scholarly journals Removal of Reactive Dyes by Electro Coagulation Process from Aqueous Solution

2020 ◽  
Vol 26 (2) ◽  
pp. 14-28
Author(s):  
Zahraa A Sadoon ◽  
Mohanad J. M-Ridha
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Room Temperature ◽  
Reactive Dyes ◽  
Nacl Concentration ◽  
The World ◽  
Aluminum Electrodes ◽  
Electro Coagulation ◽  
The Impact ◽  
Dyes Removal

The presence of dyes in wastewater has become a major issue all over the world. The discharge of dyes in the environment is concerned for both toxicological and esthetical reasons. In this study, the removal of dyes from aqueous solution by electrocoagulation using aluminum electrodes as cathode and anode were investigated with the electrocoagulation cell of 1litter. The study included: the impact of various operating parameters on the dyes removal efficiency like pH, NaCl concentration, distance between electrodes, voltage, initial dyes concentration and type of electrodes. The dye (congo red) concentrations were (50, 100, 150, and 200 ppm), stirring speed was 120 rpm at room temperature. pH used was maintained constant. The impact of voltage values was chosen as 6, 10, and 14 Volts. On increasing voltage dyes, removals increased significantly. The higher removal efficiency of dyes (99.9%) was achieved at (30) minutes for (Al/Al) electrodes at pH 6.5-7 and voltage 14 Volts. The results showed that the best amount of sodium chloride was found to be 600 ppm in dyes, voltage of 14 Volts, and best gap between the electrodes as 0.5 cm.

scholarly journals Optimization of the electro coagulation process for the removal of cadmium from aqueous solution using RSM

2019 ◽  
Vol 26 (4) ◽  
pp. 52-64
Author(s):  
Zahraa Adil Sadoon ◽  
Mohanad J. M-Ridha
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Room Temperature ◽  
Operating Time ◽  
Ion Concentration ◽  
Best Value ◽  
Nacl Concentration ◽  
Initial Ph ◽  
Electro Coagulation ◽  
The Impact

A certain of industrialized wastewater streams include heavy metal ions, should be efficiently removal before the reuse or discharge of treated waters could occur. In this work, the removal of cadmium from aqueous solution was carried out by electro coagulation using aluminum electrodes as anode and cathode. Electro coagulation cell of 1litter was used in this research. Several operating parameters on the removal efficiency of cadmium were investigated, such as initial pH, voltage, initial cadmium  ion concentration, NaCl concentration, spacing between electrodes, and  type of electrode . The Cd(II) concentration (50 ,100,150,200 ppm),( stirring speed 120 rpm) at room temperature . A pH was use   to be a constant best value when studied the  impact  of voltage values were chosen as 6,10,  and 14 increasing voltage  increased Cd(II) removals significantly Removal of 30.1%, 94.1%, 97.4%. The optimum removal efficiency of 97.4 % was achieved at a voltage of 14 V and pH 5 using (Al/Al.) electrodes, within 60 min of operating time. The concentration of NaCl was 0.6 g/l with a 0. 5 cm spacing between the electrodes.

Destruction of EDTA by Bimetallic Al-Fe/O2 Process under Aqueous Room Temperature and Pressure Conditions

2013 ◽  
Vol 800 ◽  
pp. 555-559
Author(s):  
Xin Liu ◽  
Jin Hong Fan ◽  
Lu Ming Ma
Keyword(s):  
Aqueous Solution ◽  
Benzoic Acid ◽  
Removal Efficiency ◽  
Room Temperature ◽  
Ethylenediaminetetraacetic Acid ◽  
Oxidative Degradation ◽  
Hydroxybenzoic Acid ◽  
Mass Ratio ◽  
Initial Ph ◽  
Temperature And Pressure

Oxidative degradation of ethylenediaminetetraacetic acid (EDTA) in aqueous solution at room temperature and pressure by the bimetallic Al-Fe/O2 process, which was verified by the addition of benzoic acid as ·OH scavenger and the detection of para-hydroxybenzoic acid, was investigated. The results showed that the removal efficiency of EDTA, TOC and TN could be about 98%, 77.5% and 43% respectively after 3h reaction when the initial pH was 5. The effects of initial pH, concentration of EDTA, mass ratio of Al0 and Fe0 and Al-Fe loading were also investigated. Significantly, the bimetallic Al-Fe process exhibited higher reactivity than monometallic Fe0/Al0 process for the degradation of EDTA when the mass ratio of Al0 and Fe0 ranged from 0.11 to 2.97.

