Efficient removal of phenol from aqueous solution by the pulsed high-voltage discharge process in the presence of H2O2

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Removal Efficiency ◽  
High Voltage ◽  
Treatment Time ◽  
Phenol Degradation ◽  
Temperature Treatment ◽  
Phenol Removal ◽  
Discharge Process ◽  
Efficient Removal ◽  
Solution Ph ◽  
High Voltage Discharge

This study investigates the phenol degradation by pulsed high-voltage discharge (PHVD). The effect of solution pH, temperature, treatment time and initial phenol concentration on phenol degradation were examined. The results showed that the phenol removal efficiency was increased with the rise of pH, temperature and treatment time. The phenol removal efficiency was 48%, 46%, 42% and 34%, respectively at 10, 40, 90 and 160 ppm phenol solutions. The phenol degradation rate was increased markedly when H2O2 was added into the solution. Almost complete phenol degradation (100%) was achieved when 20-40 mM of H2O2 was added into phenol solutions of 40, 90 and 180 ppm.

scholarly journals Studies on phenol removal from wastewater with CTAB-modified bentonite supported KMnO4

2013 ◽  
Vol 3 (3) ◽  
pp. 204-216 ◽  
Author(s):  
Jing Wang ◽  
Hongzhu Ma ◽  
Jie Yu ◽  
Shanshan Wang ◽  
Wenyan He ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Photoelectron Spectroscopy ◽  
Solid Phase ◽  
Phenol Degradation ◽  
Cod Removal ◽  
Phenol Removal ◽  
Solution Ph ◽  
Modified Bentonite ◽  
X Ray ◽  
Cod Removal Efficiency

Cetyltrimethylammonium bromide (CTAB) modified bentonite supported KMnO4 (KMnO4/CTAB-bent) was prepared by solid-phase grinding method, and applied to phenol removal from wastewater. Factors affecting efficiency, such as activated temperature, initial solution pH, KMnO4/CTAB-bent dosage, phenol initial concentration and reaction temperature on degradation were investigated. It was found that pH significantly affected the degradation and chemical oxygen demand (COD) removal efficiency. The results show that over 92% degradation and 60.58% COD removal efficiency can be obtained in 30 min. The surface properties and structure of KMnO4/CTAB-bent were measured by X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller, and Fourier transform infrared spectroscopy. However, it was demonstrated that the KMnO4/CTAB-bent was deactivated quickly during phenol degradation after the second cycle, indicating that the stability of KMnO4/CTAB-bent needs to be further improved.

scholarly journals A rapid and efficient removal approach for degradation of metformin in pharmaceutical wastewater using electro-Fenton process; optimization by response surface methodology

2019 ◽  
Vol 80 (4) ◽  
pp. 685-694 ◽  
Author(s):  
Maryam Dolatabadi ◽  
Saeid Ahmadzadeh
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Removal Efficiency ◽  
Degradation Mechanism ◽  
Pharmaceutical Products ◽  
Oh Radicals ◽  
Order Kinetic ◽  
Pharmaceutical Wastewater ◽  
Efficient Removal ◽  
Solution Ph

Abstract Presence of emerging contaminants such as pharmaceutical products in aquatic environments has received high concern due to their undesirable effect on wildlife and human health. Current work deals with developing a treatment model based on the electro- Fenton (EF) process for efficient removal of metformin (MET) from an aqueous medium. The obtained experimental results revealed that over the reaction time of 10 min and solution pH of 3, the maximum removal efficiency of 98.57% is achieved where the value of MET initial concentration, current density, and H2O2 dosage is set at 10 mg.L−1, 6 mA.cm−2, and 250 μL.L−1, respectively, which is in satisfactory agreement with the predicted removal efficiency of 98.6% with the desirability of 0.99. The presence of radical scavengers throughout the mineralization of MET under the EF process revealed that the generation of •OH radicals, as the main oxidative species, controlled the degradation mechanism. The obtained kinetics data best fitted to the first order kinetic model with the rate constant of 0.4224 min−1 (R2 = 0.9940). The developed treatment process under response surface methodology (RSM) was employed for modeling the obtained experimental data and successfully applied for efficient removal of the MET contaminant from pharmaceutical wastewater as an adequate and cost-effective approach.

Phenol Removal from Water by Pulsed Power Discharge: A Review

2013 ◽  
Vol 64 (4) ◽  
Author(s):  
Hashem Ahmadi ◽  
Muhammad Abu Bakar Sidik ◽  
Mehrdad Khamooshi ◽  
Zulkafle Buntat
Keyword(s):  
High Voltage ◽  
Pulsed Power ◽  
Phenol Removal ◽  
Advantages And Disadvantages ◽  
High Voltage Discharge ◽  
Significant Effort

In the last three decades, pulsed high voltage discharge technology has offered promising techniques for the treatment of wastewaters released to the environment by industry. A significant effort has been directed towards understanding the processes that occur during the discharge of solutions for a variety of reactor configurations. This review presents the disadvantages and advantages of different reactors based on discharge phase. Detailed information is also provided on the principals used in each technique and the advantages and disadvantages associated with each method. Finally, a discussion on the different discharge areas is presented.

