Effects of bromide on UV/chlorine advanced oxidation process

2009 ◽  
Vol 9 (6) ◽  
pp. 627-634 ◽  
Author(s):  
Q. Zhao ◽  
C. Shang ◽  
X. Zhang
Keyword(s):  
Natural Organic Matter ◽  
Hydroxyl Radicals ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Quantum Yields ◽  
High Quantum Yield ◽  
Considerable Decrease ◽  
Oxidation Processes

High quantum yield (1.4 mol Es−1) of hydroxyl radicals (∙OH) from photolysis of chlorine under typical disinfection conditions indicates the potential of UV/chlorine coexposure in serving as both disinfection and advanced oxidation processes (AOP). In this study, photolysis of chlorine and bromine was explored in buffer and simulated natural water solutions under low-pressure UV (LPUV) and medium-pressure UV (MPUV) lamps. At pH 6.5 and 8.5, the quantum yields of bromine photolysis were 3.8 and 0.6 for MPUV, and 4.4 and 0.8 for LPUV, respectively. At pH 6.5, the photolysis of bromine was faster than that of chlorine under either MPUV or LPUV source, while at a higher pH of 8.5, the contrary was found. For all conditions tested, the presence of bromide did not significantly change the observed photolysis rate of total free halogen during the UV/chlorine process in the presence or absence of natural organic matter. Upon UV irradiation, chlorine always produces higher ∙OH concentration than bromine does. The presence of bromide results in considerable decrease of ∙OH concentration at pH 6.5, compared to that obtained from the UV/chlorine process in the absence of bromide.

An insight into the effective advanced oxidation process for treatment of simulated textile dye waste water

RSC Advances ◽  
2014 ◽  
Vol 4 (75) ◽  
pp. 39941-39947 ◽  
Author(s):  
Jhimli Paul Guin ◽  
D. B. Naik ◽  
Y. K. Bhardwaj ◽  
Lalit Varshney
Keyword(s):  
Waste Water ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Textile Dye ◽  
Oxidation Processes ◽  
Insight Into

The comparison in the extent of % mineralization of Simulated Textile Dye Waste Water (STDWW) in three Advanced Oxidation Processes.

scholarly journals Decomplexation of electroplating wastewater by ozone-based advanced oxidation process

2018 ◽  
Vol 79 (3) ◽  
pp. 589-596 ◽  
Author(s):  
Zhuoyue Wang ◽  
Ji Li ◽  
Wei Song ◽  
Xiaolei Zhang ◽  
Jiangyu Song
Keyword(s):  
Citric Acid ◽  
Advanced Oxidation Processes ◽  
Heavy Metal Contamination ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Ethylenediaminetetraacetic Acid ◽  
Advanced Oxidation ◽  
Electroplating Wastewater ◽  
Oxidation Processes ◽  
Terrestrial Life

Abstract Heavy metal contamination from electroplating wastewater is a serious risk to terrestrial life and public health. The complexed metal cannot be effectively removed by traditional precipitation without decomplexing. In this work, four ozone-based advanced oxidation processes, O3, O3/H2O2, O3/UV and O3/H2O2/UV to decomplex electroplating wastewater were investigated and their performance compared. Ethylenediaminetetraacetic acid (EDTA) and citric acid are the most common components of electroplating wastewater. They were used as representatives to study the decomplexation and mineralization of complexes in the ozone-based advanced oxidation processes. Among all, the highest degradation and mineralization efficiency of EDTA occurred in O3/UV and was 65% and 53% in 60 min, respectively. For citric acid, the highest degradation (77%) and mineralization (56%) efficiency was observed in the O3/H2O2/UV process. This indicates that selection of the advanced oxidation process is determined by the target contaminant.

Advanced oxidation process–biological system for wastewater containing a recalcitrant pollutant

2007 ◽  
Vol 55 (12) ◽  
pp. 229-235 ◽  
Author(s):  
I. Oller ◽  
S. Malato ◽  
J.A. Sánchez-Pérez ◽  
M.I. Maldonado ◽  
W. Gernjak ◽  
...  
Keyword(s):  
Advanced Oxidation Processes ◽  
Advanced Oxidation Process ◽  
Catalyst Concentration ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Ozone Treatment ◽  
Saline Wastewater ◽  
Oxidation Processes ◽  
Oxidative Processes ◽  
Parabolic Collector

Two advanced oxidation processes (AOPs), ozonation and photo-Fenton, combined with a pilot aerobic biological reactor at field scale were employed for the treatment of industrial non-biodegradable saline wastewater (TOC around 200 mg L−1) containing a biorecalcitrant compound, α-methylphenylglycine (MPG), at a concentration of 500 mg L−1. Ozonation experiments were performed in a 50-L reactor with constant inlet ozone of 21.9 g m−3. Solar photo-Fenton tests were carried out in a 75-L pilot plant made up of four compound parabolic collector (CPC) units. The catalyst concentration employed in this system was 20 mg L−1 of Fe2 +  and the H2O2 concentration was kept in the range of 200–500 mg L−1. Complete degradation of MPG was attained after 1,020 min of ozone treatment, while only 195 min were required for photo-Fenton. Samples from different stages of both AOPs were taken for Zahn–Wellens biocompatibility tests. Biodegradability enhancement of the industrial saline wastewater was confirmed (>70% biodegradability). Biodegradable compounds generated during the preliminary oxidative processes were biologically mineralised in a 170-L aerobic immobilised biomass reactor (IBR). The global efficiency of both AOP/biological combined systems was 90% removal of an initial TOC of over 500 mg L−1.

