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US Farmers Use Urine as Fertilizer in Innovative Environmental Project: Initiative by the Rich Earth Institute Involves Over 250 Residents and Promotes Nutrient Recycling to Boost Sustainable Agricultural Production.
In the state of Vermont, in the United States (U.S.), a pioneering project has drawn attention for its innovation and positive environmental impact: farmers use urine as fertilizer to increase agricultural production. The initiative, led by the Rich Earth Institute, already involves over 250 residents of Windham County, who voluntarily donate their urine to be used on local farms.
Betsy Williams, one of the program participants, states that the idea of recycling nutrients that leave the human body makes sense. “We are consuming food with nutrients, and many of them can be reused. To me, it makes sense,” she declared.
Collection and Treatment of Urine Before Application to Soil
The collected urine goes through a controlled process before arriving at the farms. A truck collects about 45,000 liters per year, which are taken to a tank where the liquid is pasteurized at 80 °C for 90 seconds. Then, the treated urine is stored until the right moment to be applied to agricultural soil.
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Application occurs during specific stages of the plant cycle when they are most capable of absorbing the nutrients present in urine. This practice prevents excess runoff to rivers and lakes, which could cause environmental imbalances.
Why U.S. Farmers Are Adopting the Use of Urine
The use of urine as fertilizer is driven by its high nitrogen and phosphorus content, the same elements found in common synthetic fertilizers. However, the production of these artificial inputs generates significant environmental impact. The nitrogen manufacturing process consumes fossil fuels, while phosphorus extraction generates toxic waste.
In this context, urine appears as a sustainable, cost-free, and widely available alternative. As highlighted by the director of the Rich Earth Institute, Jamina Shupack: “Everyone pees. It’s an untapped resource.”
Reduction of Water Use and Carbon Emissions
Professor Nancy Love from the University of Michigan has been collaborating with the project since 2012 and concluded that reusing urine instead of sending it to the sewage system reduces water consumption and greenhouse gas emissions. By eliminating the use of conventional toilets, the program estimates that it has saved over 10 million liters of water since its inception.
“Today, we dilute our urine as much as possible, send it for treatment, consume energy, and return it to the environment. It’s an inefficient process,” Love explained.
Prevention of Algae Proliferation and Protection of Water Resources
The common destination of treated urine through sewage systems is waterways. However, the nutrients in urine, such as nitrogen and phosphorus, can feed harmful algae, which disrupt aquatic ecosystems. Therefore, farmers and researchers see the application of urine to soil as a way to prevent river contamination while simultaneously increasing agricultural productivity.
“Nitrogen will always make the plants grow, whether in water or in soil. The secret is where we apply these nutrients,” Shupack stated.
Adoption in Other Countries and Regulatory Challenges
Although the Vermont program is a reference in the U.S., similar initiatives are being developed in other countries. In Paris, France, volunteers collect urine to fertilize the wheat used in baking. In Sweden, companies are turning urine into fertilizer to combat algae proliferation.
In South Africa, Nepal, and Niger, pilot projects are also investigating the feasibility of using urine in agriculture. However, regulatory and logistical obstacles hinder expansion. “Often, there isn’t even a specific form to deal with urine, which makes the process bureaucratic,” Shupack reported.
Innovations in Urine Transport and Treatment
To overcome logistical challenges, the Rich Earth Institute has developed a concentration system through freezing, which reduces the volume of urine by up to six times. The technology is already in use at the University of Michigan.
Another barrier is adapting the plumbing infrastructure in the U.S. Many building systems are not equipped to separate urine at the source, requiring changes in construction standards and new sanitation designs.
Behavior Change for Technology Application in the U.S.
Betsy Williams began donating urine using detergent bottles and transporting the containers in her car. Recently, she installed a toilet at home that separates urine from other waste, with storage in the basement. “Now everything is simpler. And dealing with urine has become less unpleasant,” she said.
According to the Institute, the so-called “notion of disgust” is not as decisive as one might think. “People are receptive to the idea, but they think others will find it strange,” Shupack said.
Regarding the presence of medications in urine, preliminary studies indicate extremely low levels in cultivated plants. “One would have to eat absurd amounts of lettuce daily to equal a cup of coffee,” the director exemplified.
Source: G1
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