Prediction of advanced oxidation performance in UV/H2O2 reactor systems with LP-UV lamps

2011 ◽  
Vol 11 (4) ◽  
pp. 460-467 ◽  
Author(s):  
C. H. M. Hofman-Caris ◽  
D. J. H. Harmsen ◽  
B. A. Wols ◽  
L. J. J. M. Janssen ◽  
E. F. Beerendonk ◽  
...  
Keyword(s):  
Drinking Water ◽  
Drinking Water Treatment ◽  
Advanced Oxidation ◽  
Design Tool ◽  
Operating Conditions ◽  
Reactor Performance ◽  
Water Characteristics ◽  
Oxidation Performance ◽  
H2o2 Oxidation ◽  
Uv Lamps

Advanced oxidation processes, like UV/H2O2 oxidation, are important barriers against organic micro pollutants in drinking water treatment. In order to guarantee safe drinking water, it is important to be able to predict the reactors' performance to adjust the operating conditions to the actual influent water characteristics (like UV transmission) and lamp performance. Therefore, a design tool was developed, which is based on a kinetic model that describes and predicts the direct photolysis and oxidation of organic compounds in pilot experiments, using Low Pressure (LP) UV-lamps. This model has been combined with computational fluid dynamics (CFD), in order to be able to accurately predict the results of pilot and full scale installations, and also to design reactor systems. The model was applied to three model compounds (atrazine, ibuprofen and NDMA) in two different pilot reactors, and it has been shown that reactor performance can be fairly predicted by applying this ‘UVPerox’ model. The model takes into account the water quality and power of the lamps, and the properties of the compounds involved.

scholarly journals The Role of Catalytic Ozonation Processes on the Elimination of DBPs and Their Precursors in Drinking Water Treatment

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 521
Author(s):  
Fernando J. Beltrán ◽  
Ana Rey ◽  
Olga Gimeno
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Humic Substances ◽  
Hypochlorous Acid ◽  
Drinking Water Treatment ◽  
Disinfection Byproducts ◽  
Catalytic Ozonation ◽  
Operating Conditions ◽  
Halogen Compounds ◽  
Radiation Sources

Formation of disinfection byproducts (DBPs) in drinking water treatment (DWT) as a result of pathogen removal has always been an issue of special attention in the preparation of safe water. DBPs are formed by the action of oxidant-disinfectant chemicals, mainly chlorine derivatives (chlorine, hypochlorous acid, chloramines, etc.), that react with natural organic matter (NOM), mainly humic substances. DBPs are usually refractory to oxidation, mainly due to the presence of halogen compounds so that advanced oxidation processes (AOPs) are a recommended option to deal with their removal. In this work, the application of catalytic ozonation processes (with and without the simultaneous presence of radiation), moderately recent AOPs, for the removal of humic substances (NOM), also called DBPs precursors, and DBPs themselves is reviewed. First, a short history about the use of disinfectants in DWT, DBPs formation discovery and alternative oxidants used is presented. Then, sections are dedicated to conventional AOPs applied to remove DBPs and their precursors to finalize with the description of principal research achievements found in the literature about application of catalytic ozonation processes. In this sense, aspects such as operating conditions, reactors used, radiation sources applied in their case, kinetics and mechanisms are reviewed.

Development of a hybrid ozonation biofilm-membrane filatration process for the production of drinking water

2005 ◽  
Vol 51 (6-7) ◽  
pp. 241-248 ◽  
Author(s):  
T. Leiknes ◽  
M. Lazarova ◽  
H. Ødegaard
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
High Speed ◽  
Membrane Surface ◽  
Drinking Water Treatment ◽  
Rotating Disk ◽  
Operating Conditions ◽  
Operating Modes ◽  
High Concentrations ◽  
Biomass Separation

Drinking water sources in Norway are characterized by high concentrations of natural organic matter (NOM), low alkalinity and low turbidity. The removal of NOM is therefore a general requirement in producing potable water. Drinking water treatment plants are commonly designed with coagulation direct filtration or NF spiral wound membrane processes. This study has investigated the feasibility and potential of a hybrid process combining ozonation and biofiltration with a rotating disk membrane for treating drinking water with high NOM concentrations. Ozonation will oxidize the NOM content removing colour and form biodegradable organic compounds, which can be removed in biological filters. A constructed water was used in this study which is representative of ozonated NOM-containing water. A rotating membrane disk bioreactor downstream the ozonation process was used to carry out both the biodegradation as well as biomass separation in the same reactor. Maintenance of biodegradation of the organic matter while controlling biofouling of the membrane and acceptable water production rates was the focus in the study. Three operating modes were investigated. Removal of the biodegradable organics was consistent throughout the study indicating that sufficient biomass was maintained in the reactor for all operating conditions tested. Biofouling control was not achieved through shear-induced cleaning by periodically rotating the membrane disks at high speed. By adding a small amount of sponges in the membrane chamber the biofouling could be controlled by mechanical cleaning of the membrane surface during disk rotation. The overall results indicate that the system can favorably be used in an ozonation/biofiltration process by carrying out both biodegradation as well as biomass separation in the same reactor.

Prediction of advanced oxidation performance in various pilot UV/H2O2 reactor systems with MP- and LP- and DBD-UV lamps

2012 ◽  
Vol 210 ◽  
pp. 520-528 ◽  
Author(s):  
Roberta C.H.M. Hofman-Caris ◽  
Danny J.H. Harmsen ◽  
Erwin F. Beerendonk ◽  
Ton H. Knol ◽  
Corine J. Houtman ◽  
...  
Keyword(s):  
Advanced Oxidation ◽  
Oxidation Performance ◽  
Uv Lamps

Quenching H2O2 residuals after UV/H2O2 oxidation using GAC in drinking water treatment

2018 ◽  
Vol 4 (10) ◽  
pp. 1662-1670 ◽  
Author(s):  
Yifeng Huang ◽  
Zhijie Nie ◽  
Chengjin Wang ◽  
Yi Li ◽  
Mindy Xu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Drinking Water ◽  
Activated Carbon ◽  
Water Treatment ◽  
Drinking Water Treatment ◽  
Granular Activated Carbon ◽  
Pilot Scale ◽  
H2o2 Oxidation

Pilot-scale and lab-scale experiments were performed to evaluate the ability of granular activated carbon (GAC) to quench hydrogen peroxide (H2O2).

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