Malathion removal by electrocoagulation process: iron and stainless-steel electrodes, direct and alternating current and determining energy and electrode consumption and kinetic study

2020 ◽  
Vol 201 ◽  
pp. 110-120
Author(s):  
Ramin Khaghani ◽  
Nader Yousefi ◽  
Ali Reza Asgari ◽  
Ramin Kholdi Haghighi ◽  
Kamal Ghadiri ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Kinetic Study ◽  
Alternating Current ◽  
Electrode Consumption ◽  
Electrocoagulation Process ◽  
Steel Electrodes

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

2016 ◽  
Vol 19 ◽  
pp. 681-686 ◽  
Author(s):  
Mohd Khairul Nizam Mahmad ◽  
M.A.Z. Mohd Remy Rozainy ◽  
Ismail Abustan ◽  
Norlia Baharun
Keyword(s):  
Stainless Steel ◽  
Total Chromium ◽  
Electrocoagulation Process ◽  
Steel Electrodes

scholarly journals Batch elimination of cationic dye from aqueous solution by electrocoagulation process

2020 ◽  
Vol 10 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Fatima Ezzahra Titchou ◽  
Hanane Afanga ◽  
Hicham Zazou ◽  
Rachid Ait Akbour ◽  
Mohamed Hamdani
Keyword(s):  
Stainless Steel ◽  
Power Consumption ◽  
Industrial Revolution ◽  
Electrical Power ◽  
Oxygen Demand ◽  
Electrode Spacing ◽  
Initial Ph ◽  
Electrocoagulation Process ◽  
Electrical Power Consumption ◽  
Steel Electrodes

Like other developing countries, Morocco has undergone a real industrial revolution that generates a huge amount of colored wastewater. Methylene blue (MB) could be considered as commonly model of cationic dyes that are widely used in industries. In the present work, the removal of MB was investigated in the presence of NaCl as electrolyte by electrocoagulation (EC) process. Parameters studied are the nature of electrodes, electrode spacing, initial dye concentration, agitation speed, applied current density, NaCl concentration, and the effect of the initial pH. Stainless steel electrodes have been used as cathode and anode in the electrochemical cell. The performance of the process was evaluated in terms of color removal, chemical oxygen demand (COD), total organic carbon (TOC), electrical power consumption, current efficiency, and the quantity of sludge formed. The results showed that the removal percent of 20 mg/L MB is 100 %, using stainless steel electrodes with an interspace of 1.5 cm and 20 mA/cm² for 6 min in the presence of 0.1 M NaCl at natural pH. COD and TOC removals within 15 min were 45% and 51% respectively. The power consumption, in that case, was 5.84 KWh/m3, while the amount of sludge formed was 1.64 Kg/m3.

scholarly journals DISSOLUTION OF STAINLESS STEEL IN SODIUM CHLORIDE SOLUTION AT POLARIZATION BY NON-STATIONARY CURRENT

2021 ◽  
Vol 447 (3) ◽  
pp. 75-81
Author(s):  
R.N. Nurdillayeva ◽  
Zh.G. Sauirbay ◽  
A.B. Bayeshov
Keyword(s):  
Stainless Steel ◽  
Current Efficiency ◽  
Alternating Current ◽  
Dissolution Behavior ◽  
Stainless Steel Electrode ◽  
Half Cycle ◽  
Electrochemical Dissolution ◽  
Steel Electrode ◽  
Current Frequency ◽  
Steel Electrodes

Stainless steel is in great demand due to its mechanical strength, heat resistance, and resistance to corrosive environments. This article presents the result of a study of the electrochemical dissolution behavior of a stainless steel electrode (12X18H10T) at polarization by 50 Hz alternating current in a neutral medium (NaCl). Preliminary experiments have shown that the main processes do not take place when two stainless steel electrodes are polarized with an alternating current. It was observed that by the polarization of the “stainless steel – titanium” pair electrodes with alternating current, the alloy is intensively dissolved with the formation of iron (II) and chromium (III) ions. This is due to the "valve" properties of the oxide layer formed on the surface of the titanium electrode. A change in the value of the current density of the titanium and steel electrodes significantly affects the process of electrochemical dissolution of the alloy. At high current densities, the dissolution rate of the alloy decreases due to the deterioration of the current correcting properties of titanium. With an increase in the electrolyte concentration, the current efficiency is reduced as salt passivation occurs. A maximum value of the current efficiency of dissolution of stainless steel was observed at a current frequency of 50 Hz. High frequencies of the alternating current do not provide an adjustable duration of the anodic half-cycle for the oxidation reaction due to the frequent change of halfcycles of the alternating current. It was observed that increasing the temperature of the electrolyte reduces the current efficiency of the electrochemical dissolution of stainless steel electrodes. The effects of main electrochemical parameters on the electrolysis process have been investigated, and the optimal conditions of the alloy dissolution were established (іТі = 60 kA/m2 , іSS = 800 A/m2 , [NaCl] = 2.0 M, t = 30, ν = 50 Hz.).

Alginate/Bioglass® composite coatings on stainless steel deposited by direct current and alternating current electrophoretic deposition

2013 ◽  
Vol 233 ◽  
pp. 49-56 ◽  
Author(s):  
Qiang Chen ◽  
Luis Cordero-Arias ◽  
Judith A. Roether ◽  
Sandra Cabanas-Polo ◽  
Sannakaisa Virtanen ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Electrophoretic Deposition ◽  
Direct Current ◽  
Composite Coatings ◽  
Alternating Current
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