Biodegradation of High Phenol Concentration in a Membrane Bioreactor

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Benoît Marrot ◽  
Adrian Barrios-Martinez ◽  
Philippe Moulin ◽  
Nicolas Roche
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Membrane Bioreactor ◽  
Substrate Inhibition ◽  
Phenol Degradation ◽  
Phenol Concentration ◽  
Phenol Removal ◽  
Permeate Flux ◽  
Phenol Biodegradation ◽  
Haldane Model

Phenol biodegradation by mixed culture was studied in a membrane bioreactor (MBR) over a period of 285 days. Activated sludge was used as the MBR biomass, after controlled acclimation to high phenol concentrations. The MBR permeate flux was stabilized quickly (in a few hours) and always maintained above 90 L.h-1.m-2.bar-1. The acclimatized activated sludge allowed significant phenol degradation (95% average COD removal efficiency and greater than 99% phenol removal efficiency) without supplemental reagent addition. After sludge acclimatization, the Haldane kinetics model for a single substrate was used to obtain the maximum specific growth rate (µm = 0.438 h-1), the half saturation coefficient (Ks = 29.54 mg.L-1) and the substrate inhibition constant (Ki = 72.45 mg.L-1). Biodegradation experiments were conducted at different phenol concentrations (4.9 – 8.5 g.L-1 d-1). Although the phenol concentration was high, the Haldane model was still acceptable, and removal capacities were in agreement with literature. Excellent effluent quality was obtained regardless of the extremely short SRT (5 – 17 days). This work shows the potential of MBR for toxic chemical elimination, charged effluents treatment and process stability.

The Effects of Using Various Types of Pulsed Discharge Reactors for Phenol Removal in Waste Water

2003 ◽  
Vol 6 (1) ◽  
Author(s):  
Shinta Kunitomo ◽  
Tadashi Ohbo ◽  
Bing Sun
Keyword(s):  
Hydrogen Peroxide ◽  
Removal Efficiency ◽  
Degradation Rate ◽  
Phenol Degradation ◽  
Phenol Removal ◽  
Pulsed Discharge ◽  
Discharge Characteristics ◽  
Reactor Configuration ◽  
Different Types ◽  
Degradation Properties

AbstractIn this investigation, the pulsed discharge characteristics in water and the phenol-degradation properties of three different types of reactors, which had rod-rod, rod-plate and wire-cylinder format, were studied. Among the three types of reactors, it was found that the phenol removal efficiency was highest for the wirecylinder reactor configuration. In addition, the influence of pulse energy for removal efficiency was investigated. The removal efficiency at 180 kV-72 J discharged is higher than at 180 kV-960 J discharged. Furthermore, the effect of hydrogen peroxide on phenol removal efficiency was also studied under conditions of 120 kV-72 J, and it was found that the phenol degradation rate was higher when hydrogen peroxide was used.

scholarly journals Treatment of petroleum refinery wastewater by electrochemical oxidation using graphite anodes

2019 ◽  
Vol 12 (3) ◽  
pp. 144-150
Author(s):  
Sajjad Sarhan Jawad ◽  
Ali H. Abbar
Keyword(s):  
Electrochemical Oxidation ◽  
Removal Efficiency ◽  
Current Density ◽  
Treatment Time ◽  
Petroleum Refinery ◽  
Electrochemical Reactor ◽  
Phenol Removal ◽  
Nacl Concentration ◽  
Graphite Anodes ◽  
Petroleum Refinery Effluent

An electrochemical oxidation method was performed in a batch electrochemical reactor using graphite anodes for treating an effluent obtained from Al-Diwaniyah petroleum refinery plant. The effective f process parameters like current density (4-20m Acm-2), pH (3-9), and NaCl concentration (0-3 g/l) on the COD and phenol removal efficiency have been investigated. The results reveal that the best conditions were current density 12 mA cm-2, pH 7, NaCl concentration 2 gl-1 at a treatment time of 60 minutes. Under  best conditions of COD removal efficiency 100% and phenol removal efficiency 99.12% were obtained at current efficiency 33.5% and power consumption 59.9 kWh/kg COD. The anodic oxidation was proven to be efficient for treatment Al-Diwaniyah petroleum refinery effluent to get effluent with features in agreement with the standard limits for discharge to the environment at a lower cost.

scholarly journals Phenol Removal using Corona Discharge Plasma Combined with Porous Polyaniline Nanofiber

2021 ◽  
Author(s):  
Ahmed El-Tayeb Khalil ◽  
Hussain Noby ◽  
AHMED H ELSHAZLY ◽  
Marwa F. Elkady
Keyword(s):  
Corona Discharge ◽  
Discharge Plasma ◽  
Treatment Time ◽  
Phenol Degradation ◽  
Synergetic Effect ◽  
Chemical Oxidation ◽  
Bet Surface Area ◽  
Phenol Removal ◽  
Polyaniline Nanofiber ◽  
Corona Discharge Plasma

Abstract A contemporary design for a recirculated flow dual remediation system was successfully developed for phenol remediation. The system involved Corona Discharge Plasma (CDP), accompanied by Polyaniline Nanofiber (PANNFs) as a solid adsorbent. PANNFs was obtained using simple chemical oxidation polymerization at room temperature. Different chemo-physical characterization techniques were employed to examine the produced polyaniline such as Fourier Transform Infrared spectroscopy (FT-IR), X-ray Diffraction (XRD), and Brunauer, Emmett, and Teller (BET) surface area analysis. The primary purpose of the used PANNF powder is to facilitate the phenol degradation using plasma by collecting the phenol molecules on the surface of PANNFs. The phenol removal percentage of 99% was attained at a treatment time of 60 min using the developed dual system. Finally, a slight synergetic effect between the used two remediation processes, PANI as adsorbent and CDP treatment, was approved. PANNFs existence in the remediation system also helps to save the consumed power in degradation using CDP.

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