scholarly journals REMOVAL OF TOTAL PHOSPHORUS FROM MUNICIPAL WASTEWATER USING CYLINDRICAL ALUMINUM ELECTRODE IN CONTINUOUS MODE

2018 ◽  
Vol 54 (4B) ◽  
pp. 88
Author(s):  
Tran Tuan Viet
Keyword(s):  
Removal Efficiency ◽  
Total Phosphorus ◽  
Municipal Wastewater ◽  
High Efficiency ◽  
Sewage Treatment ◽  
Aluminum Electrode ◽  
Continuous Mode ◽  
Nacl Concentration ◽  
Electro Coagulation ◽  
P Removal

This study aimed to apply electro-coagulation method using cylindrical Aluminum electrode in continuous mode to remove total phosphorus (T-P) in municipal wastewater. The effects of NaCl concentration (or conductivity) and hydraulic retention time (HRT, or flow rate) on T-P removal efficiency were investigated. To determine the efficiency of this system the ratio Al consumption/T-P removal was also considered. The results showed that, with raw sewage as influent, HRT = 1.17 min and added NaCl = 0.04 % was found the best conditions for the highest T-P removal efficiency (92.80 %; T-P concentration remainder was 0.17 mg/L) and the ratio Al consumption/T-P removal was 5.0. In general, this method achieves a high efficiency of removing phosphorus from wastewater and it can be used in sewage treatment systems.

scholarly journals Investigation of Electro-coagulation Process for Phosphate and Nitrate Removal From Sugarcane Wastewaters

2021 ◽  
Vol 15 (1) ◽  
pp. 19-26
Author(s):  
Majid Ebadi ◽  
◽  
Ali Asareh ◽  
Reza Jalilzadeh Yengejeh ◽  
Najaf Hedayat ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Retention Time ◽  
Nitrate Removal ◽  
Phosphate Removal ◽  
Septic Tank ◽  
Industrial Complex ◽  
Khuzestan Province ◽  
Coagulation Process ◽  
Aluminum Electrodes ◽  
Electro Coagulation

Background: Highly-concentrated phosphate and nitrate anions from sugarcane wastewater are often discharged into public waters without standardized treatments. This study assessed the effects of electrical coagulation, initial pH and reaction time in the removal of phosphate and nitrate pollutants. Methods: We used aluminum electrodes to remove the pollutants at Hakhim Farabi Agricultural and Industrial complex, Khuzestan Province, Iran. A septic tank was used for collecting water samples followed by measuring the pH, and the concentrations of phosphate and nitrate in the samples. The pH was set at 5, 7, 9 or 11. Six aluminum electrodes were placed perpendicular to the water flow and were connected to power in a single-polar method. They were used to assess the effects of pH changes, electrical power at 10 and 30 volts and the water retention time at 15, 30, 45 or 60 min. on the efficiency of the pollutants’ removal. Results: The results indicated that under equal retention time and varying pH values, as voltage increased from 10 to 30, the phosphate and nitrate removal increased progressively. It was further demonstrated that the maximum phosphate removal efficiency was achieved at pH7, while it declined at higher pH levels. The highest possible nitrate removal efficiency was achieved under alkaline pH levels. The overall results showed that at every pH and voltage, the percentage of phosphate and nitrate removal increased over time. Conclusion: This study demonstrated that electro-coagulation process is an appropriate and efficient method to remove phosphate and nitrate pollutants from sugarcane wastewaters.

Removal of Azo Dyes from Aqueous Solution by Composite HKUST-1/GO

Nano LIFE ◽  
2015 ◽  
Vol 05 (03) ◽  
pp. 1542003 ◽  
Author(s):  
Qiong Yi ◽  
Ling Li ◽  
Lu Fan ◽  
Keke Sun ◽  
Lebao Mao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Isotherm ◽  
Removal Efficiency ◽  
Adsorption Isotherms ◽  
Azo Dyes ◽  
Freundlich Isotherm ◽  
Dyes Removal

The adsorption of three kinds of azo dyes from aqueous solution on HKUST-1/graphene oxide (GO) composite was studied in view of the removal efficiency, adsorption isotherm, and regenerate of the sorbent. HKUST-1/GO was found to be with higher dyes removal efficiency than HKUST-1. All the adsorption isotherms of azo dyes on HKUST-1/GO composite followed Freundlich isotherm. The adsorbed azo dyes on HKUST-1/GO could be eluted by acetone, so HKUST-1/GO can also be used for enrichment of azo dyes as adsorbent.

