scholarly journals Reuse of Electrocoagulated Metal Hydroxide Sludge to Fluoride and Arsenic Removal by a Fixed-Bed Column in Continuous Operation

2018 ◽  
Author(s):  
Celestino García-Gómez ◽  
María Lourdes Rivera-Huerta ◽  
Fabián Almazán-García ◽  
Alejandra Martín-Domínguez ◽  
Vianey Ariadna Burboa-Charis ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Fixed Bed ◽  
Metal Hydroxide ◽  
Breakthrough Volume ◽  
Fixed Bed Column ◽  
Surface Areas ◽  
Aqueous Effluents ◽  
Electrocoagulation Process ◽  
Fixed Beds ◽  
Central Composite

In the present study, Electrocoagulated Metal Hydroxide Sludge (EMHS) was analyzed as adsorbent material to remove both fluoride ion (F-) and arsenic V (As(V)) from aqueous effluents. This material was generated during an electrocoagulation process using Aluminum anode. It was characterized by using specific surface areas and the surface morphology was studied by scanning electron microscopy (SEM). Adsorbent fixed-beds are generally studied to remove different class of contaminants. EMHS was evaluated using a continuous flow rate column test with an experimental design. The effect of initial concentration of F- (2.5–10 mg L−1) and the Empty Bed Contact Time (EBCT (0.4–0.8 min)) was studied following a central composite design methodology. The experimented parameters had a significant influence on saturation time, breakthrough volume, and breakthrough time. A response surface analysis was a tool for analyzing the adsorption study, showing interactions that are complicated to identify by others methods. The results, here reported, revealed that EMHS is an efficient and promising adsorbent material in order to remove F- and As(V) from water contaminated by these pollutants.

scholarly journals REMOVAL OF CONGO RED DYE USING ELECTROCOAGULATED METAL HYDROXIDE IN A FIXED-BED COLUMN: CHARACTERIZATION, OPTIMIZATION AND MODELING STUDIES

2019 ◽  
Vol 18 (3) ◽  
pp. 1133-1142 ◽  
Author(s):  
S.I. Suárez-Vázquez ◽  
◽  
J.A. Vidales-Contreras ◽  
J.M. Márquez-Reyes ◽  
A. Cruz-López ◽  
...  
Keyword(s):  
Congo Red ◽  
Fixed Bed ◽  
Metal Hydroxide ◽  
Fixed Bed Column ◽  
Congo Red Dye ◽  
Modeling Studies ◽  
Red Dye

Arsenic removal in a sulfidogenic fixed-bed column bioreactor

2014 ◽  
Vol 269 ◽  
pp. 31-37 ◽  
Author(s):  
Muslum Altun ◽  
Erkan Sahinkaya ◽  
Ilknur Durukan ◽  
Sema Bektas ◽  
Kostas Komnitsas
Keyword(s):  
Arsenic Removal ◽  
Fixed Bed ◽  
Fixed Bed Column ◽  
Column Bioreactor

Investigation of Arsenic Removal from Water by Iron-Mixed Mesoporous Pellet in a Continuous Fixed-Bed Column

2018 ◽  
Vol 229 (9) ◽  
Author(s):  
Borano Te ◽  
Boonchai Wichitsathian ◽  
Chatpet Yossapol ◽  
Watcharapol Wonglertarak
Keyword(s):  
Arsenic Removal ◽  
Fixed Bed ◽  
Fixed Bed Column

As(III) Removal by Dynamic Adsorption onto Amberlite XAD7 Functionalized with Crown Ether and Doped with Fe(III) Ions

2019 ◽  
Vol 70 (7) ◽  
pp. 2330-2334
Author(s):  
Mihaela Ciopec ◽  
Adina Negrea ◽  
Narcis Duteanu ◽  
Corneliu Mircea Davidescu ◽  
Iosif Hulka ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Fixed Bed ◽  
World Health ◽  
Arsenic Content ◽  
Arsenic Adsorption ◽  
Stage Of Development ◽  
Wide Range ◽  
Health Organization

Arsenic content in groundwater�s present a wide range of concentration, ranging from hundreds of micrograms to thousands of micrograms of arsenic per litter, while the maximum permitted arsenic concentration established by World Health Organization (WHO) is 10 mg L-1. According to the WHO all people, regardless of their stage of development and their social economic condition, have the right to have access to adequate drinking water. The most efficient and economic technique used for arsenic removal is represented by adsorption. In order to make this remediation technique more affordable and environmentally friendly is important to new materials with advance adsorbent properties. Novelty of present paper is represented by the usage of a new adsorbent material obtained by physical - chemical modification of Amberlite XAD polymers using crown ethers followed by iron doping, due to well-known affinity of arsenic for iron ions. Present paper aims to test the obtained modified Amberlite polymer for arsenic removal from real groundwater by using adsorption in a fixed bed column, establishing in this way a mechanism for the adsorption process. During experimental work was studied the influence of competing ions from real water into the arsenic adsorption process.

Breakthrough analysis for hexavalent chromium removal from drinking water in a fixed bed column

2009 ◽  
Vol 9 (6) ◽  
pp. 661-670 ◽  
Author(s):  
S. P. Dubey ◽  
K. Gopal
Keyword(s):  
Aqueous Solution ◽  
Hexavalent Chromium ◽  
Fixed Bed ◽  
Entropy Change ◽  
Spectroscopic Technique ◽  
Fixed Bed Column ◽  
Chromium Vi ◽  
Fixed Bed Adsorption ◽  
Optimal Column ◽  
Eucalyptus Bark

The activated carbon of Eucalyptus globulus was tested for their effectiveness in removing hexavalent chromium from aqueous solution using column experiments. Result revealed that adsorption of chromium(VI) on eucalyptus bark carbon was endothermic in nature. Thermodynamic parameters such as the entropy change, enthalpy change and Gibbs free energy change were found to be 1.39 kJ mol−1 K−1, 1.08 kJ mol−1 and −3.85 kJ mol−1, respectively. Different chromium concentrations were used for the fixed bed adsorption studies. The pre- and post-treated adsorbents were characterized using a FTIR spectroscopic technique. It was concluded that Eucalyptus bark carbon column could be used effectively for removal of hexavalent chromium from aqueous solution at optimal column conditions. This study showed that this biological material is potential adsorbent of Cr(VI) from water.

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