Exploring the advanced oxidation/reduction processes in the VUV photoreactor for dechlorination and mineralization of trichloroacetic acid: Parametric experiments, degradation pathway and bioassessment

Moussavi, Gholamreza; Rezaei, Mohsen

doi:10.1016/j.cej.2017.07.006

Cited by 69 publications

(15 citation statements)

References 37 publications

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“…•-, which is consistent with the results of previous reports (12). In the other study conducted by Sharma et al on the degradation of bisphenol A (BPA) by UVC/PMS, it is reported that an increase in the concentration constant of BPA, yields a greater number of BPA molecules to oxidize free radicals, therefore, the reaction rate increases.…”

Section: -supporting

confidence: 91%

“…(9) and (10), and when pH is higher than 7, two reasons for this increase can be considered: The first reason can be attributed to the fact that, when pH is higher than 7, according to Eq. (11) and (12), with increasing S 2 O 8 2concentration, the activity of persulfate is increased and consequently, it produces more SO 4 radicals (11). According to Eq.…”

Section: Discussionmentioning

confidence: 99%

“…The injection rate of this pump was set to be 1 L/min for all experiments. The effect of pH (3)(4)(5)(6)(7)(8)(9)(10)(11)(12), initial concentration of formaldehyde (200-500 mg/L), reaction time, mineralization rate, water anion, and scavengers were evaluated in this study. Also, the effects of common water anions including sulfate, nitrate, chloride, carbonate, bicarbonate, and phosphate were assessed.…”

Section: Experiments Settingsmentioning

confidence: 99%

“…Generated radicals such as hydroxyl and sulfate have been numerously used to control the contamination of drinking water and wastewater treatment due to their rapid reaction, easy application, and high reactivity (11). Nowadays, sulfate radical-based advanced oxidation processes (SR-AOPs) have been considered as a new and effective solution for the decomposition of organic compounds in drinking water (12). In general, SO 4…”

Section: Introductionmentioning

confidence: 99%

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Advanced oxidation of formaldehyde in the aqueous solutions using UVC/S2 O8 2- process: Degradation and mineralization

Tymoyrimoghadam

Momeninejad

Baratpour

et al. 2019

Environ Health Eng Manag

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Background: As a human carcinogen, formaldehyde is a toxic chemical imposing adverse effects on public health and environment. Due to its high reactivity, colorless nature, sustainability, purity in commercial forms, and low prices, the production and consumption of this compound has expanded vastly in industries. Methods: In this study, a UVC photoreactor with a total volume of 120 mL was used and operated in a rotary mode. To determine the residual concentration, high-performance liquid chromatography (HPLC) device was applied whose detector was set at a wavelength of 355 nm and equipped with C18 column (with dimensions of 25 × 4.6 mm i.d, and particle size of 5 µm). Total organic carbon (TOC) was determined using a TOC analyzer. Results: The optimal condition in this study was obtained at pH=3 and formaldehyde concentration of 350 mg, so that the removal of formaldehyde and TOC was 98.2% and 95.1%, respectively, after 35 minutes reaction time. The formaldehyde removal efficiency was assessed in the presence of methanol (MeOH), tert-butyl alcohol (TBA), and salicylic acid (SA) scavengers, and it was indicated that SO4 •- radicals were the most effective factors in formaldehyde destruction. By increasing the concentrations of MeOH, TBA, and SA to 2.5 g/L, the degradation efficiency of formaldehyde dropped from 98.02% to 69.78%, 64.68%, and 45.14%, respectively, at 35 minutes reaction time. The removal of formaldehyde in the presence of nitrate was significantly reduced and it had a significant effect on the removal of formaldehyde. Conclusion: In this study, the removal of formaldehyde was investigated in the presence of various anions including bicarbonate, carbonate, chloride, sulfate, and nitrate. According to the results, the UVC/S2 O8 2- process is a convenient and cost-effective method for the removal of formaldehyde.

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Section: -supporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Experiments Settingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Advanced oxidation of formaldehyde in the aqueous solutions using UVC/S2 O8 2- process: Degradation and mineralization

Tymoyrimoghadam

Momeninejad

Baratpour

et al. 2019

Environ Health Eng Manag

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“…Electrochemical pretreatment can be applied to improve the effluent biodegradability and/or decrease the toxicity of the organic pollutants [90]. Furthermore, the combination of electrochemical reduction and oxidation has resolved this problem and improve the removal efficiency in the treatment of halogenated organics [8,91].…”

Section: Coupled or Combined Electrochemical Processesmentioning

confidence: 99%

A Review on Electrochemical Degradation and Biopolymer Adsorption Treatments for Toxic Compounds in Pharmaceutical Effluents

et al. 2020

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Pharmaceutical industries generate very large quantities of toxic organic compounds which include volatile organic compounds (VOCs) and/or organic volatile impurities (OVIs). These toxic compounds, amongst which are emerging residual solvents, largely come from wastewater treatment plants (WWTPs) and are being continuously dumped into the environment at an alarming rate. Efficient treatment of pharmaceutical wastewaters (effluents) is currently a major challenge because of not only the enormous quantity to be disposed of but also its complexity, as well as its hazardous nature. Dumping these kinds of polluted wastes into the environment at uncontrolled rates are putting increasing pressure on freshwater ecosystems. This review paper focuses on combined electrochemical degradation and biopolymer adsorption treatment processes and techniques for toxic compounds in pharmaceutical wastewater treatment. These emerging processes such as the combination of electrochemical techniques as a primary treatment method, followed by an adsorption process, is now a topic of intense research as it is proving to very feasible, ecofriendly, and cost-effective in the complete recovery of toxic residual solvents from binary aquatic systems. This paper presents major toxic pollutants in pharmaceutical wastewaters and their fate in the aquatic environment, their sources, and origin in pharmaceutical industries. The evaluation of the traditional methods used for the removal of these emerging organic pollutants from aquatic matrices and pharmaceutical effluents is accomplished. New developments in electrochemical treatments for the remediation of toxic compounds in pharmaceutical wastewaters are also discussed.

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Synergistic 2,4-D Degradation by Fenton Reagent Obtained from Glow Discharge Plasma Formed H2O2 and DBD Pretreated Fe-Rich Sludge Catalyst

Huang

Huang²,

Gan

et al. 2022

Plasma Chem Plasma Process

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Exploring the advanced oxidation/reduction processes in the VUV photoreactor for dechlorination and mineralization of trichloroacetic acid: Parametric experiments, degradation pathway and bioassessment

Cited by 69 publications

References 37 publications

Advanced oxidation of formaldehyde in the aqueous solutions using UVC/S2 O8 2- process: Degradation and mineralization

Advanced oxidation of formaldehyde in the aqueous solutions using UVC/S2 O8 2- process: Degradation and mineralization

A Review on Electrochemical Degradation and Biopolymer Adsorption Treatments for Toxic Compounds in Pharmaceutical Effluents

Synergistic 2,4-D Degradation by Fenton Reagent Obtained from Glow Discharge Plasma Formed H2O2 and DBD Pretreated Fe-Rich Sludge Catalyst

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