Performance characterization and kinetic modeling of ozonation using a new method: ROH,O3 concept

Kwon, Minhwan; Kye, Homin; Jung, Youmi; Yoon, Yong Jin; Kang, Joon Wun

doi:10.1016/j.watres.2017.05.062

Cited by 40 publications

(26 citation statements)

References 31 publications

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“…As a result, the color-removal efficiency decreased in the following order: 81.1% (O 3 ) > 46.5% (Fe 2+ ) > 38.9% (Fe 3+ ). It is well known that the oxidant O 3 is highly capable of oxidation from the hydroxyl radical [ 24 , 25 , 26 ]. Among the examined oxidation methods, O 3 oxidation can be selected as the most promising treatment method for waste soy sauce on the basis of its relatively high color-removal efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…The color-removal efficiency at pH 11.0 was the highest value, mainly because of an increased amount of hydroxyl radical [ 27 ]. Above pH 11.0, the color-removal efficiency clearly decreased (from 17.5% to 11.1%), mainly because oxidation above pH 11.0 has a strong scavenging effect of carbonate (CO 3 2− ) and bicarbonate (HCO 3− ), resulting in lower color-removal efficiency [ 13 , 16 , 24 ]. This result shows clearly that the color-removal efficiency depends strongly on the pH of the oxidation method [ 25 , 26 ].…”

Section: Resultsmentioning

confidence: 99%

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Investigation of Oxidation Methods for Waste Soy Sauce Treatment

Jang

Seo

Jeong

2017

IJERPH

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To obtain a suitable oxidation method for removing the color and lowering the chemical oxygen demand (COD) of waste soy sauce, Fenton (Fe2+), Fenton-like (Fe3+), and ozone (O3) oxidation methods are used as the target reactions. In experimental conditions for Fenton oxidation, the dose of Fe2+ and Fe3+ was varied between 100 mg/L and 300 mg/L. The dose of hydrogen peroxide for the reaction was injected from 100–1000 mg/L. For ozone oxidation, the pH was increased from 3 to 14 and the O3-containing gas was supplied continuously for 30 min through a gas diffuser at the bottom of the reactor at different applied O3 doses (10–90 mg/L). We subjected it to a simple 1:20 dilution with deionized water to identify the comparison result in detail. O3 oxidation shows the highest efficiencies of color removal (81.1%) and COD lowering (64.9%) among the three oxidation methods. This is mainly due to the fact that it has a relatively large amount of hydroxyl radical, resulting in the degradation of organics. Thus, O3 oxidation could be a promising method for removing the color and lowering the COD of waste soy sauce. The critical parameters (pH and applied O3 dose) were varied systematically to optimize O3 oxidation. It was found that the optimum pH and applied O3 dose are 11.0 mg /L and 50.0 mg /L, respectively (color removal = 34.2%, COD removal = 27.4%).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Investigation of Oxidation Methods for Waste Soy Sauce Treatment

Jang

Seo

Jeong

2017

IJERPH

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“…SAC 254 values (Table 3) were found to be decreasing as shown: VO 3 -AL (11.1%), VO 3 -AT (16.7%), VO 3 -01 (13.4%), VO 3 -02 (31.7%) and VO 3 -03 (19.4%). This tendency makes evident the presence of aromatic organic components since it has been reported that O 3 reacts directly with them [49][50][51]. Besides manifesting the reduction of the aromatic fraction of OM, SAC 254 reduction also revealed the decrease of the unsaturated molecules.…”

Section: Ozone Effect Over Organic Matter (Sac 254 Cod and Bod 5 )mentioning

confidence: 72%

“…This is probably driven by the rapid reaction between O 3 and OH − (Equation (5)). The rise in concentration of DO is said to be an indicator of the occurrence of indirect oxidation mechanisms on which oxygen is generated [1,51,69]. In addition, the increase of DO may be related to the injection of oxygen-laden gas during ozonation, since, when ozone is generated from dry air, almost 20% of the total gas corresponds to oxygen [75].…”