scholarly journals ADVANCED OXIDATION PROCESS (AOPS) FOR MICROPOLLUTANT TREATMENT: A REVIEW

2017 ◽  
Vol 14 (27) ◽  
pp. 65-74
Author(s):  
Fernando J. M. KUFFEL ◽  
Cassiano R. BRANDT ◽  
Daniel KUHN ◽  
Clarice STEFFENS ◽  
Simone STULP ◽  
...  
Keyword(s):  
Advanced Oxidation Processes ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Complex Structure ◽  
Advanced Oxidation ◽  
New Order ◽  
Oxidation Processes ◽  
Rivers And Lakes ◽  
Application Characteristics ◽  
Made In

The growing preoccupation about drinking water quality available on earth, a new order of emergent pollutants in rivers and lakes has called the attention of the scientific community, the micropollutants. These compounds come from the irregular or involuntary ejectment of substances such as pesticides, drugs, insecticides and other into the nature. By having a complex structure, the micropollutants have high resistance over the traditional water treatment to human consume. Thus, alternatives methodologies to their degradation have been studied, such as advanced oxidation process (AOPs). The AOPs are based in the formation of hydroxyls radicals (OH-) highly reactive that degrade complexes substances into lesser aggressive products as CO2 and water. Even though many methods to generate hydroxyls radicals from advanced oxidation processes exist, they differentiate on the application and viability. This review shows different methodologies using AOPs and their respective application characteristics, also some works already made in complexes substances treatment, which prove their efficiency.

The performance of a sulfate-radical mediated advanced oxidation process in the degradation of organic matter from secondary effluents

2018 ◽  
Vol 4 (6) ◽  
pp. 773-782 ◽  
Author(s):  
Dayang Wang ◽  
Lirong Cheng ◽  
Mingming Wang ◽  
Xuezhen Zhang ◽  
Dong Xue ◽  
...  
Keyword(s):  
Organic Matter ◽  
Transition Metal ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Sulfate Radical ◽  
Oxidation Processes ◽  
Secondary Effluents ◽  
Energy Activation

The effects of sulfate radical-mediated advanced oxidation processes with transition metal and energy activation methods were investigated during effluent organic matter (EfOM) degradation.

Advanced oxidation processes: flowsheet options for bulk natural organic matter removal

2004 ◽  
Vol 4 (4) ◽  
pp. 113-119 ◽  
Author(s):  
C.A. Murray ◽  
S.A. Parsons
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Natural Organic Matter ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Oxidation Processes

Advanced oxidation processes have been reported to have the potential to remove natural organic matter from source waters. Of these Fenton's reagent, photo-Fenton's reagent and titanium dioxide photocatalysis are the three most promising processes. Compared to conventional coagulation/flocculation processes they have higher removal efficiencies in terms of both dissolved organic carbon and UV254 absorbance. Under optimum reaction conditions all three remove over 80% dissolved organic carbon and 0% UV254 absorbance. In addition the enhanced removal of natural organic matter leads to a corresponding reduction in the formation of disinfection by-products following chlorination of the treated water. Advanced oxidation processes give enhanced removal of organic species ranging from low to high molecular weight while coagulation/flocculation is inefficient at removing low molecular weight species. One additional benefit is all three processes produce less residuals compared to conventional coagulation, which is advantageous as the disposal of such residuals normally contributes a large proportion of the costs at water treatment works.

UV Based Advanced Oxidation Process for Degradation of Ciprofloxacin: Reaction Kinetics, Effects of Interfering Substances and Degradation Product Identification

2021 ◽  
Author(s):  
Bijoli Mondal ◽  
Shib Sankar Basak ◽  
Arnab Das ◽  
Sananda Sarkar ◽  
Asok Adak
Keyword(s):  
Organic Compounds ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Uv Light ◽  
Degradation Products ◽  
Irradiation Time ◽  
Advanced Oxidation ◽  
Quantum Yields ◽  
Photon Flux ◽  
First Order

Abstract In the photochemical UV-H2O2 advanced oxidation process, H2O2 absorbs UV light and is decomposed to form hydroxyl radicals (OH·), which are highly excited and reactive for electron-rich organic compounds and hence can degrade organic compounds. In the present work, the UV-H2O2 process was investigated to degrade ciprofloxacin (CIP), one of India's widely used antibiotics, from aqueous solutions using a batch type UV reactor having photon flux = 1.9 (± 0.1) ×10-4 Einstein L-1 min-1. The effects of UV irradiation time on CIP degradation were investigated for both UV and UV-H2O2 processes. It was found that about 75% degradation of CIP was achieved within 60 s with initial CIP concentration and peroxide concentration of 10 mg L-1 and 1 mol H2O2/ mol CIP, respectively, at pH of 7(±0.1) and fluence dose of 113 mJ cm-2. The experimental data were analyzed by the first-order kinetics model to find out the time- and fluence-based degradation rate constants. Under optimized experimental conditions (initial CIP concentration, pH and H2O2 dose of 10 mg L-1, 7(±0.1) and 1.0 mol H2O2 / mol CIP, respectively), the fluence-based pseudo-first-order rate constant for the UV and UV-H2O2 processes were determined to be 1.28(±0.0) ×10-4 and 1.20(±0.04) ×10-2 cm2 mJ-1 respectively. The quantum yields at various pH under direct UV were calculated. The impacts of different process parameters such as H2O2 concentration, solution pH, initial CIP concentration, and wastewater matrix on CIP degradation were also investigated in detail. CIP degradation was favorable in acidic conditions. Six degradation products of CIP were identified. Results clearly showed the potentiality of the UV-H2O2 process for the degradation of antibiotics in wastewater.

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