Volume 16, Issue 4 (3-2024)
ijhe 2024, 16(4): 805-820 |
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Shekoohiyan S, Pourakbar M, Zohdi Shiran A, Ghanbari F, Mahdavianpour M, Aghayani E. Effectiveness of chemical and electrical coagulation process in removing fluoride from the wastewater of the pre-painting unit of the automotive industry. ijhe 2024; 16 (4) :805-820
URL: http://ijhe.tums.ac.ir/article-1-6808-en.html
URL: http://ijhe.tums.ac.ir/article-1-6808-en.html
Sakine Shekoohiyan1 
, Mojtaba Pourakbar2 , Asghar Zohdi Shiran3 , Farshid Ghanbari4 , Mostafa Mahdavianpour4 , Ehsan Aghayani * 5
, Mojtaba Pourakbar2 , Asghar Zohdi Shiran3 , Farshid Ghanbari4 , Mostafa Mahdavianpour4 , Ehsan Aghayani * 5
1- Department of Environmental Health Engineering, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
2- Department of Environmental Health Engineering, Maragheh University of Medical Sciences, Maragheh, Iran
3- Senior Expert in Coordination and Communication with Scientific and Academic Centers, Iran Khodro Company, Tehran, Iran
4- Department of Environmental Health Engineering, Faculty of Health, Abadan University of Medical Sciences, Abadan, Iran
5- Department of Environmental Health Engineering, Faculty of Health, Abadan University of Medical Sciences, Abadan, Iran ,e.aghayani@abadanums.ac.ir
2- Department of Environmental Health Engineering, Maragheh University of Medical Sciences, Maragheh, Iran
3- Senior Expert in Coordination and Communication with Scientific and Academic Centers, Iran Khodro Company, Tehran, Iran
4- Department of Environmental Health Engineering, Faculty of Health, Abadan University of Medical Sciences, Abadan, Iran
5- Department of Environmental Health Engineering, Faculty of Health, Abadan University of Medical Sciences, Abadan, Iran ,
Abstract: (520 Views)
Background and Objective: The development of the automobile industry has caused various pollutants to enter the environment, one of which is fluoride. Therefore, this study aims to improve the fluoride removal from wastewater pre-paint units of the automotive industry to achieve discharge standards to surface waters.
Materials and Methods: The study is descriptive and on an applied scale, which has been carried out to compare the efficiency of the chemical coagulation process using lime and alum, as well as the electrocoagulation process using aluminum anodes in the presence of lime to remove fluoride.
Results: The results of real wastewater characteristics showed that the pH of wastewater is in the range of 6.1 to 6.3, and its fluoride concentration is in the range of 45 to 55 mg/L. The results of the experiments show that in the most optimal possible state in the chemical coagulation process, it is possible to achieve fluoride removal efficiency in the range of 76 to 81 percent. However, the removal efficiency in the electrocoagulation process using an aluminum anode at a concentration of 5 mol/L of calcium ions, and current density of 20 A/m2 after reaction time of min 20 to 99% can also be achieved.
Conclusion: Considering the high fluoride removal rate (more than 99%) in the electrocoagulation process in the presence of calcium ions, this process can be introduced as an efficient technology for fluoride removal.
Materials and Methods: The study is descriptive and on an applied scale, which has been carried out to compare the efficiency of the chemical coagulation process using lime and alum, as well as the electrocoagulation process using aluminum anodes in the presence of lime to remove fluoride.
Results: The results of real wastewater characteristics showed that the pH of wastewater is in the range of 6.1 to 6.3, and its fluoride concentration is in the range of 45 to 55 mg/L. The results of the experiments show that in the most optimal possible state in the chemical coagulation process, it is possible to achieve fluoride removal efficiency in the range of 76 to 81 percent. However, the removal efficiency in the electrocoagulation process using an aluminum anode at a concentration of 5 mol/L of calcium ions, and current density of 20 A/m2 after reaction time of min 20 to 99% can also be achieved.
Conclusion: Considering the high fluoride removal rate (more than 99%) in the electrocoagulation process in the presence of calcium ions, this process can be introduced as an efficient technology for fluoride removal.
Type of Study: Research |
Subject:
wastewater
Received: 2023/06/28 | Accepted: 2024/01/3 | Published: 2024/03/5
Received: 2023/06/28 | Accepted: 2024/01/3 | Published: 2024/03/5
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