Degradation of ciprofloxacin using Fenton's oxidation: Effect of operating parameters, identification of oxidized by-products and toxicity assessment

Chemosphere ◽  
2018 ◽  
Vol 193 ◽  
pp. 1181-1188 ◽  
Author(s):  
Anirudh Gupta ◽  
Anurag Garg
Keyword(s):  
Toxicity Assessment ◽  
Parameters Identification ◽  
Operating Parameters ◽  
Fenton’S Oxidation ◽  
Fenton's Oxidation ◽  
Oxidation Effect ◽  
By Products

Comparison of Fenton's oxidation and ozonation for removal of estrogens

2011 ◽  
Vol 63 (10) ◽  
pp. 2131-2137 ◽  
Author(s):  
Jana Nakrst ◽  
Mirjana Bistan ◽  
Tatjana Tišler ◽  
Jana Zagorc-Končan ◽  
Jan Derco ◽  
...  
Keyword(s):  
Estrogenic Activity ◽  
Complete Removal ◽  
Molar Ratio ◽  
Chemical Analyses ◽  
Screening Assay ◽  
Molar Ratios ◽  
Fenton’S Oxidation ◽  
17Β Estradiol ◽  
Fenton's Oxidation ◽  
By Products

This study compares efficiency of Fenton's oxidation and ozonation of 17β-estradiol (E2) and 17α-ethinylestradiol (EE2) as two possible processes for removal of estrogens from aqueous solutions. The effectiveness of Fenton's oxidative removal was studied at different ratios of reagents Fe2+:H2O2 (1:0.5; 1:10; 1:20; 1:33), where with some molar ratios up to 100% removal of E2 and EE2 was achieved in the first few minutes of reaction. The best molar ratio for E2 (17β-estradiol) removal was 1:33, while in the case of EE2 the most efficient one was 1:20 ratio. Ozonation was much faster, because complete removal of estrogens was achieved in 30 seconds (pH≈6), but the time of ozonation was extended up to 60 minutes trying to decompose formed by-products, expressing estrogenic activity, detected by YES (Yeast Estrogen Screening) assay. The obtained results showed that the removal efficiency of estrogens from waters should be assessed by a combination of chemical analyses and bioassay.

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.

Integrated Strategy for Treatment of Winery Wastewaters Using Flocculation, Ozonation and Fenton’s Oxidation

2009 ◽  
Vol 12 (2) ◽  
Author(s):  
Rui C. Martins ◽  
Fernando J.R. Abegão ◽  
Adrián M.T. Silva ◽  
Rosa M. Quinta-Ferreira
Keyword(s):  
Suspended Solids ◽  
Oxygen Demand ◽  
Operational Cost ◽  
Adequate Treatment ◽  
Integration Strategy ◽  
Fenton’S Oxidation ◽  
Optimal Efficiency ◽  
Fenton's Oxidation ◽  
Ozonation Process

AbstractThe present research is based on a case-study involving the development of an adequate treatment for agro-effluents originating from wineries. Flocculation, Fenton’s oxidation and ozonation processes were investigated in order to define the best integration strategy that may conduce to optimal efficiency of degradation and operational cost. Chemical oxygen demand (COD), total suspended solids (TSS), and total organic carbon (TOC) were some of the parameters used to analyze the performance of these technologies. The higher COD and TSS removals (73% and 94% respectively) were achieved combining the ozonation treatment with the Fenton process. In addition, the respective cost of COD reduction is lower in this case, when compared with other alternatives. Flocculation revealed not to be needed since in the ozonation process the suspended solids are able to be degraded.

scholarly journals A novel process of dye wastewater treatment by linking advanced chemical oxidation with biological oxidation

2015 ◽  
Vol 41 (4) ◽  
pp. 33-39 ◽  
Author(s):  
Haiming Zou ◽  
Wanzheng Ma ◽  
Yan Wang
Keyword(s):  
Oxidation Process ◽  
Chemical Oxidation ◽  
Chinese Government ◽  
Biological Oxidation ◽  
Dye Wastewater ◽  
Organic Substances ◽  
Combination Process ◽  
Fenton’S Oxidation ◽  
New Process ◽  
Fenton's Oxidation

Abstract Dye wastewater is one of typically non-biodegradable industrial effluents. A new process linking Fenton’s oxidation with biological oxidation proposed in this study was investigated to degrade the organic substances from real dye wastewater. During the combination process, the Fenton’s oxidation process can reduce the organic load and enhance biodegradability of dye wastewater, which is followed by biological aerated filter (BAF) system to further remove organic substances in terms of discharge requirement. The results showed that 97.6% of chemical oxygen demand (COD) removal by the combination process was achieved at the optimum process parameters: pH of 3.5, H2O2 of 2.0 mL/L, Fe(II) of 500 mg/L, 2.0 h treatment time in the Fenton’s oxidation process and hydraulic retention time (HRT) of 5 h in the BAF system. Under these conditions, COD concentration of effluent was 72.6 mg/L whereas 3020 mg/L in the influent, thus meeting the requirement of treated dye wastewater discharge performed by Chinese government (less than 100 mg/L). These results obtained here suggest that the new process combining Fenton’s oxidation with biological oxidation may provide an economical and effective alternative for treatment of non-biodegradable industrial wastewater.

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