The Application of Response Surface Methodology in the Study of Photodegraded Industrial Dairy Effluents by the Photo-Fenton Process: Optimization and Economic Viability

This study presents results from an application of Photo-Fenton process for organic-load reduction in dairy effluents. Process efficiency was evaluated in terms of percentage dissolved organic carbon, chemical oxygen demand, and biochemical oxygen demand (DOC, COD, and BOD, resp.), whose initial values were 1658±145 mg O2 L−1, 9500±500 mg O2 L−1, and 2400 ± 100 mg O2 L−1, respectively. We applied a statistical design represented by Box-Behnken factorial design inclusive of Fenton's reagent, the power of applied radiation (W), and pH factors. The set temperature value was 30°C with a reaction time of 60 min. The maximum efficiency obtained was at pH=3.5, Fenton reagent in the proportion of 35 g H2O2 + 3.6 g Fe2+, and ultraviolet radiation potency of 28 W. The results obtained for DOC, COD, and BOD were 81%, 90.7%, and 78.8%, respectively. Regarding the cost/benefit evaluation, the variables and their levels should be the following: pH 3.5, 35.0 g H2O2/Fe2+ 3.6 g, and 28 W UV, obtaining a reduction in concentration of 79.5% DOC.

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Treatment of swine wastewater using the Fenton process with ultrasound and recycled iron

Ambiente e Agua - An Interdisciplinary Journal of Applied Science ◽

10.4136/ambi-agua.2453 ◽

2020 ◽

Vol 15 (3) ◽

pp. 1

Author(s):

Jair Juarez João ◽

Cíntia Souza da Silva ◽

José Luiz Vieira ◽

Milena Felipe da Silveira

Keyword(s):

Hydrogen Peroxide ◽

Biological Systems ◽

Oxygen Demand ◽

Swine Wastewater ◽

Organic Load ◽

Fenton Process ◽

Slaughterhouse Wastewater ◽

Pork Production ◽

Biological Sludge ◽

Ultrasound Assisted

Pork production involves the generation of wastewater containing a high pollutant load. Although the biological systems show satisfactory efficiency for the treatment of these effluents, they demand an elevated area for installation and high production of biological sludge. Alternatively, oxidative processes are an alternative for treating such effluents, requiring minor areas and increasing the efficiency of the treatment. We studied the Fenton process assisted with ultrasound for the treatment of swine slaughterhouse wastewater. Nails used in civil construction were used as the iron source. We evaluated the influence of pH, contact time, nail mass, and hydrogen peroxide concentration on color removal, turbidity, chemical oxygen demand (COD) and biochemical oxygen demand (BOD5). The removal of nutrients and oils and greases was also evaluated. The best results using the ultrasound-assisted Fenton process were obtained at pH 3, hydrogen peroxide concentration 90 mg L-1, and a nail unit (2.7g). In these conditions, color, turbidity, COD, and BOD5 removal of 98, 98.2, 84.6, and 98%, respectively, were achieved. The reduction in the other parameters evaluated was above 70%. Catalytic activity maintained above 90% until the sixth cycle of use. In general, the ultrasound-assisted Fenton process using the nail as a catalyst would be an alternative for the treatment of swine slaughterhouse wastewater. This alternative is responsible for the higher removal of organic load and nutrients in a shorter time when compared with biological systems.

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Oxidative degradation of cyan flexo dye with Heterogeneous Fenton reagent - Fe2(MoO4)3 particle

Acta periodica technologica ◽

10.2298/apt1950077g ◽

2019 ◽

pp. 77-85

Author(s):

Vesna Gvoic ◽

Miljana Prica ◽

Djurdja Kerkez ◽

Milena Becelic-Tomin ◽

Aleksandra Kulic ◽

...

