Establishing the Process Performance Criteria for an Ultraviolet Advanced Oxidation Process - Challenges from Florida’s First Large Scale Groundwater Recharge Facility Design

摘要

The Miami Dade County’s South District Water Reclamation Plant (SDWRP) intends to treattertiary effluent from its South District Wastewater Treatment Plant (SDWWTP) to near demineralizedwater quality that meets the requirements of primary and secondary drinking waterstandards. The proposed SDWRP process train consists of microfiltration (MF), reverse osmosis(RO), ion exchange (IX), ultraviolet advanced oxidation (UV-AO), and water stabilization. TheUV-AO system serves to destroy microconstituents that are not rejected during the RO process.SDWWTP historical effluent data and results from the pilot plant efforts of the proposedtreatment train were evaluated to establish a baseline of the standard pollutant andmicroconstituent concentrations in the UV-AO influent and to develop the system’s processperformance criteria. Due to limitations with the collected data, several conservativeassumptions had to be adopted. The UV-AO design criteria considered projected UV-AOinfluent water quality and the requirements of Title 22 of the California Code of Regulations forgroundwater recharge, and was ultimately set at a 2.0 log NDMA reduction and a 0.5 log 1,4-Dioxane reduction. Utilities that are looking to install similar facilities should plan ahead andstart compiling a robust data set of microconstituents that allows them to establish and negotiatesite specific design criteria.