Date
Tuesday, July 29, 2025
Time
8:45 AM - 9:15 AM
Location Name
Room 301E
Name
A SCWO Demo: How Supercritical Water Oxidation is Transforming Waste Management in Orlando, FL
Track
Biosolids
Description
The fast-growing City of Orlando, Florida is home to 312,000 people and is recognized as a progressive, sustainability minded community. The City’s Water Reclamation Division of the Public Works Department identified the need to address their reliance on land application as the primary disposal method for wastewater biosolids. Limitations on their ability to land apply biosolids during wet weather via SB 712 combined with potential upcoming limitations due to PFAS necessitated a technology evaluation which yielded supercritical water oxidation (SCWO) as a promising technology for biosolids management. SCWO is a physical thermal process that eliminates organic compounds, such as PFAS, indiscriminately. During SCWO, waste is heated and pressurized above the critical point of water (374deg C and 221 bar) to form supercritical water which, when combined with an oxidant, rapidly oxidizes all organics to produce clean vent gas, water, and minerals. This solution eliminates PFAS in the process products and greatly reduces sludge volumes, fulfilling the two goals of the City. The overarching project goal was to install, commission, and test a SCWO system at the City’s Iron Bridge Water Reclamation Facility. The measures of success for the project included (1) ensuring the timely preparation of the site and delivery/installation of the SCWO unit, (2) passing functional tests, and (3) continuously processing biosolids that meet volume and organics/PFAS reduction targets. To do so, samples were collected prior to influent wastewater screening, between the end of sludge handling and the SCWO inlet, at the effluent of the SCWO unit, and at the effluent of the wastewater treatment process. At each sampling point, relevant parameters including flowrate, chemical oxygen demand, and PFAS (via EPA Method 1633) were assessed and used to evaluate the performance. The extensive sampling plan included baseline testing, system startup testing, and monthly testing. This session will explore the opportunities and challenges of conducting an on-site demonstration of SCWO, using the demonstration at Orlando’s Ironbridge Facility as a case study. The discussion will outline the project’s background, the City’s motivations and planning processes, as well as expectations, risk analysis/mitigation strategies, timelines, and budgeting. In the latter half of the talk, updates on the progress toward meeting project goals and data on the performance of the unit (e.g. PFAS destruction and solids volume reduction) will be presented. Finally, the talk will offer insights on ensuring the successful commercialization of new technologies such as SCWO.