Electrocoagulation Process by Using Aluminium and Stainless Steel Electrodes to Treat Total Chromium, Colour and Turbidity

Mahmad, Mohd Khairul Nizam; Rozainy, M.A.Z. Mohd Remy; Abustan, Ismail; Baharun, Norlia

doi:10.1016/j.proche.2016.03.070

Cited by 67 publications

(21 citation statements)

References 15 publications

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“…Amorphous iron hydroxides and extracted hydrocarbon structures were found to be the main fractions of the sludge, which is in good agreement with other studies [1][2][3][4][5]. In terms of elementary analysis of the sampled and subsequently dehydrated salty sludge, its carbon content was estimated at 4.5 w%.…”

Section: Resultssupporting

confidence: 90%

“…Iron hydroxide generation induces electrophoretic grouping of negatively charged colloids in the vicinity of a positively charged electrode, i.e. the anode, followed by a formation of polyatomic surface complexations between Fe(II), Fe(III) cations and colloidal anions [1][2][3][4]. In other words, the active functional groups of hydrocarbon chains (HC) are physically adsorbed to Fe(OH) 3 flocs by weaker Van der Waals forces and removal of organic contaminant is a Fe(OH) 3 -driven electrostatic reaction with adsorption of hydrocarbons to hydroxide surfaces to form (HC-Fe(OH) 3 ) coagulates [5].…”

Section: Introductionmentioning

confidence: 99%

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Recycling of a wastewater to iron oxide micro structures

Horváth¹,

Simo²,

Šalgó³

et al. 2019

Environ. Res. Commun.

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The proposed work describes new perspectives for recycling of a salty industrial wastewater to microstructured iron oxides with capturing potential for minor carbon-and metallic contaminations. Byproducts generated by electrochemical treatment of a rubber wastewater with sacrificial steel anode were separated, dried, desalinated, and thermally processed at 800 and 1100°C in a nitrogen atmosphere to investigate the effects of chemically bound oxygen on iron oxide formation. The obtained powder products were different phases of iron oxides, such as hematite, maghemite, magnetite; depending on the annealing temperature. All of the phases are interesting from a recycling point of view, the microstructure, elementary composition and crystallinity of the solid products before and after thermal treatment were investigated via SEM-EDX and PXRD techniques.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Recycling of a wastewater to iron oxide micro structures

Horváth¹,

Simo²,

Šalgó³

et al. 2019

Environ. Res. Commun.

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“…This implies that as OH − ion concentration rises at the cathode vicinity, uniform thinning of the aluminum electrode overwhelms the pitting corrosion by Cl − ions attack. This observation is in agreement with findings of some investigations dealing with corrosion of aluminum in alkaline media [7, 22, 29]. Furthermore, as the current density decreases the amount of aluminum generated increases (Fig.…”

Section: Characterization Of Sludge and Aluminum Plate Electrodes Usisupporting

confidence: 92%

Treatment and characterization of phosphorus from synthetic wastewater using aluminum plate electrodes in the electrocoagulation process

2019

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The main objective of this study is treatment and characterization of phosphorus from synthetic wastewater using aluminum electrodes in the electrocoagulation process. EC experimental setups were designed and different parameters were optimized. The maximum amounts of phosphorus removal efficiencies were observed at pH 7. The phosphorus removal efficiency increases from 85.16 to 97.65% as the temperature increases from 15 to 45 °C, beyond this temperature, there is small effect on removal efficiency. Pollutant removal efficiency increases with an increase in the electrolysis time. At lower initial concentrations the removal efficiencies reached to their maximum values while at the highest initial concentration, the phosphorus removal efficiency was decreased. The increase of current density improves the efficiency of phosphorus removal. Energy and aluminum consumption decreases with increasing initial concentration of phosphorus. Field Emission Scanning Electron Microscope (FESEM) image analysis demonstrated very fine structures for aluminum hydroxide/oxyhydroxides and aluminum phosphate. The existence of the different elemental composition in the sludge was proved by the help of Energy Dispersive X-ray Analysis (EDXS), indicating that the aluminum, oxygen and phosphorus were present in the product. From X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and Raman analyses of the sludge product, it is concluded that the chemical speciation of the by-products can be mostly aluminum hydroxide and aluminum phosphate.

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“…(continued on next page) (continued on next page) ) is around 80% depending on the experimental conditions. It is important to comment that several studies have treated synthetic effluents with higher concentrations of chromium species [49,51,100,102,112,201,219,225,[227][228][229][230][231][232][235][236][237] whereas that the real effluents have not > 100 ppm of chromium species in solution [222,224,230,234] (see Table 2). On the other hand, it was confirmed that the presence of specific anions promotes higher removal efficiencies for CrO [216] examined the elimination of cobalt at different concentrations (25, 100 and 400 ppm) by using a MP-P reactor with Al-Al electrodes at pH 7 with NaCl as supporting electrolyte, obtaining removal efficiencies ranging from 95.5% to 100%.…”

Section: Heavy Metalsmentioning

confidence: 99%

Electrocoagulation and advanced electrocoagulation processes: A general review about the fundamentals, emerging applications and its association with other technologies

Garcia‐Segura

Eiband

Melo

et al. 2017

Journal of Electroanalytical Chemistry

573

213

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The electrocoagulation (EC) process is an electrochemical means of introducing coagulants and removing suspended solids, colloidal material, and metals, as well as other dissolved solids from water and wastewaters. EC process has been successfully employed in removing pollutants, pesticides, and radionuclides. This process also removes harmful microorganisms. More often during EC operation, direct current is applied and electrode plates are sacrificed (dissolved into solution). The electrodissolution causes an increased metal concentration in the solution that finally precipitates as oxides and hydroxides. Due to the process design and low cost material, the EC process is widely accepted over other physicochemical processes. In this frame, this paper presents a general review of efficient EC technologies developed to remove organic and inorganic matter from wastewaters for environmental protection. Fundamentals and main applications of EC as well as progress of emerging EC treatments are reported. The influence of iron or aluminum anode on depollution of synthetic or real effluents is explained. The advantages of EC mechanisms with Al and Fe electrodes are extensively discussed. There are presented the advanced EC processes with in situ generation of hydroxyl radical. The importance of the operating parameters for efficient application of the EC process as well as the combination of this electrochemical technology with electroanalysis techniques and other technologies are commented.

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Electrocoagulation Process by Using Aluminium and Stainless Steel Electrodes to Treat Total Chromium, Colour and Turbidity

Cited by 67 publications

References 15 publications

Recycling of a wastewater to iron oxide micro structures

Recycling of a wastewater to iron oxide micro structures

Treatment and characterization of phosphorus from synthetic wastewater using aluminum plate electrodes in the electrocoagulation process

Electrocoagulation and advanced electrocoagulation processes: A general review about the fundamentals, emerging applications and its association with other technologies

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