Fertilizer Can Be Made From Local Resources Instead of Fossil Fuels

Why It Matters

Local nutrient recovery cuts dependence on imported, gas‑intensive fertilizers, lowering costs for farmers while delivering measurable climate and water‑quality benefits.

Key Takeaways

• Pilot plant converts manure into ammonium sulfate and phosphate salts
• Process cuts nitrous‑oxide emissions by up to 90%
• Local nutrient recovery lowers fertilizer import reliance
• Recovered water can be reused for irrigation
• Integrated biogas improves economic efficiency of recycling

Pulse Analysis

Rising fertilizer prices have exposed the fragility of a supply chain that leans heavily on natural‑gas‑based ammonia production in the Gulf region. About 30% of the world’s nitrogen and phosphorus fertilizers travel through the Strait of Hormuz, making them vulnerable to geopolitical shocks and price spikes that quickly translate into higher food costs. At the same time, traditional wastewater treatment discards valuable nutrients as inert salts or releases them as nitrous‑oxide, a greenhouse gas 265 times more potent than CO₂. These dynamics have accelerated interest in circular, locally sourced fertilizer alternatives that can decouple agriculture from fossil fuel markets.

Fraunhofer IGB’s multi‑stage process tackles the problem at its source. Waste streams rich in nitrogen and phosphorus—liquid manure, biogas‑plant digestate, and municipal effluent—are first acidified to dissolve phosphorus, then split into liquid and solid fractions. Phosphorus is precipitated as high‑purity phosphate salts, while dissolved nitrogen is captured as ammonium sulfate through membrane absorption. The solid residue can be composted or transformed into peat‑like soil conditioners, and the treated water is clean enough for irrigation reuse. Pilot tests have shown up to a 90% reduction in nitrous‑oxide emissions and a substantial cut in fossil‑energy demand, delivering both economic and environmental upside.

The technology opens new business models for a decentralized fertilizer economy. Farmers can join cooperatives to operate small‑scale recovery units, turning waste that would otherwise require costly disposal into market‑ready nutrients. Waste‑water utilities and biogas plant operators gain an additional revenue stream by selling recovered fertilizers and reclaimed water, while municipalities benefit from reduced nutrient loads and lower treatment costs. As European policy increasingly rewards low‑carbon inputs and circular agriculture, the economic case for scaling these systems strengthens, promising a more resilient, locally controlled fertilizer market that safeguards food security and climate goals.