Optimization of ozone disinfection and its effect on trihalomethanes

Verma, Kusum; Gupta, Deepika; Gupta, Akhilendra Bhushan

doi:10.1016/j.jece.2016.06.017

Cited by 24 publications

(9 citation statements)

References 39 publications

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“…The COD-lowering efficiency decreased distinctly (from 27.4% to 15.5%) when the applied O 3 dose exceeded 50.0 mg/L. This was due mainly to the fact that the hydroxyl radical was consumed instantaneously by O 3 -demanding species, even though the applied O 3 dose was high [ 24 , 25 , 36 ]. Thus, it can be concluded that the COD-lowering efficiency was improved by increasing the applied O 3 dose to 50.0 mg/L, whereas a further increase from 60.0 mg/L to 90.0 mg/L resulted in decreased efficiency.…”

Section: Resultsmentioning

confidence: 99%

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%

Investigation of Oxidation Methods for Waste Soy Sauce Treatment

Jang

Seo

Jeong

2017

IJERPH

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“…Nan et al [22] reported that ozonation enhanced the yields of all detected chlorine DBPs except CHCL 3 . Verma et al [85] also reported increased amounts of DBP's after ozonation. It should be noted that the increase in DBPs potential depends on the presence of precursor ions such as Br À .…”

Section: Thm Degradation Study and Dbp Reduction Potentialmentioning

confidence: 92%

“…It is known from previous studies that ozonation reduced the formation of THMs when compared to chorination [87]. Verma et al [85] reported that the occurrence of THMs was 61% less compared to chlorination. In the present work, the decrease in THMs formation was 60%.…”

Section: Thm Degradation Study and Dbp Reduction Potentialmentioning

confidence: 99%

Humic acid and trihalomethane breakdown with potential by-product formations for atmospheric air plasma water treatment

Sarangapani¹,

Lü²,

Behan³

et al. 2018

Journal of Industrial and Engineering Chemistry

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A B S T R A C TIn this study an atmospheric air plasma reactor was studied for the degradation of HA and THMs in water. Plasma treatment showed significant breakdown efficacies for HA and THMs. At an applied voltage of 80 kV about 93% of HA and >70% of THMs were degraded after 15 min and 30 min treatment time respectively, with the degradation following a first order kinetic model. Plasma induced reactive species including nitrates and H 2 O 2 were quantified in the treated water. The results of FTIR analysis revealed that the molecular structure of HA was altered by the plasma treatment, with a decrease in aromaticity observed.

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“…Activation of PMS and PS via these materials can occur through 3 different pathways: (a) radical generation (Equations (10) and (11)), (b) non-radical pathway, involving the formation of charge transfer complex, generation of singlet oxygen, and/or direct catalysis or (c) combination of both [94]. In addition, these materials usually have a strong adsorption capacity, so it is common for them to be able to eliminate a fraction of the contaminants by itself [99][100][101].…”

Section: Carbon-based Catalystsmentioning

confidence: 99%

“…Many THMs have been identified as genotoxic mutagens that can be toxic to aquatic life, and even to humans, some of them being considered as carcinogenic [8,9]. For this reason, during the last decades, the scientific community has focused on the search for disinfection alternatives [10,11]. Among them are the advanced oxidation processes (AOPs) [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Sulfate Radical-Based Advanced Oxidation Processes for Water and Wastewater Treatment: A Review

Guerra-Rodríguez

Rodríguez

Singh

et al. 2018

Water

239

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High oxidation potential as well as other advantages over other tertiary wastewater treatments have led in recent years to a focus on the development of advanced oxidation processes based on sulfate radicals (SR-AOPs). These radicals can be generated from peroxymonosulfate (PMS) and persulfate (PS) through various activation methods such as catalytic, radiation or thermal activation. This review manuscript aims to provide a state-of-the-art overview of the different methods for PS and PMS activaton, as well as the different applications of this technology in the field of water and wastewater treatment. Although its most widespread application is the elimination of micropollutants, its use for the disinfection of wastewater is gaining increasing interest. In addition, the possibility of combining this technology with ultrafiltration membranes to improve the water quality and lifespan of the membranes has also been discussed. Finally, a brief economic analysis of this technology has been undertaken and the different attempts made to implement it at full-scale have been summarized. As a result, this review tries to be useful for all those people working in that area.

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Optimization of ozone disinfection and its effect on trihalomethanes

Cited by 24 publications

References 39 publications

Investigation of Oxidation Methods for Waste Soy Sauce Treatment

Investigation of Oxidation Methods for Waste Soy Sauce Treatment

Humic acid and trihalomethane breakdown with potential by-product formations for atmospheric air plasma water treatment

Assessment of Sulfate Radical-Based Advanced Oxidation Processes for Water and Wastewater Treatment: A Review

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