Tässä tuodaan yleisesti esille jäteveden ravinteiden kierrätyksen tärkeys ...
Human wastewater valuable to global agriculture, economics... vaikka sitten onkin päädytty tulokseen, että saavutettavat hyödyt eivät ole kaikkialla yhtä suuret. Kuitenkin, jossain ne voivat olla näin dramaattisia:
The study shows that a variety of cities throughout the world could benefit from this proposed sustainability approach -- not only for helping grow crops, but also for their economic independence.
"We found, for example, that in Cairo, Egypt, if all of the nitrogen resources from wastewater were utilized, the city could cut Egypt's nitrogen fertilizer imports by roughly half," Trimmer said. "This type of approach could also help smallholder farmers in places like Sub-Saharan Africa gain better access to fertilizer than what is currently available."
(Vaikka tuossa puhuttiinkin typestä, laitoin tähän, kun täällä on jo aloitettu tuosta kaupunkien jäteveden hyödyntämisasiasta. Saman tyyppisiä tuloksia on varmaan saatu fosforistakin.)
Tämä on ongelma Suomessakin, mutta sille kuitenkin on jo ratkaisuja, ja uusia on häämöttämässä. Vettä ei kannata kuljettaa:
However, water is challenging to transport because of its weight and relatively low nutrient content, so it is not a good option when nutrients must travel longer distances to reach farmland, the researchers said.
"In some cities, we would need to use more advanced technology to recover a more concentrated product suitable for longer transport distances," Guest said. "These are similar to the crystalized fertilizers that we are accustomed to and, in most cases, the technology to produce these from human waste is well established."
