The production of nutrient-rich compost from food organics and garden organics (FOGO) is a growing international practice in the management of urban organic waste. The production of compost from FOGO requires extensive amounts of clean water at rates ≥2,500 gallon/ton of product. This extensive water use is effective, but when the water percolates through the compost, numerous soluble compounds are dissolved, resulting in the production of leachate rich in salts, nutrients, and organics. Due to FOGO co-contamination with food packaging, plastics, etc., this leachate is  also rich in PFAS (per – and poly-fluoroalkyl substances), meaning that leachate produced at most FOGO composting sites needs to be carefully managed to prevent environmental harm, and is increasingly regulated by environmental authorities worldwide.

This case-study will present the management of PFAS from a full-scale FOGO composting site in Australia and will demonstrate how a novel counter-current foam fractionation technology can cost-effectively separate ≥99.9 % of PFAS from composting leachate — without any chemical additions other than air bubbles — into a super-concentrate for subsequent immobilization or destruction. The presentation will explain the importance of key technical parameters for effective PFAS fractionation and discuss CAPEX and OPEX requirements, allowing the audience to make their own technoeconomic comparisons with other PFAS management alternatives.