Combining ozone with biofiltration for advanced wastewater treatment for micropollutant removal: PAPER & PRESENTATION

Duncan Wildgoose, Business Development Manager – Head of Wastewater, Xylem, UK

Uwe Hübner, Process Engineer, Xylem Services, Germany


In a revision of the Urban Wastewater Directive the European Commission introduced for the first time treatment targets for the mitigation of organic micropollutants (OMPs). In addition, minimum requirements for (non-potable) water reuse were recently launched emphasizing the need for new multiobjective advanced treatment strategies. Ozonation and activated carbon (powdered and granular) are most frequently applied technologies for OMPs mitigation on wastewater treatment plants. While ozone alone is effective for the removal of many OMPs, its combination with post-treatment by biologically active filtration (BAF) or biologically active carbon (BAC) is typically recommended to remove easy biodegradable oxidation by-products generated from ozonation. Besides mitigation of by-product formation, the combination of ozone and BAF provides synergies for various treatment targets, and can be beneficial for downstream treatment, e.g., membrane filtration or UV-based advanced oxidation for water reuse. This presentation will introduce the unique features of ozone/BAF and highlight its potential to remove OMPs as well as pathogens and dissolved organic carbon (DOC). Based on recent case studies, we will discuss the automated process control using online UVA sensors, compare posttreatment in BAF vs. BAC filtration, and highlight potential roles of ozone/BAF in water treatment and water resource management.

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