Keyword(s):

Iron Concentration ◽

Oxidative Degradation ◽

Oxygen Demand ◽

Process Efficiency ◽

High Catalytic Activity ◽

Organic Carbon Content ◽

Fenton Reagent ◽

Heterogeneous Fenton ◽

Operational Conditions ◽

Screening Design

Heterogeneous Fenton catalyst Fe2(MoO4)3 was prepared and the process efficiency was evaluated for oxidation of water-based Cyan flexo dye in synthetic aqueous solution and printing wastewater. The removal process of printing dye was analyzed by UV/VIS spectrophotometry, while dye mineralization was evaluated by the determination of total organic carbon content and chemical oxygen demand. Four determinants of the heterogeneous Fenton system, including initial dye concentration, iron concentration, pH and hydrogen peroxide concentration were investigated. Statistical method, definitive screening design was applied to generate optimal operational conditions of the four variables, which maximizes the process of dye removal. The initial dye concentration of 20 mgL-1, catalyst dosage of 0.75 mgL-1, pH of 2 and H2O2 concentration of 11 mM were chosen as the best operational conditions, contributing to 82% of the process efficiency. The Fenton process efficiency of 79% was achieved within the treatment of printing wastewater under optimal conditions for a 90 minute reaction time. The maximum COD removal efficiency was 61.1%, while 67% mineralization was achieved. The obtained results confirmed synergistic effect of Fe3+ and MoO4 2? which contributed to high catalytic activity and high heterogeneous Fenton efficiency.

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Advanced Treatment of Pesticide-Containing Wastewater Using Fenton Reagent Enhanced by Microwave Electrodeless Ultraviolet

BioMed Research International ◽

10.1155/2015/205903 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8 ◽

Cited By ~ 10

Author(s):

Gong Cheng ◽

Jing Lin ◽

Jian Lu ◽

Xi Zhao ◽

Zhengqing Cai ◽

...

Keyword(s):

Organic Contaminants ◽

Oxygen Demand ◽

Cod Removal ◽

Advanced Treatment ◽

Order Kinetic ◽

Fenton Process ◽

Optimal Conditions ◽

Fenton Reagent ◽

Doc Concentration ◽

Initial Ph

The photo-Fenton reaction is a promising method to treat organic contaminants in water. In this paper, a Fenton reagent enhanced by microwave electrodeless ultraviolet (MWEUV/Fenton) method was proposed for advanced treatment of nonbiodegradable organic substance in pesticide-containing biotreated wastewater. MWEUV lamp was found to be more effective for chemical oxygen demand (COD) removal than commercial mercury lamps in the Fenton process. The pseudo-first order kinetic model can well describe COD removal from pesticide-containing wastewater by MWEUV/Fenton, and the apparent rate constant (k) was 0.0125 min−1. The optimal conditions for MWEUV/Fenton process were determined as initial pH of 5, Fe2+dosage of 0.8 mmol/L, and H2O2dosage of 100 mmol/L. Under the optimal conditions, the reaction exhibited high mineralization degrees of organics, where COD and dissolved organic carbon (DOC) concentration decreased from 183.2 mg/L to 36.9 mg/L and 43.5 mg/L to 27.8 mg/L, respectively. Three main pesticides in the wastewater, as Dimethoate, Triazophos, and Malathion, were completely removed by the MWEUV/Fenton process within 120 min. The high degree of pesticides decomposition and mineralization was proved by the detected inorganic anions.

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Removal of Reactive Blue 19 Dye Using Fenton From Aqueous Solution

Avicenna Journal of Environmental Health Engineering ◽

10.15171/ajehe.2018.07 ◽

2018 ◽

Vol 5 (1) ◽

pp. 50-55 ◽

Cited By ~ 1

Author(s):

Fahimeh Moghadam ◽

Najmeh Nori Kohbanan

Keyword(s):

Aqueous Solution ◽

Removal Efficiency ◽

Contact Time ◽

Reactive Dyes ◽

Oxygen Demand ◽

Fenton Process ◽

Fenton Reagent ◽

Reactive Blue 19 ◽

Living Organisms ◽

Adsorption Rates

The discharge of wastewater containing reactive dyes into water sources leads to health hazards. Colors can adversely affect the natural environment due largely to some qualities like carcinogenicity, being mutagenic, toxicity, and coloration of water. Environmental degradation can be attributed to the destruction of living organisms and the increased biological oxygen demand (BOD). The aim of this study was to evaluate the removal of Reactive Blue 19 dye using the Fenton process from aqueous solution. This research was an experimental study, in which the effectiveness of Fenton in color removal was investigated. The factors influencing this process were: pH, color concentration, the ratio of Fenton reagent (H2O2/Fe2+), and contact time. Finally, after determining the optimum concentration of color, pH, the ratio of Fenton reagent, and contact time, the residual adsorption rates in the samples were measured using direct photometry by spectrophotometer in a wavelength of 594 nm. The results showed that the highest removal efficiency was obtained under the conditions of pH =3, the color concentration of 2 mg/L, the ratio of Fenton reagent = 1:5, and the contact time equal to 10 minutes. The Fenton process is able to remove the Reactive Blue 19 under different concentrations. This process achieved the best removal efficiency in acidic pH.

