Measurement of the initial phase of ozone decomposition in water and wastewater by means of a continuous quench-flow system: Application to disinfection and pharmaceutical oxidation

Buffle, Marc-Olivier; Schumacher, Jochen; Salhi, Elisabeth; Jekel, Martin; Gunten, Urs von

doi:10.1016/j.watres.2006.02.026

Cited by 191 publications

(125 citation statements)

References 34 publications

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“…It was discovered that even though the ozone lifetime was short at pH 7.75 and pH 9.00, a removal of the eight model compounds was obtained. This supports the findings by Buffle et al [29] where removal of some pharmaceuticals was calculated based on ozone and hydroxyl radical exposure and the second order rate constants and significant removal could be predicted even when ozone is decomposed within the first 20 sec. At each pH level, the DDO 3 value was determined for each pharmaceutical.…”

Section: Effect Of Ph On Removal Of Pharmaceuticalssupporting

confidence: 91%

“…The investigation of ozone concentration within the first 20 seconds (initial phase) requires specialized equipment as used by Buffle et al [29]. These authors discovered that the ozone decomposition in the initial phase followed higher-order kinetics while the second phase (> 20 sec) followed first order kinetic [29]. Our results also show a first order kinetic for ozone decomposition (Figure 3).…”

Section: Decomposition Of Ozone At Different Phsupporting

confidence: 56%

“…As seen in Figure 3, a rapid decrease in ozone concentration was observed within the first 20 seconds. The investigation of ozone concentration within the first 20 seconds (initial phase) requires specialized equipment as used by Buffle et al [29]. These authors discovered that the ozone decomposition in the initial phase followed higher-order kinetics while the second phase (> 20 sec) followed first order kinetic [29].…”

Section: Decomposition Of Ozone At Different Phmentioning

confidence: 99%

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Ozonation for source treatment of pharmaceuticals in hospital wastewater – Ozone lifetime and required ozone dose

Hansen

Spiliotopoulou²,

Chhetri

et al. 2016

Chemical Engineering Journal

125

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Highlights:  Ozone dosage was determined for pharmaceuticals removal in hospital wastewater  The ozone dosage required varied 2-fold with both DOC and pH experienced over time  DOC normalized ozone dosage for 90% removal of 32 pharmaceuticals was determined  At low pH, pharmaceuticals need less ozone while ozone lifetime increased to 20 min  H 2 O 2 dosing shorten the ozone lifetime at low pH to 5 min similar to neutral pH 2 Abstract: Ozonation aimed at removing pharmaceuticals was studied in an effluent from an experimental pilot system using staged Moving Bed Biofilm Reactor (MBBR) tanks for the optimal biological treatment of wastewater from a medical care unit of Aarhus University Hospital. Dissolved Organic Carbon (DOC) and pH in samples varied considerably, and the effect of these two parameters on ozone lifetime and the efficiency of ozone in removing pharmaceuticals were determined. The pH in the effluent varied from 5.0 to 9.0 resulting in approximately a doubling of the required ozone dose at the highest pH for each pharmaceutical. DOC varied from 6 to 20 mg-DOC/L. The ozone required for removing each pharmaceutical, varied linearly with DOC and thus, ozone doses normalized to DOC (specific ozone dosis) agreed between water samples (typically within 15%). At neutral pH the specific ozone dose required to remove the easiest degradable pharmaceutical, sulfadiazine, was 0.50±0.04 mg-O 3 /mg-DOC and the most recalcitrant, diatrizoic acid, required 4.7±0.6 mg-O 3 /mg-DOC. The lifetime of ozone increased drastically in the higher end of the indicated dosage. At the lowest observed pH of 5.0, its lifetime was quadrupled to 20 min which influences the design of the reaction tank. The addition of 0.1 mg-H 2 O 2 per 1 mg-O 3 mitigated the prolonged lifetime without a corresponding influence in the pharmaceutical removal efficiency of ozone.

