TY - JOUR
T1 - Photo-Fenton disinfection at near neutral pH
T2 - Process, parameter optimization and recent advances
AU - O'Dowd, Kris
AU - Pillai, Suresh C.
N1 - Funding Information:
Prof. Suresh C. Pillai obtained his PhD in the area of Nanotechnology from Trinity College Dublin and then performed his postdoctoral research at California Institute of Technology (Caltech), USA . Upon completion of this appointment he returned to Trinity College Dublin as a Research Fellow before joining CREST-DIT as a Senior Scientist in April 2004. He has joined IT Sligo in 2013 as a senior lecturer in nanotechnology and currently leads the Nanotechnology and Bio-Engineering Research Group. He is the recipient of ‘Boyle-Higgins Award - 2019′ from the Institute of Chemistry Ireland. He is an elected fellow of the UK’s Royal Microscopical Society (FRMS) and the Institute of Materials, Minerals and Mining (FIMMM). He has also completed an executive MBA from Dublin City University, in 2009. Suresh was responsible for acquiring more than €4 million direct R&D funding. He has published several scientific articles in leading peer reviewed journals has contributed to several book chapters, has presented in more than forty international conferences and has delivered over forty international invited talks. Suresh has also been invited to deliver keynote/plenary speeches at various international conferences including "Global Research Efforts on Energy and Nanomaterials (GREEN 2017)", Taipei, Taiwan, 22nd December 2017; International Symposium of Environmental Catalysis (ISEC), South-Central University for Nationalities, Wuhan, China (2016); IWA Symposium on Environmental Nanotechnology in Nanjing, China (2013), the International Green technology conference, India (2013) and the European Photocatalysis conference in Slovania (2013). He is the lead inventor in two granted US patents (awarded in 2013 and 2015) and one UK patent (awarded in 2015) and a number of international patents (pending). His research work was featured in various international media such as BBC World, BBC London, RTE-1 TV, Ocean FM radio and in a number of national and international print media (Times UK, The Guardian, Irish Times etc). Suresh is a recipient of the ‘Industrial Technologies Award 2011′ for licensing functional coatings to Irish companies. He was also the recipient of the ‘Hothouse Commercialisation Award 2009′ from the Minister of Science, Technology and Innovation and also the recipient of the ‘Enterprise Ireland Research Commercialization National Award 2009′. He has also been nominated for the ‘One to Watch’ award 2009 for commercialising R&D work (Enterprise Ireland). One of the nanomaterials based environmental technologies developed by his research team was selected to demonstrate as one of the fifty ‘innovative technologies’ (selected after screening over 450 nominations from EU) at the first Innovation Convention organised by the European Commission on 5-6th December 2011. He is the national delegate and technical expert for ISO standardization committee and European standardization (CEN) committee on photocatalytic materials. He is an associate editor for the Chemical Engineering Journal and Editororial Board Member for the journal Applied Catalysis B (Elsevier).
Funding Information:
This work is carried out as a part of the H2020 project ‘PANIWATER’ under the framework of Indo-EU International water cooperation sponsored jointly by European Commission and Department of Science and Technology , India. The authors would also like to thank Institute of technology Sligo, Ireland for providing research facilities to conduct the research.
Publisher Copyright:
© 2020 The Author(s).
PY - 2020/10
Y1 - 2020/10
N2 - The photo-Fenton process is an advanced oxidation process that uses the hydroxyl radical to disinfect and decontaminate water. Its non-selectivity makes it ideal for the removal of a range of microorganisms including those with antimicrobial resistance. Optimum parameters such as pH, temperature, hydrogen peroxide and iron concentrations and the intensity and wavelength of light irradiation are important to carry out an efficient photo-Fenton process. Traditionally photo-Fenton has been carried out at low acidic pH to obtain greater efficiency, but recent studies have been performed at near neutral. The current review examines the effectiveness of the photo-Fenton process at a near neutral pH for the disinfection of water. The optimal pH was seen to be at 2.8, with the efficiency of the photo-Fenton process decreasing as the pH rises. The optimal reagent concentrations showed considerable variation depending on the iron catalyst used and the iron to hydrogen peroxide concentration used. The effect of irradiance and temperature showed improved efficiency with higher levels. Different types of microorganisms such as E. coli, Pseudomonas sp., Enterococcus faecalis, Klebsiella pneumonia, Salmonella spp., total Coliforms, MRSA, MSSA, B. subtilis, Clostridium sp., Faecal Coliform, MS2 coliphage and Curvularia sp. are also examined and the effect the process will have on them. The design of reactors, such as compound parabolic reactors are also examined. The impact of light sources, including the recent reports on LEDs, on the production of hydrogen peroxide and thereby the improvement in the overall photo-Fenton disinfection is also discussed in detail. Finally, a techno-economic analysis to explain various costs associated with photo-Fenton process has also been carried out. It is concluded that the development of new heterogeneous supported immobilised catalysts that could work at the near neutral pH is an area, which requires considerable future research.
AB - The photo-Fenton process is an advanced oxidation process that uses the hydroxyl radical to disinfect and decontaminate water. Its non-selectivity makes it ideal for the removal of a range of microorganisms including those with antimicrobial resistance. Optimum parameters such as pH, temperature, hydrogen peroxide and iron concentrations and the intensity and wavelength of light irradiation are important to carry out an efficient photo-Fenton process. Traditionally photo-Fenton has been carried out at low acidic pH to obtain greater efficiency, but recent studies have been performed at near neutral. The current review examines the effectiveness of the photo-Fenton process at a near neutral pH for the disinfection of water. The optimal pH was seen to be at 2.8, with the efficiency of the photo-Fenton process decreasing as the pH rises. The optimal reagent concentrations showed considerable variation depending on the iron catalyst used and the iron to hydrogen peroxide concentration used. The effect of irradiance and temperature showed improved efficiency with higher levels. Different types of microorganisms such as E. coli, Pseudomonas sp., Enterococcus faecalis, Klebsiella pneumonia, Salmonella spp., total Coliforms, MRSA, MSSA, B. subtilis, Clostridium sp., Faecal Coliform, MS2 coliphage and Curvularia sp. are also examined and the effect the process will have on them. The design of reactors, such as compound parabolic reactors are also examined. The impact of light sources, including the recent reports on LEDs, on the production of hydrogen peroxide and thereby the improvement in the overall photo-Fenton disinfection is also discussed in detail. Finally, a techno-economic analysis to explain various costs associated with photo-Fenton process has also been carried out. It is concluded that the development of new heterogeneous supported immobilised catalysts that could work at the near neutral pH is an area, which requires considerable future research.
KW - Hydrogen peroxide source
KW - Iron source
KW - Microorganism strain
KW - Photo fenton
KW - Reagent concentrations
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U2 - 10.1016/j.jece.2020.104063
DO - 10.1016/j.jece.2020.104063
M3 - Review article
AN - SCOPUS:85089275486
SN - 2213-3437
VL - 8
JO - Journal of Environmental Chemical Engineering
JF - Journal of Environmental Chemical Engineering
IS - 5
M1 - 104063
ER -