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Degradation of Total organic carbon (TOC) and Chemical oxygen demand (COD) in Petroleum wastewater by solar Photo-Fenton process.

Global NEST Journal ◽

10.30955/gnj.002238 ◽

2017 ◽

Vol 19 (3) ◽

pp. 430-438 ◽

Cited By ~ 1

Keyword(s):

Free Energy ◽

Wastewater Treatment ◽

Reaction Time ◽

Oxygen Demand ◽

Operating Conditions ◽

Oil Refinery ◽

Fenton Process ◽

Optimum Conditions ◽

Fenton Reagent ◽

Acidic Conditions

The aim of this study is to investigate the performance of solar photo-Fenton process (H2O2/Fe2+/Solar) to treat petroleum wastewater from Sohar oil Refinery, Oman. The effect of operating conditions such as pH, reaction time, Fenton ratio, and Fenton reagent concentrations are investigated. The obtained optimum conditions include H2O2 dosage (1 g L-1), Fe+2 dosage (0.08 g L-1), pH (3) and reaction time (180 min). TOC and COD removal rates are 64 % and 78 %, respectively. However, the photolytic process was less efficient in the petroleum wastewater treatment, achieving an 11.5% and 9% of COD and TOC removals, respectively. The solar photo-Fenton process has well efficient for petroleum wastewater treatment in the acidic conditions and more economic by free energy.

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Cost-Benefit Evaluation for Battery Energy Storage Considering Degradation and Data Clustering in Performance-Based Frequency Regulation Service

2020 IEEE 4th Conference on Energy Internet and Energy System Integration (EI2) ◽

10.1109/ei250167.2020.9346714 ◽

2020 ◽

Author(s):

Xueling Zheng ◽

Ye Su ◽

Luping Wei ◽

Jiangfeng Zhang ◽

Xinwei Shen ◽

...

Keyword(s):

Energy Storage ◽

Data Clustering ◽

Cost Benefit ◽

Frequency Regulation ◽

Battery Energy Storage ◽

Benefit Evaluation ◽

Battery Energy

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The Start-Up of Continuous Biohydrogen Production from Cheese Whey: Comparison of Inoculum Pretreatment Methods and Reactors with Moving and Fixed Polyurethane Carriers

Applied Sciences ◽

10.3390/app11020510 ◽

2021 ◽

Vol 11 (2) ◽

pp. 510

Author(s):

Elza R. Mikheeva ◽

Inna V. Katraeva ◽

Andrey A. Kovalev ◽

Dmitriy A. Kovalev ◽

Alla N. Nozhevnikova ◽

...

Keyword(s):

Cheese Whey ◽

Hydraulic Retention Time ◽

Continuous Production ◽

Oxygen Demand ◽

Organic Load ◽

Anaerobic Sludge ◽

Acid Pretreatment ◽

Methanogenic Activity ◽

Start Up ◽

Load Rate

This article presents the results of the start-up of continuous production of biohydrogen from cheese whey (CW) in an anaerobic filter (AF) and anaerobic fluidized bed (AFB) with a polyurethane carrier. Heat and acid pretreatments were used for the inactivation of hydrogen-scavengers in the inoculum (mesophilic and thermophilic anaerobic sludge). Acid pretreatment was effective for thermophilic anaerobic sludge to suppress methanogenic activity, and heat treatment was effective for mesophilic anaerobic sludge. Maximum specific yields of hydrogen, namely 178 mL/g chemical oxygen demand (COD) and 149 mL/g COD for AFB and AF, respectively, were obtained at the hydraulic retention time (HRT) of 4.5 days and organic load rate (OLR) of 6.61 kg COD/(m3 day). At the same time, the maximum hydrogen production rates of 1.28 and 1.9 NL/(L day) for AF and AFB, respectively, were obtained at the HRT of 2.02 days and OLR of 14.88 kg COD/(m3 day). At the phylum level, the dominant taxa were Firmicutes (65% in AF and 60% in AFB), and at the genus level, Lactobacillus (40% in AF and 43% in AFB) and Bifidobacterium (24% in AF and 30% in AFB).

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