Section: Dissolved Oxygen (Do) and Redox-potential (Orp)mentioning

confidence: 99%

Treatment of Eutrophic Water and Wastewater from Valsequillo Reservoir, Puebla, Mexico by Means of Ozonation: A Multiparameter Approach

Tabla-Hernandez

Rodríguez-Espinosa

Hernández‐Ramírez

et al. 2018

Water

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The present work aims to elucidate the possibility of injecting ozone into surface waters combined with urban wastewaters in order to improve the water quality of the High Atoyac Sub-basin (HAS) in Central Mexico. For this purpose, twenty physicochemical parameters, eight heavy metals, seven organic compounds, and one biological indicator were assessed in water from different sites of the studied area (the Alseseca River, the Atoyac River and the Valsequillo Reservoir). Results demonstrated that O3 injection led to the decrease of the aromatic fraction of organic molecules since the Spectral Absorption Coefficient at 254 nanometers (SAC254) reduction was found to be 31.7% in the Valsequillo Reservoir water samples. Maximum Chemical Oxygen Demand (COD) removal was observed to be 60.2% from the Alseseca River with a 0.26 mg O3/mg initial COD dose. Among all the phthalates studied in the present work, Di(2-ethylhexyl) phthalate (DEHP) exhibited the highest concentration (5.8 μg/L in the Atoyac River). Treatment with O3 was not effective in eliminating fecal coliforms (FC) in waters that host high organic matter (OM) loads as opposed to waters with low OM. After the injection of 4.7 mg O3/mg COD in the VO3-AT water sample, a 90% removal of Iron (Fe) and Aluminum (Al) was registered; while Manganese (Mn), Nickel (Ni), Zinc (Zn), and Cooper (Cu) showed a 73%, 67%, 81%, and 80% removal, respectively; Chromium (Cr) registered the highest removal (~100%). The present work demonstrated that while finding a suitable O3 dose to improve the quality of water in the HAS, the 5-days Biochemical Oxygen Demand (BOD5)/COD ratio (i.e., biodegradability) is more important than the overall OM removal percentage proving that O3 injection is a feasible process for the treatment of eutrophic waters from HAS.

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“…The COD reduction effect decreased distinctly from 33.8 to 16.6% as the H 2 O 2 /O 3 ratio increased above 0.3 as observed with the color removal. This was likely due to the OH radicals being consumed by the excessive amounts of H 2 O 2 [27][28][29].…”

Section: Optimization Of H2o2/o3 Ratiomentioning

confidence: 99%

Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce

2018

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Currently, the ozone (O3) oxidation efficiency in the treatment of waste soy sauce provides 34.2% color removal and a 27.4% reduction in its chemical oxygen demand (COD). To improve the O3 oxidation efficiency, hydrogen peroxide (H2O2) is used to cause a H2O2/O3 process. In H2O2/O3 process experiments, a previously optimized pH of 11 and applied O3 dose of 50 mg L−1 were used and the H2O2/O3 ratio was varied between 0.1 and 0.9 in intervals of 0.2. The results show that an H2O2/O3 ratio of 0.3 results in the highest efficiencies in terms of color removal (51.6%) and COD reduction (33.8%). Nanofiltration (NF) was used to pretreat the waste soy sauce to improve color removal and COD reduction. The results showed that NF with an NE-70 membrane results in 80.8% color removal and 79.6% COD reduction. Finally, the combination of NF and H2O2/O3 process resulted in the best treatment efficiency: 98.1% color removal and 98.2% COD reduction. Thus, NF & H2O2/O3 process can be considered as one of the best treatment methods for waste soy sauce, which requires high intrinsic color removal and COD reduction efficiencies.

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Performance characterization and kinetic modeling of ozonation using a new method: ROH,O3 concept

Cited by 40 publications

References 31 publications

Investigation of Oxidation Methods for Waste Soy Sauce Treatment

Investigation of Oxidation Methods for Waste Soy Sauce Treatment

Treatment of Eutrophic Water and Wastewater from Valsequillo Reservoir, Puebla, Mexico by Means of Ozonation: A Multiparameter Approach

Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce

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