Using DOM fraction method to investigate the mechanism of catalytic ozonation for real wastewater

Sun, Xiaohong; Wu, Changyong; Zhou, Yuexi; Han, Wei

doi:10.1016/j.cej.2019.03.074

Cited by 43 publications

(12 citation statements)

References 59 publications

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“…In catalytic reactions, ozone molecules repeatedly react with the regenerated natural catalysts present in the soil. In other words, finite reactions will reach completion after oxidation of all consumers, , while catalytic reactions proceed through regeneration of the catalyst. Catalytic reactions often involve the formation of reactive oxygen species (ROS) and indirect oxidation of soil components. ,, As in situ remediation is generally a long-lasting process, distinguishing between catalytic and finite consumption of ozone is necessary for the design and implementation of the application.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ozone Consumption by Soils: A Critical Factor in In Situ Ozonation Processes

et al. 2021

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In situ chemical ozonation (ISCO 3 ), in which gaseous ozone is being injected into the subsurface, is a common method for remediating contaminated groundwater that is largely affected by the inevitable consumption of ozone by soil itself (rather than the target contaminants). In this study, ozone consumption by two main soil types of Israeli coastline aquifer was examined. Iron-rich soil showed considerably higher reactivity than did calcareous soil. We further investigated the effect of both physical and chemical soil characteristics on finite and catalytic ozone decay, hydroxyl-radical formation, and ozone transport behavior. Ozone consumption increased by >90% in the presence of fine soil particles (<100 μm), resulting from the large number of reactive sites and the higher content of ozone consumers compared to coarse soil particles. Soil organic matter consumed ozone twice as fast as iron components, promoted radical formation at higher rates, and mainly acted as a finite ozone consumer. In continuously fed column experiments, the reactions with iron components dominate catalytic ozone consumption during transport in porous media. Overall, this study demonstrates that the characterization of ozone reactions in soil can be helpful in evaluating the feasibility and efficiency of ISCO 3 and inform the design of ISCO 3 treatment, e.g., the need to inject additional radical promoters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ozone Consumption by Soils: A Critical Factor in In Situ Ozonation Processes

et al. 2021

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“…Synthetic dyes are extensively used in various fields such as textile, printing, and decoration [1]. Due to its toxicity, stability, high chroma, and high concentration, synthetic dyes detrimentally affect aquatic lives and human beings [2]. Studies have proven that textile wastewater can reduce the level of dissolved oxygen and inhibit the reproduction of aquatic organisms if it enters a water body [3,4].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies

Lin

et al. 2020

Journal of Chemistry

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Waste black tea powder was used as a potential adsorbent to remove methylene blue (MB) from aqueous solution. Several operating factors in adsorption of MB onto waste black tea powder were investigated, including contact time, initial MB concentration, solution pH, adsorption temperature, and dosage of waste black tea powder. Experimental results revealed that the adsorption efficiency increased with contact time and solution pH values and decreased with initial MB concentration and adsorption temperature. The equilibrium time was estimated to be around 60 min. The maximum adsorption capacity and the highest adsorption efficiency were 302.63 mg·g−1 and 100%, respectively. In kinetic study, pseudo-first-order and pseudo-second-order kinetic models, intraparticle diffusion model, and Boyd and Elovich models were employed to analyze the adsorption behavior and the adsorption mechanism. It was found that the pseudo-second-order kinetic model was suitable to describe the adsorption process, and the calculated equilibrium adsorption capacity was well close to the experimental data for different initial MB concentrations. The internal diffusion was not the only rate-controlling step, and the existence of boundary effect was observed in this study. From isotherm analysis, the equilibrium data were well represented by the Langmuir model, rather than Freundlich, Dubinin–Redushckevich, or Temkin models. The nonlinear fitting for various isotherm models implied that the adsorption behavior between MB and waste black tea powder was complication. Thermodynamic parameters including changes in Gibb’s free energy, enthalpy, and entropy suggested that adsorption of MB onto waste black tea powder was a spontaneous and exothermic process. The multiple regeneration/adsorption experiments indicated that the used black tea powder efficiently remained more than 75% after five cycles using NaOH as a regenerative reagent and thus be used for many times. Therefore, as a low-cost and easily available material, waste black tea powder could be applied in wastewater treatment.

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“…26,50,51 The non-fluctuation of UV 254 in the medium-MW range of 3-10 K is caused by the balance between the conversion of aromatic macromolecules to small molecules and the mineralization of small molecules. 52 Based on the above analysis, the MW distribution is closely related to the composition and treatment process of the wastewater. The CF-PS process has more advantages for the degradation of high-MW colloids, mainly because of the combination of the selectivity of CF toward high-MW organics and the strong oxidation of PS.…”

Section: Environmental Science: Water Research and Technology Papermentioning

confidence: 99%

Potential for colloid removal from petrochemical secondary effluent by coagulation–flocculation coupled with persulfate process

Zhao

Liu

et al. 2022

Environ. Sci.: Water Res. Technol.

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Using DOM fraction method to investigate the mechanism of catalytic ozonation for real wastewater

Cited by 43 publications

References 59 publications

Ozone Consumption by Soils: A Critical Factor in In Situ Ozonation Processes

Ozone Consumption by Soils: A Critical Factor in In Situ Ozonation Processes

Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies

Potential for colloid removal from petrochemical secondary effluent by coagulation–flocculation coupled with persulfate process

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