The ubiquitous occurrences of pharmaceuticals in the environment have resulted to emerging adverse effects to both humans and animals. The integration of chemical and biological processes is deemed as a sound, cost-effective and environment-friendly alternative of removing emerging contaminants such as pharmaceuticals found in municipal wastewaters. This study investigates the impacts of the pre-oxidation treatment using enhanced ozonation by sonolysis (O3/US) on the performance of a membrane bioreactor (MBR) to remove selected pharmaceuticals - diclofenac (DCF), sulfamethoxazole (SMX) and carbamazepine (CBZ). The influence of chemical pre-oxidation in terms of its performance in the membrane fouling control and its biological toxicity were also investigated. The enhanced O3/US using a constant power density of 370 W/L and an ozone flow of 3.3 g/h was employed as the pre-oxidation treatment. The results indicate that the removal efficiencies of MBR with O3/US pre-oxidation were observed to be 83%, 84% and 80%, for DCF, CBZ and SMX, respectively. The transmembrane pressure (TMP) was found to be relatively lower for the MBR with pre-oxidation compared to conventional MBR (without pre-oxidation). Based on the toxicity test results, the O3/US preoxidation did not significantly lead to complete elimination of toxicity in wastewater

Control of emerging compounds in biological treatment of wastewater by advanced pre-oxidation

Naddeo V.;
2015

Abstract

The ubiquitous occurrences of pharmaceuticals in the environment have resulted to emerging adverse effects to both humans and animals. The integration of chemical and biological processes is deemed as a sound, cost-effective and environment-friendly alternative of removing emerging contaminants such as pharmaceuticals found in municipal wastewaters. This study investigates the impacts of the pre-oxidation treatment using enhanced ozonation by sonolysis (O3/US) on the performance of a membrane bioreactor (MBR) to remove selected pharmaceuticals - diclofenac (DCF), sulfamethoxazole (SMX) and carbamazepine (CBZ). The influence of chemical pre-oxidation in terms of its performance in the membrane fouling control and its biological toxicity were also investigated. The enhanced O3/US using a constant power density of 370 W/L and an ozone flow of 3.3 g/h was employed as the pre-oxidation treatment. The results indicate that the removal efficiencies of MBR with O3/US pre-oxidation were observed to be 83%, 84% and 80%, for DCF, CBZ and SMX, respectively. The transmembrane pressure (TMP) was found to be relatively lower for the MBR with pre-oxidation compared to conventional MBR (without pre-oxidation). Based on the toxicity test results, the O3/US preoxidation did not significantly lead to complete elimination of toxicity in wastewater
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4757987
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