| Abstract | Photo-Fenton process is among the most effective advanced oxidation processes (AOPs) in urban
wastewater treatment and disinfection, but its application as tertiary treatment at full scale has not been
a feasible/attractive option so far because optimum conditions are typically achieved under acidic pH. In
this work a new photo Fenton like process (UV-C/H2O2/IDS-Cu) using iminodisuccinic acid (IDS)-Cu
complex as catalyst, was compared to other processes (UV-C/H2O2/Cu, UV-C/H2O2/Fe, H2O2 and UV-C) in
urban wastewater disinfection. Since this is the first time that IDS-Cu complex was isolated and used as
catalyst, preliminary tests to evaluate the mineralization of a model compound (phenol, 25 mg L1 initial
concentration) in water by UV-C/H2O2/IDS-Cu were carried out. Almost complete mineralization of
phenol (95%) was observed after 60 min treatment, being the process more effective than all other
investigated AOPs (Fenton and photo-Fenton processes). This process was also proven to be more
effective in the inactivation of E. coli (complete inactivation (3.5 log units) in 10 min) at natural pH
(7.8 ± 0.5) in real wastewater, than the other processes investigated. Unlike of what observed for E. coli
inactivation, the investigated processes only partially inactivated total bacterial population (from 18% for
UV-C to 43% for UV-C/H2O2/Cu), according to flow cytometry measurements. In particular, Cu based
photo-Fenton processes resulted in the higher percentage of inactivated total cells, thus being consistent
with the results of E. coli inactivation. It is worthy to note that, as H2O2 was decreased, UV-C/H2O2/Cu-IDS
was more effective than UV-C/H2O2/Cu process. Moreover, the formation of small and large clusters
decreased in the presence of Cu and Cu-IDS complex, and process efficiency improved accordingly; these
results show that Cu based AOPs can more effectively disaggregate clusters, thus making disinfection
process more effective than Fe based AOPs. |
| Authors | Antonino Fiorentino, Raffaele Cucciniello, Andrea Di Cesare, Diego Fontaneto, Prisco Prete, Luigi Rizzo, Gianluca Corno, Antonio Proto |
| Text | 392287 2018 10.1016/j.watres.2018.08.024 Scopus 2 s2.0 85054678156 ISI Web of Science WOS WOS 000452565400019 wastewater Disinfection of urban wastewater by a new photo Fenton like process using Cu iminodisuccinic acid complex as catalyst at neutral pH Antonino Fiorentino, Raffaele Cucciniello, Andrea Di Cesare, Diego Fontaneto, Prisco Prete, Luigi Rizzo, Gianluca Corno, Antonio Proto Microbial Ecology Group, National Research Council of Italy, Institute of Ecosystem Study, Largo Tonolli 50, 28922, Verbania, Italy Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano SA , Italy Department of Chemistry and Biology Adolfo Zambelli , University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano SA , Italy Department of Earth, Environmental, and Life Sciences, University of Genoa, 16132, Genoa, Italy Photo Fenton process is among the most effective advanced oxidation processes AOPs in urban wastewater treatment and disinfection, but its application as tertiary treatment at full scale has not been a feasible/attractive option so far because optimum conditions are typically achieved under acidic pH. In this work a new photo Fenton like process UV C/H2O2/IDS Cu using iminodisuccinic acid IDS Cu complex as catalyst, was compared to other processes UV C/H2O2/Cu, UV C/H2O2/Fe, H2O2 and UV C in urban wastewater disinfection. Since this is the first time that IDS Cu complex was isolated and used as catalyst, preliminary tests to evaluate the mineralization of a model compound phenol, 25 mg L1 initial concentration in water by UV C/H2O2/IDS Cu were carried out. Almost complete mineralization of phenol 95% was observed after 60 min treatment, being the process more effective than all other investigated AOPs Fenton and photo Fenton processes . This process was also proven to be more effective in the inactivation of E. coli complete inactivation 3.5 log units in 10 min at natural pH 7.8 ± 0.5 in real wastewater, than the other processes investigated. Unlike of what observed for E. coli inactivation, the investigated processes only partially inactivated total bacterial population from 18% for UV C to 43% for UV C/H2O2/Cu , according to flow cytometry measurements. In particular, Cu based photo Fenton processes resulted in the higher percentage of inactivated total cells, thus being consistent with the results of E. coli inactivation. It is worthy to note that, as H2O2 was decreased, UV C/H2O2/Cu IDS was more effective than UV C/H2O2/Cu process. Moreover, the formation of small and large clusters decreased in the presence of Cu and Cu IDS complex, and process efficiency improved accordingly; these results show that Cu based AOPs can more effectively disaggregate clusters, thus making disinfection process more effective than Fe based AOPs. 146 Published version https //www.sciencedirect.com/science/article/pii/S0043135418306444 via%3Dihub antonino 2018_WatRes_Fiorentino et al.pdf Articolo in rivista Pergamon Press. 0043 1354 Water research Oxf. Water research Oxf. Water res. Oxf. Water research. Oxf. gianluca.corno CORNO GIANLUCA diego.fontaneto FONTANETO DIEGO andrea.dicesare DI CESARE ANDREA |
