scholarly journals Advanced Oxidation Process Based Water Disinfection- the Microbiology Beyond Bacterial Inactivation

2020 ◽  
Author(s):  
Habeeb Rahman A.P ◽  
Amrita Mishra ◽  
Cecilia Stålsby Lundborg ◽  
Suraj Kumar Tripathy
Keyword(s):  
Advanced Oxidation Process ◽  
Advanced Oxidation ◽  
Vital Role ◽  
Water Disinfection ◽  
Resistant Bacteria ◽  
Successful Implementation ◽  
Bacterial Inactivation ◽  
Bacterial Survival ◽  
Bacterial Adaptation ◽  
Hostile Environments

Different water treatment regiments are revealed to have potential in enriching antibiotic resistant bacteria (ARB). Advanced oxidation processes (AOPs) based disinfection techniques have been studied widely in the recent times due to their advantages over conventional treatment methods. However, bacterial response and adaptations against the hostile environments of AOPs is not clearly understood yet. Based on the existing knowledge on the ways in which bacteria surpass the antibiotic treatment, here we propose few important aspects of bacterial adaptation which could be true for AOPs as well since both antibiotics and AOPs generate reactive oxygen species (ROS) during their modes of action. We discuss the plausible role of ROS in the selection of ARB and bacterial heterogeneity as a strategy to bypass the lethal action of AOPs. Understanding bacterial adaptation during disinfection plays a vital role in devising strategies to outclass the bacterial survival. Hence, more importance should be given to such studies in the near future for the successful implementation of AOPs.

Electrochemical advanced oxidation process using DiaChem®electrodes

2004 ◽  
Vol 49 (4) ◽  
pp. 207-212 ◽  
Author(s):  
I. Tröster ◽  
L. Schäfer ◽  
M. Fryda ◽  
T. Matthée
Keyword(s):  
Drinking Water ◽  
Hydroxyl Radicals ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Chemical Vapour ◽  
Advanced Oxidation ◽  
Water Disinfection ◽  
Efficient Production ◽  
Boron Doped Diamond ◽  
Electrochemical Window

The electrochemical advanced oxidation process (EAOP) using boron doped diamond (DiaChem®, registered trademark of Condias GmbH) has been studied for wastewater treatment and drinking water disinfection. DiaChem® electrodes consist of preferentially metallic base materials coated with a conductive polycrystalline diamond film by hot-filament chemical vapour deposition. They exhibit high overpotential for water electrolysis as well as high chemical inertness and extended lifetime. In particular the high overpotential for water decomposition opens the widest known electrochemical window, allowing the energy efficient production of hydroxyl radicals directly from aqueous solutions. The hydroxyl radicals on the other hand are effectively used for the oxidation of pollutants. The EAOP using DiaChem® electrodes thus facilitates the direct and, if necessary, complete decomposition of even hazardous or persistent pollutants in different wastewaters. Current efficiencies of more than 90%, also without the use of additives for hydroxyl radical generation, have been demonstrated. Additionally, for drinking water preparation diamond electrodes facilitate disinfection with and without the support of chlorine.

Inactivation of Pseudomonas aeruginosa in electrochemical advanced oxidation process with diamond electrodes

2011 ◽  
Vol 63 (9) ◽  
pp. 2010-2016 ◽  
Author(s):  
M. Griessler ◽  
S. Knetsch ◽  
E. Schimpf ◽  
A. Schmidhuber ◽  
B. Schrammel ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Flow Rate ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Electrical Current ◽  
Water Disinfection ◽  
Low Flow ◽  
Diamond Electrodes ◽  
Direct Electrical Current

The electrochemical advanced oxidation process (EAOP) with diamond electrodes may serve as an additional technology to the currently approved methods for water disinfection. Only few data exist on the microbicidal effect of the EAOP. The aim of our study was to investigate the microbicidal effect of a flow-through oxidation cell with diamond electrodes, using Pseudomonas aeruginosa as the test organism. Without electrical current the EAOP had no measurable effect on investigated microbiological and chemical parameters. For direct electrical current a stronger impact was observed at low flow rate than at higher flow rate. Depending on the contact time of the oxidants and the type of quenching reagent added, inactivation of P. aeruginosa was in the range log 1.6–3.6 at the higher flow rate and log 2.4–4.4 at the lower rate. Direct electrical current showed a stronger microbicidal effect than alternating current (maximum reduction log 4.0 and log 2.9, respectively). The microbiological results of experiments with this EAOP prototype revealed higher standard deviations than expected, based on our experience with standard water disinfection methods. Safe use of an EAOP system requires operating parameters to be defined and used accurately, and thus specific monitoring tests must be developed.

Influence of mineral water constituents, organic matter and water matrices on the performance of the H2O2/IO4−-advanced oxidation process

2019 ◽  
Vol 5 (11) ◽  
pp. 1985-1992 ◽  
Author(s):  
Nor Elhouda Chadi ◽  
Slimane Merouani ◽  
Oualid Hamdaoui ◽  
Mohammed Bouhelassa ◽  
Muthupandian Ashokkumar
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Mineral Water ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Water Constituents

We have recently reported that the reaction of H2O2/IO4− could be a new advanced oxidation process for water treatment [N. E. Chadi, S. Merouani, O. Hamdaoui, M. Bouhelassa and M. Ashokkumar, Environ. Sci.: Water Res. Technol., 2019, 5, 1113–1123].

scholarly journals Simultaneous Disinfection and Organic Microcontaminant Removal by UVC-LED-Driven Advanced Oxidation Processes

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1507
Author(s):  
Sara Miralles-Cuevas ◽  
Irene De la Obra ◽  
Elizabeth Gualda-Alonso ◽  
Paula Soriano-Molina ◽  
José L. Casas López ◽  
...  
Keyword(s):  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Scaling Up ◽  
Bactericidal Effect ◽  
Secondary Effluent ◽  
Bacterial Inactivation ◽  
Bacterial Regrowth ◽  
Oxidation Processes ◽  
Bacteria Inactivation ◽  
Simulated Wastewater

This work presents the comparison of four advanced oxidation processes driven by UVC-LED radiation (278 nm—2 W/m2) for simultaneous bacteria inactivation (Escherichia coli—106 CFU/mL) and microcontaminant removal (imidacloprid—50 µg/L) in simulated wastewater secondary effluent. To this end, the activation of H2O2 and S2O82− as precursors of HO• and SO4•−, respectively, by UVC-LED and UVC-LED/Fe3+–NTA (ferric nitrilotriacetate at 0.1 mM) has been studied at different oxidant concentrations. For the purpose of comparison, conventional chlorination was used as the baseline along with bacterial regrowth 24 h after treatment. Disinfection was achieved within the first 30 min in all of the processes, mainly due to the bactericidal effect of UVC-LED radiation. UVC-LED/H2O2 did not substantially affect imidacloprid removal due to the low HO• generation by UVC irradiation at 278 nm, while more than 80% imidacloprid removal was achieved by the UVC-LED/S2O82−, UVC-LED/Fe3+–NTA/S2O82−, and UVC-LED/Fe3+–NTA/H2O2 processes. The most efficient concentration of both oxidants for the simultaneous disinfection and microcontaminant removal was 1.47 mM. Chlorination was the most effective treatment for bacterial inactivation without imidacloprid removal. These findings are relevant for scaling up UVC-LED photoreactors for tertiary wastewater treatment aimed at removing bacteria and microcontaminants.

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