrient recycling
rates, trickling filter systems should provide
a large surface area for plant growth and
photosynthesis in relation to their volume. In
theory, a planted trickling filter could double
its nutrient recycling capacity when constructed
halve as deep and with a surface twice as large.
Given this, possible applications of the concept
would not be in the classic wastewater treatment
disciplines where land use is regarded as loss of
efficiency, but rather in industry sectors already
using large surfaces for plant production. In
other words, the idea is not to replace existing
filter techniques in municipal wastewater treatment
but to recruit producers of hydroponic vegetables
as recipients and users of nutrient-rich
wastewaters. This approach reflects postulations
that suggested to re-integrate agronomic production
forms nowadays separated in monocultures
to combined production systems [6].
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