In extreme environments, even the most ordinary tasks can seem like unsurmountable challenges. Because of such difficulties, humanity has, for the most part, settled on grounds that were favorable for harvesting crops, herding cattle, and building shelters. But as we seek to expand the limits of human exploration, both on earth and in space, the people pioneering this search will undoubtedly face conditions that, for all intents and purposes, are not conducive to human habitation.
One of the foremost challenges facing any intended long-term settlement, be it in the Antarctic or on Mars (perhaps in the near future), is achieving some degree of autonomy, to enable isolated colonies to survive even in the event of a catastrophic failure in provisioning. And the key to achieving this autonomy is ensuring food sufficiency and self-sustenance. Unsurprisingly, therefore, space agricultural technology is one of the research topics currently being undertaken by the Research Center for Space Colony at Tokyo University of Science. The researchers here hope to spearhead the technological development for safe and sustainable space agriculture—with the aim of sustaining humans for a long time in an extremely closed environment such as a space station.
To this end, an innovative study was conducted by a team of Japanese researchers led by professor Norihiro Suzuki from Tokyo University of Science. This study, published as a "letter," made the front cover of New Journal of Chemistry. In this study, Suzuki and his team aimed to address the problem of food production in closed environments, such as those in a space station.
Realizing that farmers have used animal waste as fertilizer for thousands of years, as a rich source of nitrogen, Suzuki and team have been investigating the possibility of manufacturing it from urea (the main component of urine), to make a liquid fertilizer. This would also simultaneously address the problem of human waste treatment or management in space.
"This process is of interest from the perspective of making a useful product, i.e., ammonia, from a waste product, i.e., urine, using common equipment at atmospheric pressure and room temperature," Suzuki said.
The research team, which also includes Akihiro Okazaki, Kai Takagi, and Izumi Serizawa from ORC Manufacturing Co. Ltd., Japan, devised an electrochemical process to derive ammonium ions (commonly found in standard fertilizers) from an artificial urine sample. Their experimental setup was simple: on one side, there was a reaction cell, with a boron-doped diamond (BDD) electrode and a light-inducible catalyst or photocatalyst material made of titanium dioxide. On the other, there was a counter cell with a simple platinum electrode. As current is passed into the reaction cell, urea is oxidized, forming ammonium ions.
"I joined the 'Space Agriteam' involved in food production, and my research specialization is in physical chemistry; therefore, I came up with the idea of electrochemically making a liquid fertilizer," Suzuki explained.
The research team then examined whether the cell would be more efficient in the presence of the photocatalyst, by comparing the reaction of the cell with and without it. They found that while the initial depletion of urea was more or less the same, the nitrogen-based ions produced varied both in time and distribution when the photocatalyst was introduced. Notably, the concentration of nitrite and nitrate ions was not as elevated in the presence of the photocatalyst. This suggests that the presence of the photocatalyst promoted ammonium ion formation.
"We are planning to perform the experiment with actual urine samples, because it contains not only primary elements (phosphorus, nitrogen, potassium) but also secondary elements (sulfur, calcium, magnesium) that are vital for plant nutrition," Suzuki said.
He and his team are optimistic that this method provides a solid basis for the manufacture of liquid fertilizer in enclosed spaces and, Suzuki observes, "It will turn out to be useful for sustaining long-term stay in extremely closed spaces such as space stations."
Humans inhabiting Mars might still be quite a distant reality, but this study seems to suggest we could be on a path to ensuring sustainability—in space—even before we actually get there.
Republished courtesy of Tokyo University of Science. Photo: Researchers from Japan electrochemically created ammonia from urine to grow plants in space. Credit: Freepik