Water defluoridation using coupled Moringa oleifera extract and electrocoagulation.

Presented on Tuesday, December 3, 2019
Oscar Rodriguez1, Oscar Rodriguez2, Braimah Apambire, Ph.D.3 and Erick Bandala3, (1)Division de ciencias naturales y exactas, Guanajuato University, Guanajuato, GJ, Mexico, (2)School of liberal arts and science, Nevada State Collage, (3)Division of Hydrologic Sciences, Desert Research Institute, Las Vegas, NV

Fluoride occurrence in underground water is a significant health concern because it is faced by millions around the world. We used Moringa oleifera (MO) seed extract coupled with electrocoagulation (EC) for fluoride removal from water. MO extract was prepared with 1 g of MO seed flour added into 100 mL (6.6 mM) NaCl solution, stirred 30 min and filtered. The experiments were performed using either deionized (DI) or tap water containing 10 mg L-1 fluoride (NaF, Aldrich). Different MO extract volumes (0.5-2.5 mL of MO extract per 100 mL of water) were used in batch and semi-continuous experiments coupled with EC (3.3 mA cm-2) and different electrode separation (1- 4 cm), all experiments were performed in duplicates. For fluoride quantification, 2 mL of SPANDS fluoride reagent (Hach) were added to 10 mL of water sample and stirred for 1 minute. Fluoride concentration in the water samples was measured by UV-vis spectrophotometry (550 nm). Control experiments were performed with 1.25 mL of MO extract and 3.3 mA cm-2 current density, achieving 5 and 54% water defluoridation, respectively. Best experimental conditions with the batch MO/EC system with DI water produced > 90% fluoride removal using 1.25 mL of MO extract followed by EC (3.3 mA cm-2) with 1 cm electrode separation after 15 minutes. Considering these conditions, the design of a semi-continuous EC reactor for process upscaling was completed. Semi-continuous experiments with the MO/EC were performed using DI and tap water ̶ mimicking field conditions ̶ using 1 cm electrode separation, 1.25 mL of MO extract, and different current densities (J = 0.7-3.3 mA cm-2). Over 90% fluoride removal was achieved after 20 minutes, using 3.3 mA cm-2, in both DI and tap water. The MO/EC processes reduced fluoride concentration in water from 10 mg L-1 to below 1.5 mg L-1.

Oscar Rodriguez
Division de ciencias naturales y exactas, Guanajuato University, Guanajuato, GJ, Mexico
Guanajuato University Phd student, most Relevant Publications (2 publications) Total publications include 5 peer-reviewed journal articles and 1 book chapters (total citation > 97; h-index = 2). Rodríguez-Narváez, O. M., Serrano-Torres, O., Wrobel, K., Brillas, E., & Peralta-Hernandez, J. M. (2018). Production of free radicals by the Co2+/Oxone system to carry out diclofenac degradation in aqueous medium. Water Science and Technology, 78(10), 2131-2140. Rodriguez O.M., Peralta J.M., Goonetilleke A., Bandala E.R., 2017. Treatment technologies for emerging contaminants in water: A review. Chemical Engineering Journal 232, 361-380.
Oscar Rodriguez
School of liberal arts and science, Nevada State Collage
Nevada State Collage student
Braimah Apambire, Ph.D.
Division of Hydrologic Sciences, Desert Research Institute, Las Vegas, NV
Senior Director Ciwas Senior Assistant To The President
Erick Bandala
Desert Research Institute, Las Vegas, NV
Dr. Bandala performs research in water quality, water treatment and site restoration. His major experience is in developing countries on the generation and adaptation of technology for the generation of safe drinking water and proper sanitation. Development and implementation of cutting-edge analytical approach to chemical and microbiological water quality is also within his areas of expertise. Specific research interest includes solar driven Advanced Oxidation Processes, assessing the effect of Climate Change on water quality, developing adaptive technologies for sustainable water quality management, water chemistry, stormwater quality and treatment. Further areas of interest are: site restoration, non-conventional energy sources and the effect of water quality on human health. He holds a PH.D. degree in Engineering, M.Sc. degree in Organic Chemistry and B.Eng. degree in Chemical Engineering. Dr. Bandala is author or co-author of over 100 publications including 68 peer-reviewed papers (average impact factor 2.7, >1530 citations, h-index 22); 5 books, 28 book chapters and 60 works published in proceedings of international conferences. He also possess wide experience working as consultant working with different companies along North and South America.

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