Enhanced Ozonation of Trace Organic Contaminants in Municipal Wastewater Plant Effluent by Adding a Preceding Filtration Step: Comparison and Prediction of Removal Efficiency

Abstract

Ozonation is an efficient method for removing trace organic contaminants (TrOCs) and improving the quality of municipal wastewater plant effluents. Nevertheless, the wide application of ozonation is still challenging because of various wastewater matrices, ozone dose design, and ozone-refractory compounds. An enhanced ozonation supported by adding an additional filtration step was studied to overcome these limitations. A municipal wastewater plant effluent spiked with 6 structurally different TrOCs was employed to investigate the efficiency of TrOCs elimination and water quality improvement when combining ozonation with filtration. A kinetic approach, based on ozone and hydroxyl radicals (•OH) exposure, was used to predict TrOCs abatement and to evaluate ozone dose demand. A significantly more efficient removal of dissolved organic carbon (DOC) was observed when combining ozonation with filtration. Furthermore, the •OH scavenging rate of the effluent matrix was decreased from 6.4 × 10–4 s–1 for conventional ozonation to 1.2 × 10–4 s–1 when combining anion resin filtration (ARF) with ozonation. An improved removal (38% removal at 0.1 g O3/g DOC) of atrazine (which is a typical ozone-refractory compound) was achieved by combining granular activated carbon filtration (GAF) with ozonation compared to stand-alone ozonation (8% removal at 0.5 g O3/g DOC). The measured and predicted elimination demonstrated that the kinetic approach was reliable to predict target contaminants abatement in effluent by use of combined filtration–ozonation systems.

Low-cost mineral packing materials improve DOM and micropollutants removal from landfill leachate in ozonation bubble columns: Insights into the enhancement mechanisms and applicability of surrogate-based monitoring

“…Micropollutants can be oxidized by O3 molecules and/or hydroxyl radicals (  OH) formed during O3 decomposition [23]. Compared with O3-reactive compounds, O3recalcitrant micropollutants are more difficult to degrade [24]. At conditions where these species are effectively removed, more O3-reactive compounds can be already oxidized.…”

“…The initial and residual micropollutants in 20 mL water samples were extracted by 1 mL CH2Cl2 as mentioned in Section 2.3. The following oven program is used according to previous studies [24,30]: the temperature starts from 110 °C for 1 min, and then it rises to 300 °C at 25 °C/min. After that, it increases to 310 °C at 30 °C/min and is kept for 2 min.…”

Small Channels Assembled by Multilayer ZIF-8 in Nanocomposite Membranes for Filtration of Ofloxacin in Water

“…It accumulates in large quantities in the aquatic environment and can cause serious harm to the aquatic environment, thereby affecting human health . There are various techniques for removing antibiotics from water, including biological methods like Membrane bioreactor; , physical methods like adsorption , and membrane filtration technology, , and chemical methods like advanced oxidation method , and photocatalytic oxidation method, Among them, membrane technology has the advantages of fast filtration speed, low space requirements, and reusable saturation. − Membrane technology has great potential in the separation of new pollutants such as antibiotics, while the metal–organic framework (MOF) provides membrane technology with great advantages in the separation of small-molecule-level substances . These methods have their own advantages.…”