Study on the Removal of Copper Ions from Water Using Eco-Friendly Attapulgite/Chitosan Composites

2012 ◽  
Vol 499 ◽  
pp. 419-422
Author(s):  
Yong Chen ◽  
Hui Xu ◽  
Jin Bao Sun ◽  
Chang Long Zhang
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Room Temperature ◽  
Copper Ions ◽  
External Factors ◽  
Mass Ratio ◽  
Absorption Time ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorbent Dosage

In this work attapulgite and chitosan were employed to prepare composites as eco-friendly adsorbent. Study on the removal efficiency of the adsorbent for copper ions in aqueous solution was carried out. External factors such as the amount of attapulgite in the composites, temperature, initial concentration of copper ions, adsorption time and adsorbent dosage how to influence the removal efficiency of composites were investigated. The results showed that at room temperature, 0.37g adsorbent can reach maximum adsorption rate, which the mass ratio of attapulgite and chitosan is 1:1, the initial concentration of copper ions is 50mg / L and absorption time is 2h.

scholarly journals Adsorption of Iron with Biosorbents derived from Longan Peel, Pomelo Peel and Jackfruit Peel

2021 ◽  
Vol 945 (1) ◽  
pp. 012057
Author(s):  
Yi Jun Chai ◽  
Yee Sern Ng ◽  
Katrina Pui Yee Shak ◽  
Law Yong Ng
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Adsorption Process ◽  
Low Cost ◽  
Batch Adsorption ◽  
Pomelo Peel ◽  
Positive Ions ◽  
Carboxylate Groups ◽  
The World ◽  
Initial Ph

Abstract High iron (Fe2+) concentration in groundwater is a severe issue in many regions of the world. This study attempts to investigate the effectiveness of biosorbents derived from longan peel (LP), pomelo peel (PP) and jackfruit peel (JP) for the adsorption of Fe2+ from aqueous solution in various forms. A batch adsorption study was carried out with an initial Fe2+ concentration of 10 mg/L for 2 h. The results showed that the highest removal efficiency was achieved for PP and its biochar at 97.38% and 99.45%, respectively. High removal efficiency implied that PP contained favourable characteristics for the adsorption of Fe2+. Under the scanning electron microscope (SEM), the surface structure of PP displayed visible dimensions with a relatively large pore size compared with LP and JP. Characterisation study using Fourier-transform infrared spectroscopy (FTIR) reveals that the carboxylate groups and ester carbonyl band participated in the adsorption process. At higher initial pH of 5.83, adsorption of Fe2+ using PP gives higher removal efficiency due to lower competition on electrostatic interaction between positive ions in the solution and the surface of biosorbents. Furthermore, adsorption uptake of 83.0 mg/g was attainable with an initial concentration of 100 mg/L. This study has proven the feasibility of PP as a low cost biosorbents for removing Fe2+ in an aqueous solution.

scholarly journals Removal of Reactive Blue 19 Dye Using Fenton From Aqueous Solution

2018 ◽  
Vol 5 (1) ◽  
pp. 50-55 ◽  
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.

Manufacturing of Heavy Plates with Excellent Mechanical Properties by a 40t ESR Furnace for Slab Products

2009 ◽  
Vol 79-82 ◽  
pp. 1747-1750 ◽  
Author(s):  
Xing Geng ◽  
Zhou Hua Jiang ◽  
Fu Bin Liu ◽  
Hao Peng
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
Tensile Properties ◽  
Room Temperature ◽  
Secondary Cooling ◽  
Welding Condition ◽  
The World ◽  
Cooling Technology ◽  
The Impact

A special bifilar 40t electroslag remelting(ESR) furnace for slab products has been fabricated to produce heavy plates for special application. The slab ingots were rolled to heavy plates, and then the mechanical properties of which were investigated. The impact toughness of heavy plates with different position, directions and under welding condition were performed at the temperature ranging from -70°C to room temperature. The tensile experiments at room temperature were carried out to check the tensile properties of heavy plates in different position, directions and under welding condition. The secondary cooling technology developed improves greatly the quality of solidification. Adjusting taper of the mold and using CaF2-CaO-Al2O3-SiO2-MgO slag are necessary for improving surface quality of the ESR slab. The ESR slabs with the maximum thickness of the world in size of 980 mm thickness, 2000 mm wideness and 2800 mm length have been produced successfully. The heavy plates with 410 mm in thickness can be obtained after rolling the 40 tons ESR slabs. The results of mechanical properties show that the heavy plates produced by ESR furnace for slab products exhibits excellent ductility, impact and isotropic properties in different position, directions and under welding condition.

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