Inactivation characteristics of ozone and electrolysis process for ballast water treatment using B. subtilis spores as a probe

Jung, Youmi; Yoon, Yong Jin; Hong, Eunkyung; Kwon, Minhwan; Kang, Joon Wun

doi:10.1016/j.marpolbul.2013.04.028

Cited by 26 publications

(7 citation statements)

References 25 publications

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“…From Equations (11)- (16), the apparent second-order rate constant k app for FF and OA, considering the equilibrium of the dissociation reactions of FF and OA, is derived, as given by Equation 18 . The species-specific rate constants were determined by a nonlinear least-squares regression of the experimental value of the apparent rate constant at each pH for the bromination process.…”

Section: Determination Of Bromine Rate Constants For the Selected Antmentioning

confidence: 99%

“…Seawater ozonation can protect the aquatic ecosystem from harmful organic substances. The ozone chemistry of seawater is considerably different from that of fresh water because seawater contains a much higher concentration of dissolved anions and cations (e.g., chloride, bromide, magnesium, sulfate), than fresh water [15,16]. Particularly, the bromide ion is a key ion for ozonation because of its high reactivity towards ozone.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation of Florfenicol and Oxolinic Acid in Seawater by Ozonation

Kye

Jung

et al. 2020

Applied Sciences

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There has been an increase in the use of antibiotics by the aquaculture industry in marine aquaculture for the prevention of diseases in fish. Antibiotics in the water discharged into the sea without treatment can cause disturbances to the marine ecosystem. Therefore, there is a need for research on how the removal of antibiotics used in aquaculture can be achieved. In this study, the removal of two types of antibiotics (florfenicol, FF, and oxolinic acid, OA) used in the aquaculture industry, by ozonation, was evaluated. Currently, there is a lack of research studies on FF and OA removal from seawater by ozonation. Seawater ozonation shows a significantly different oxidation mechanism as compared to that of freshwater. The high amount of Br− in seawater (60 mg/L) allows for a rapid reaction with ozone to produce bromine (HOBr/OBr−) at a rate of 160 M−1s−1. To predict the removal efficiency of antibiotics by ozone and bromine, the species-specific rate constants for the reaction of FF and OA with ozone and bromine were determined. The predicted removal efficiencies of FF and OA using measured rate constants were verified by the ozonation process in water containing bromide ions in similar concentrations as in seawater. The result for FF indicated less than 10% removal during 20 min, with the rate constants of FF with ozone and bromine being 3.2 M−1s−1 and 3.5 M−1s−1, respectively. However, the removal of OA using ozonation was approximately 99% or higher within 90 s. In the presence of bromide ions, approximately 60% of OA was removed by trace ozone within 15 s, and approximately 30% of OA was removed by the generated bromine after 15 s. Comparing the removability of FF and OA used in aquaculture by ozone, it was observed that FF was more difficult to remove because of its low reaction rate constant. Meanwhile, the reaction rates of OA with ozone and bromine were 2.4 × 103 M−1s−1 and 4.0 × 102 M−1s−1, respectively. At the beginning of the reaction, OA was removed by the trace ozone. Subsequently, OA was removed by the generated bromine after the ozone was decomposed.

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Section: Determination Of Bromine Rate Constants For the Selected Antmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxidation of Florfenicol and Oxolinic Acid in Seawater by Ozonation

Kye

Jung

et al. 2020

Applied Sciences

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“…In fact, the main active oxidants in seawater electrolysis are bromine and chlorine. Due to their similar chemical characteristics, it is difficult to individually isolate bromine and chlorine [14]. Therefore, the term TRO is used frequently to refer to residual chlorine and bromine without distinction in seawater electrolysis.…”

Section: Tro Formation Mechanismmentioning

confidence: 99%

“…In our previous study [14], the main TRO component was estimated based on the chemical reactions (2)- (11). From reactions (2)-(9) in (Table 2), the bromine and chlorine are produced by electrolysis in seawater at the same time.…”

Section: Tro Formation Mechanismmentioning

confidence: 99%

Evaluation of energy consumption for effective seawater electrolysis based on the electrodes and salinity

Jung

Yoon

Kwon

et al. 2016

Desalination and Water Treatment

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2015): Evaluation of energy consumption for effective seawater electrolysis based on the electrodes and salinity, Desalination and Water Treatment, A B S T R A C TThis study recommended the effective condition in electrolysis of saline water considering the energy consumption. The experiments were performed using two types of electrodes, IrO 2 /Ti and Pt/Ti, under various salinity conditions (4, 8, 16, 32, and 46 PSU) and current density conditions (11, 33, 55, 111, and 222 mA/cm 2 ). The electrolysis produced mainly bromine, which was measured as a total residual oxidant (TRO). Seawater electrolysis produced TRO linearly with increasing the run time and current density. Below 32 PSU, the electrolysis using the IrO 2 /Ti electrode produced the TRO greater than that using the Pt/Ti electrode. The TRO formation rate of the IrO 2 /Ti electrode increased following a half parabola pattern in terms of salinity, while that of the Pt/Ti electrode increased until 32 PSU, and then it decreased to 46 PSU. The measured electric power of both electrodes showed the same graph tendency with a parabolic curve as a quadratic equation. The energy consumption of the IrO 2 /Ti and Pt/Ti electrodes showed a quite different tendency. Considering the energy consumption as well as the required time for TRO formation, the same range of current density (30-50 mA/cm 2 ) is recommended for the two electrodes, IrO 2 /Ti and Pt/Ti electrodes, even in a different tendency of energy consumption.

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“…However, authors concluded that main inactivation mechanisms involve also mechanical stress and direct oxidation on the surface of the diamond electrode. Jung et al[141] used a hybrid process combining ozonation and electrolysis for ballast water treatment. They concluded that ozone-electrolysis hybrid process can be considered as a complementary process which might overcome the limitations of individual processes in terms of lag and tailing phase.…”

mentioning

confidence: 99%