Transformation in Bulk and Trace Organics during Ozonation of Wastewater

Abstract

The aim of this paper is to determine the ozone dosages needed to oxidize bulk and trace organics. Treated effluent from eight full-scale wastewater treatment plants was collected and subjected to lab-scale ozonation. Because both organics and inorganics exert ozone demand, an approach was developed to calculate only the ozone demand associated with organics. This method allowed normalization of dosing parameters to correlate with removal of color, UV absorbance, plus oxidation of trace organics and nitrosamine precursors. We also showed that ozonation effectively reduces the fraction of organic matter characterized as "colloidal organic matter," thereby reducing the potential for membrane fouling.

Continuous ozonation treatment of ofloxacin: Transformation products, water matrix effect and aquatic toxicity

“…STP effluent showed an instantaneous ozone demand of 8.7 mg L −1 , in line with reported values for other wastewaters [45,46]. The organic compounds (DOC = 8.4 mg L −1 ) were mineralized at an extent of 20% at the upper operational condition, consuming 18 mg O 3 L −1 (Fig.…”

Dissolved effluent organic matter: Characteristics and potential implications in wastewater treatment and reuse applications

“…Von Gunten ( 2003) presented a comprehensive review on the use of ozonation with emphasis on oxidation kinetics and reaction mechanisms. Analysis of dE f OM prior to and after ozonation showed that O 3 oxidation does not significantly reduce DOC, however, the aromaticity (represented by SUVA or UV 254 ) was significantly decreased (Linlin et al, 2011;Filloux et al, 2012b;Sharif et al, 2012;Audenaert et al, 2013). Gong et al (2008) observed that during the ozonation of wastewater effluents, O 3 was ineffective in removing DOC because it reacted sequentially with aromatic hydrophobic, transphilic and hydrophilic dE f OM fractions.…”

“…Advanced chemical oxidation processes (AOPs) have been studied over the past 30 years and the scientific literature surrounding their application in the water and wastewater treatment field is quite extensive (Klavarioti et al, 2009). The most common AOPs that have been used and evaluated in the wastewater treatment field with respect to the dE f OM removal are: UV-driven photolysis combined with hydrogen peroxide (H 2 O 2 ) (Audenaert et al, 2013;Gonz alez et al, 2013;Souza et al, 2014;Umar et al, 2015); ozonation and combination of H 2 O 2 with ozone (O 3 ) (Gong et al, 2008;Rosario-Ortiz et al, 2008b;Rosal et al, 2009;Linlin et al, 2011;Filloux et al, 2012b;Gonz ales et al, 2012;Sharif et al, 2012;Audenaert et al, 2013); homogeneous photocatalysis with Fenton reagent (Li et al, 2012(Li et al, , 2013Michael et al, 2012b) and heterogeneous photocatalysis with semiconductor materials such as TiO 2 (Shon et al, 2005;Erdei et al, 2008;Ho et al, 2010). The complex and variable chemical composition and properties of dE f OM have a direct impact on the oxidation processes performance and hence, increased insight into the mechanisms occurring is essential for their optimization and proper control.…”

Sorption of trace organics and engineered nanomaterials onto wetland plant material

“…Determination by HPLC-uorescence/UV Details of E2 and pCBA analysis with HPLC can be found elsewhere. 26 In brief, our liquid chromatography analysis was performed on a Waters 600 series (Milford, MA, USA). Detection was accomplished with a Waters 2475 uorescence detector at an excitation wavelength of 280 nm and an emission wavelength of 310 for E2.…”