Phosphorus runoff from farms is a major contributor to water pollution, driving algae blooms and damaging ecosystems. To address this issue, researchers at the University of Illinois Urbana-Champaign have developed biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More pellets designed to capture phosphorus from drainage systems commonly used on Midwest farms. These “designer” biochar pellets, made from sawdust and lime sludge, are a sustainable, cost-effective solution for managing phosphorus.

Field trials in Illinois showed that the pellets effectively remove phosphorus, with smaller pellets (1 cm or less) achieving removal rates as high as 38-41%—compared to 1.3-12% for larger pellets. The smaller size enhances phosphorus binding, while the pellet form prevents the material from washing away, a common issue with powdered biochar.

Beyond affordability, the pellets have significant environmental benefits. They cost $413 per ton to produce, roughly half the cost of traditional phosphorus filters, and can offset up to 200 kg of carbon dioxide per kilogram of phosphorus removed. Farmers can reuse spent pellets as a slow-release fertilizer, recycling nutrients back into the fields.

By integrating biochar pellets into existing drainage systems, farmers could effectively reduce phosphorus runoff and support sustainable practices. This innovation offers a practical solution for conservation-minded farmers looking to reduce nutrient losses, enhance soil health, and cut down on fertilizer costs.

LEARN MORE: New Biochar Technology Helps Farmers Capture and Reuse Phosphorus