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Section: Effect Of Ph On Removal Of Pharmaceuticalssupporting

confidence: 91%

Section: Decomposition Of Ozone At Different Phsupporting

confidence: 56%

Section: Decomposition Of Ozone At Different Phmentioning

confidence: 99%

See 1 more Smart Citation

Ozonation for source treatment of pharmaceuticals in hospital wastewater – Ozone lifetime and required ozone dose

Hansen

Spiliotopoulou²,

Chhetri

et al. 2016

Chemical Engineering Journal

125

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“…Some physical-chemical techniques, such as activated carbon adsorption [2], coagulation [2], fenton reagent [3] and ozone [4] were applied to treat the black-odor water by some researchers. These techniques have some obvious advantages of decoloration and deodorant.…”

Section: Introductionmentioning

confidence: 99%

Construction of Microbial Consortium and Its Directly Treatment for the Black-odor Water

Song¹,

Xiao-ling²,

Song³

2017

dteees

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Abstract.Recently, how to efficiently treat the black-odor water in China has become an urgent issue. In this study, a microbial consortium which consisted of yeast, actinomyce and nitrobacteria isolated from East Sha River located in Beijing was constructed and used to directly treat black-odor water, and the removal efficiency was also investigated. The experimental results showed that the microbial consortium exhibited more significant removal efficiency in comparison with single strains. The mixing proportion of single strains in the microbial consortium was then optimized. It was found that a high removal level of COD, NH 3 -N and TP could be achieved when the mixing proportion of yeast, actinomyce and mitrobactera was set at 1:1:1, and their removal efficiencies arrived at 60.2%, 81.7% and 85.7%, respectively. Furthermore, the optimizing microbial consortium was applied to treat other some black-odor water from Qing River, Qinghe Park and a pharmaceutical manufactory, respectively. With the exception of water sample from the pharmaceutical manufactory, the optimizing microbial consortium showed obvious potentials to treat the black-odor water, especially the water from urban rivers. Removal efficiencies of NH 3 -N, TP and chroma in the water sample from Qing River were above 95%.

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“…Pharmaceuticals have been detected in ground and surface water (3) , drinking water (4) , tap water, ocean water, sediments and soil (5) . Pharmaceuticals end up in soil, surface waters and eventuallyin ground and drinking water after their excretion (in un-metabolizedform or as active metabolites).The sources are: humans or animals via urine or faeces, through the sewage system and into the influent of wastewater treatment plants (2) .…”

mentioning

confidence: 99%

Issue of Pharmaceutical Compounds in Water and Wastewater: Sources, Impact and Elimination

2013

Egypt. J. Chem.

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HARMACEUTICALS are designed to have a physiological effect …..on humans and animals in trace concentrations. Persistence against biological degradation and their biological activity are key properties of these pollutants. Increasing consumption of pharmaceutical active compounds (PhACs) and their discharge to the municipal wastewater via excrete are a growing danger for water quality and thus for the health of citizens.The entire discharge volume of medicines into the sewage net and the inefficiency of suitable wastewater treatment solutions to face such a problem, leads to high pharmaceuticals content in the drinking water. Due to its low degradability, 80% of these substances are raw discharged by excretion and flushed to the toilets and sewers to the sewage plants, where no rejection takes place, thus leading to growth of bacterial resistance. This leads to high pharmaceuticals content in the drinking water, people assimilate these substances, resulting in every time higher difficulties when treating common illnesses.The aim of the present article is to review the issue of PhACs in the environment. The review focuses on the source, presence, fate, elimination, and treatment of PhACs in water and wastewater. This review includes: characteristics, occurrence and pathways of PhACs in water and wastewater, fate in the oriented sanitation, environmental and public health impacts. Furthermore, preventing pharmaceuticals in drinking-water, treatment technologies for their removal, knowledge gaps and future research for pharmaceuticals in drinking-water are also discussed. Advanced oxidation techniques, biological treatment systems, separation and treatment of urine for PhACs removal as effective tools are evaluated.

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Measurement of the initial phase of ozone decomposition in water and wastewater by means of a continuous quench-flow system: Application to disinfection and pharmaceutical oxidation

Cited by 191 publications

References 34 publications

Ozonation for source treatment of pharmaceuticals in hospital wastewater – Ozone lifetime and required ozone dose

Ozonation for source treatment of pharmaceuticals in hospital wastewater – Ozone lifetime and required ozone dose

Construction of Microbial Consortium and Its Directly Treatment for the Black-odor Water

Issue of Pharmaceutical Compounds in Water and Wastewater: Sources, Impact and Elimination

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