Paracetamol and ibuprofen removal from aqueous solutions by ozonation and photochemical processes

Abstract

The comparative experimental study has been performed of removal of pharmaceuticals such as paracetamol and ibuprofen from aqueous solution by ozonation and photochemical degradation in several types of reactors. Ozone, oxygen, and hydrogen peroxide were used as oxidizing agents. Heterogeneous photocatalysis was carried out in the presence of anatase type TiO2 catalyst. To determine the amount of radiation emitted by the UV lamps and transferred into the reactor, chemical feroxioxalate actinometric experiments were performed. The degree of the pollutant removal was monitored by HPLC, COD, BOD5, and TOC. An ecotoxic biological test of process products with Parachlorella kessleri was also evaluated. The results indicate that the removal of both pharmaceuticals is most effective by heterogeneous photocatalysis. In the UV processes, the degradation rate increased considerably when H2O2 was added. However, the addition of peroxide into the ozonation system improved the ozonation only slightly. All products of the processes tested showed improved biodegradability according to the BOD5/COD ratio and low toxicity to Parachlorella kessleri.

Enhanced UV Direct Photolysis and UV/H2O2 for Oxidation of Triclosan and Ibuprofen in Synthetic Effluent: an Experimental Study

“…Trousil et al ( 2018 ) also obtained low TOC removal values for IBU degradation, about 20.37% in direct photolysis system and 30.09% in UV/TiO 2 system after 1-h irradiation. The removal of TOC in the oxidation of IBU may be related to the continuous formation of small carboxylic acids during the process (Szabó et al, 2011 ).…”

“…Trousil et al reported E EO of 136.2 kWh dm −3 using 11 W power UV lamp in a volume of 20 dm −3 and a concentration of 20 mg dm −3 of IBU in a recirculating reactor. When using the UV/H 2 O 2 system with concentration of 0.5 g dm −3 of oxidant, the energy required for degradation of 90% of the contaminant went to order of 61.2 kWh dm −3 , a 55.1% reduction in energy consumption (Trousil et al, 2018 ).…”

Enhanced UV Direct Photolysis And UV/H2O2 For Oxidation of Triclosan And Ibuprofen In Synthetic Effluent: An Experimental Study

“…In pH 6.0 system TCS obtained 40.63% of TOC removal after 75 min, while for IBU about 10.26% was obtained. Trousil et al (2018) also obtained low TOC removal values for IBU degradation, about 20.37% in direct photolysis system and 30.09% in UV/TiO2 system after 1h irradiation. The removal of TOC in the oxidation of IBU may be related to the continuous formation of small carboxylic acids during the process (Szabó et al 2011).…”

“…Trousil et al reported EEO of 136.2 kWh dm -3 using 11W power UV lamp in a volume of 20dm -3 and a concentration of 20mg dm -3 of IBU in a recirculating reactor. When using the UV/H2O2 system with concentration of 0.5 g dm -3 of oxidant, the energy required for degradation of 90% of the contaminant went to order of 61.2 kWh dm -3 , a 55.1% reduction in energy consumption (Trousil et al 2018). UV/H2O2 (10 mg L -1 ) pH 6.0 71.26 6.40 UV/H2O2 (5 mg L -1 ) pH 6.0…”