Performance of hybrid systems coupling advanced oxidation processes and ultrafiltration for oxytetracycline removal

Abstract

In this study, the efficiency of three different hybrid systems coupling ultrafiltration (UF) with (i) UVC/H 2 O 2 , (ii) UVC/TiO 2 , and (iii) UVC was evaluated for the treatment of a secondary effluent (SE) from a municipal wastewater treatment plant and a surface water (SW) from Miedwie Lake, both spiked with 5 mg L −1 of oxytetracycline (OTC). A ceramic membrane made of TiO 2 was tested. The effect of H 2 O 2 concentration (30 to 120 mg L -1 ) on the UVC/H 2 O 2 -UF system and of P25-TiO 2 loading (0.5 to 1.5 g L -1 ) in suspension on the photocatalytic UVC/TiO 2 -UF system were investigated. A photonic flux of 5.1 J s -1 was provided in all systems. The maximum pure water flux (PWF) was 111 L m -2 h -1 . Adsorption on the photocatalyst particles and/or on the membrane surface was found to be an important contribution for the removal of OTC and dissolved organic carbon (DOC). The UF membrane contributed significantly to photocatalyst and pollutants rejection in the photocatalytic membrane reactor (PMR) with the UVC/TiO 2 system; whereas when using the UVC/H 2 O 2 process, with the highest H 2 O 2 dose, the membrane effect was negligible. Using SE as reaction matrix in the UVC/ TiO 2 -UF system with 1.0 g L -1 of TiO 2 , the complete OTC removal was achieved in 5 h with a mineralization of 49%. For the same reaction period, a DOC removal of 52% was achieved with the UVC/H 2 O 2 -UF system (120 mg H 2 O 2 L -1 ). A similar permeate flux decrease (ca. 40%) was observed in both cases. Furthermore, the highest reduction of permeate flux (60%) was observed when using the UVC-UF system. Using SW as reaction matrix, higher OTC degradation rates and percentage of mineralization were reached for the same reaction period, when compared with SE, due to the lower COD and inorganic salts concentration present in the surface water.

Core–shell TiO2@C ultralong nanotubes with enhanced adsorption of antibiotics

“…There are a number of methods which aim to decrease the amount of antibiotics in the environment, including adsorption, 6 photocatalysis, 7 electrochemical oxidation, 8 advanced oxidation 9 and biodegradation. 10 Among these methods, adsorption is a simple and cheap way to solve the problem of antibiotic pollution and can be divided into two categories: chemisorption and physisorption.…”

Overview of Photocatalytic Membrane Reactors in Organic Synthesis, Energy Storage and Environmental Applications

“…Adsorption on the photocatalyst particles and/or on the ceramic membrane surface was found to contribute significantly for the removal of antibiotic and dissolved organic carbon (DOC). Regardless of feed type, application of photocatalysis led to an increase of permeate flux of about 20% in comparison to the photolysis-UF process [157].…”

“…Hence, the research is mainly focused on the examination of influence of process parameters in relation to fouling alleviation and improvement of treatment efficiency. The PMRs utilizing pressure driven membrane techniques have been applied for removal of different organic compounds, such as natural organic matter (NOM) [46,[151][152][153], pharmaceuticals [50,[154][155][156][157], dyes [158][159][160], phenanthrene [33], and viruses [25] or Cr(VI) [161]. Moreover, application of PMRs for treatment of textile and wood processing industry wastewater [162,163], primary and secondary effluents from municipal wastewater treatment plants [26,148,[164][165][166], and surface waters [167] has been reported.…”

“…The efficiency of three different hybrid systems coupling UF (MWCO of membrane: 10 kDa) and advanced oxidation processes (including TiO 2 photocatalysis) during treatment of SE from a municipal wastewater treatment plant and surface water (SW) spiked with antibiotic, oxytetracycline (OTC), was investigated by Espíndola et al [157]. In the case of SE treated at a TiO 2 loading of 1.0 g L −1 , the OTC was removed completely, and total mineralization was equal to 49%.…”

Kinetics and isotherms of oxytetracycline adsorption on β‐cyclodextrin/carboxymethylcellulose hydrogel films

“…Therefore, reducing the withdrawal period is important for disease prevention. Recently, several methods, such as membrane filtration (Li, Wang, Xiao, & Dong, 2009), photocatalysis (Pereira et al, 2011;Vaizoğullar, 2019), oxidation processes (Espíndola et al, 2019;Liu, He, Fu, & Dionysiou, 2016) and adsorption (Harja & Ciobanu, 2017;Oleszczuk, Pan, & Xing, 2009;Pham, Tran, Pham, Dao, & Le, 2019), have been found to eliminate OTC. Among these methods, adsorption is popular for the removal of antibiotics because of its low cost and easy operation, aided by OTC's small molecular size and similar diameter size of cyclodextrin ring.…”