Oxidative degradation of sulfamethoxazole from secondary treated effluent by ferrate(VI): kinetics, by-products, degradation pathway and toxicity assessment

2022 ◽  
Author(s):  
Behjat Jebalbarezi ◽  
Reza Dehghanzadeh ◽  
Samira Sheikhi ◽  
Najmeh Shahmahdi ◽  
Hassan Aslani ◽  
...  
Keyword(s):  
Oxidative Degradation ◽  
Degradation Pathway ◽  
Toxicity Assessment ◽  
Treated Effluent ◽  
By Products

scholarly journals Transformation of Contaminants of Emerging Concern (CECs) during UV-Catalyzed Processes Assisted by Chlorine

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1432
Author(s):  
Edyta Kudlek
Keyword(s):  
Hydrogen Peroxide ◽  
Water Samples ◽  
Water Environment ◽  
Toxicity Assessment ◽  
Contaminants Of Emerging Concern ◽  
Post Processing ◽  
Processing Water ◽  
Living Organisms ◽  
Trace Concentrations ◽  
By Products

Every compound that potentially can be harmful to the environment is called a Contaminant of Emerging Concern (CEC). Compounds classified as CECs may undergo different transformations, especially in the water environment. The intermediates formed in this way are considered to be toxic against living organisms even in trace concentrations. We attempted to identify the intermediates formed during single chlorination and UV-catalyzed processes supported by the action of chlorine and hydrogen peroxide or ozone of selected contaminants of emerging concern. The analysis of post-processing water samples containing benzocaine indicated the formation of seven compound intermediates, while ibuprofen, acridine and β-estradiol samples contained 5, 5, and 3 compound decomposition by-products, respectively. The number and also the concentration of the intermediates decreased with the time of UV irradiation. The toxicity assessment indicated that the UV-catalyzed processes lead to decreased toxicity nature of post-processed water solutions.

scholarly journals Oxidative degradation of gentamicin present in water by an electro-Fenton process and biodegradability improvement

2019 ◽  
Vol 17 (1) ◽  
pp. 1017-1025
Author(s):  
Mohamed Réda Arhoutane ◽  
Muna Shueai Yahya ◽  
Miloud El Karbane ◽  
Kacem El Kacemi
Keyword(s):  
Chemical Oxygen Demand ◽  
Biological Process ◽  
Oxidative Degradation ◽  
Oxygen Demand ◽  
Polluted Water ◽  
Applied Current ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Appropriate Treatment ◽  
By Products

AbstractIn the context of environmental protection, where there is a need to develop effective operations for carrying out appropriate treatment of polluted water by pharmaceuticals. Therefore, the present study aims at evaluating the degradation for gentamicin through electro-Fenton (EF) operation, through taking into consideration the effect of several parameters of experimental in the process, namely, the concentration of initial gentamicin, the applied current and the Fe+2 (II) quantities. The (EF) operation employed involves a carbon-felt as cathode and platinum as anode at pH 3. Studies for the gentamicin kinetics is monitored by HPLC giving a pseudo-first order reaction following by a chemical oxygen demand, with a reached degree of mineralization 96% after of four hours of treatment through current 100 mA/cm2 with 0.1 mM of Fe+2. We find that the degradation for molecule of gentamicin is accompanied by an augmentation of the biodegradability, assesse through the Biochemical Oxygen Demand (BOD5) on chemical oxygen demand (COD) ratio, that augmentation from 0 to 0.41 before treatment after 30 min for EF treatment, showing that there is potential for conjugation of the EF process and the biological process. Furthermore, the by-products have been identified on the basis of HPLC-MS/MS results.

LC-MS-(MS) determination of oxidative degradation products of nonylphenol ethoxylates, carboxylates and nonylphenols in water

2004 ◽  
Vol 50 (5) ◽  
pp. 227-234 ◽  
Author(s):  
M. Petrovic ◽  
P. Gehringer ◽  
H. Eschweiler ◽  
D. Barceló
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Limit Of Detection ◽  
Degradation Products ◽  
Oxidative Degradation ◽  
Nonylphenol Ethoxylates ◽  
Beam Irradiation ◽  
Treatment Processes ◽  
By Products

A commercial blend of nonylphenol ethoxylates (NPEOs) was chosen as representative for non-ionic polyethoxylated surfactants to study the oxidative degradation of this class of surfactants in water using ozonation as well as electron beam irradiation with and without the addition of ozone as treatment processes. The electron beam irradiation processes applied represent so-called Advanced Oxidation Processes (AOPs); the combined ozone/electron beam irradiation is, moreover, the most powerful AOP which can be applied in aqueous systems. It was found that both ozonation and the two AOPs applied were able to decompose not only the NPEOs but also the polyethyleneglycoles (PEGs) formed as by-products from NPEO degradation to residual concentrations below the limit of detection. Moreover, the treatment processes were also used to study the oxidative degradation of nonylphenoxy acetic acid (NPEC) and of nonylphenol (NP) which are formed as by-products from biodegradation of NPEOs.

Photodegradation of (E)- and (Z)-Endoxifen in water by ultraviolet light: Efficiency, kinetics, by-products, and toxicity assessment

2020 ◽  
Vol 171 ◽  
pp. 115451
Author(s):  
Marina Ariño Martin ◽  
Jayaraman Sivaguru ◽  
John McEvoy ◽  
Prinpida Sonthiphand ◽  
Andre Delorme ◽  
...  
Keyword(s):  
Ultraviolet Light ◽  
Toxicity Assessment ◽  
By Products ◽  
Light Efficiency

Fungal biodegradation and multi-level toxicity assessment of vinasse from distillation of winemaking by-products

Chemosphere ◽  
2020 ◽  
Vol 238 ◽  
pp. 124572 ◽  
Author(s):  
Joana M.C. Fernandes ◽  
Rose Marie O.F. Sousa ◽  
Irene Fraga ◽  
Ana Sampaio ◽  
Carla Amaral ◽  
...  
Keyword(s):  
Toxicity Assessment ◽  
Multi Level ◽  
Fungal Biodegradation ◽  
By Products

scholarly journals Toxicity Reduction of Industrial and Municipal Wastewater by Advanced Oxidation Processes (Photo-Fenton, UVC/H2O2, Electro-Fenton and Galvanic Fenton): A Review

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 612 ◽  
Author(s):  
Juan José Rueda-Márquez ◽  
Irina Levchuk ◽  
Manuel Manzano ◽  
Mika Sillanpää
Keyword(s):  
Cost Estimation ◽  
Advanced Oxidation Processes ◽  
Municipal Wastewater ◽  
High Efficiency ◽  
Advanced Oxidation ◽  
Toxicity Assessment ◽  
Operational Conditions ◽  
Oxidation Processes ◽  
Real Wastewater ◽  
By Products

The application of Fenton-based advanced oxidation processes (AOPs), such as photo-Fenton or electro-Fenton for wastewater treatment have been extensively studied in recent decades due to its high efficiency for the decomposition of persistent organic pollutants. Usually Fenton-based AOPs are used for the degradation of targeted pollutant or group of pollutants, which often leads to the formation of toxic by-products possessing a potential environmental risk. In this work, we have collected and reviewed recent findings regarding the feasibility of Fenton-based AOPs (photo-Fenton, UVC/H2O2, electro-Fenton and galvanic Fenton) for the detoxification of real municipal and industrial wastewaters. More specifically, operational conditions, relevance and suitability of different bioassays for the toxicity assessment of various wastewater types, cost estimation, all of which compose current challenges for the application of these AOPs for real wastewater detoxification are discussed.

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