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Reactive Dyes (R. Blue 19 and R. Red 120) Removal by a Natural Coagulant: Moringa Oleifera Publisher



Jafari A1 ; Mahvi AH1, 2, 3, 4
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, Lorestan University of Medical Sciences, Khorramabad, Iran
  2. 2. School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. National Institute of Health Research, Tehran University of Medical Sciences, Tehran, Iran

Source: Environmental Engineering and Management Journal Published:2015


Abstract

In this study, Moringa oleifera seed extract was applied as coagulant under different pH values (2.5 - 9.5), coagulant dosages (200-600 mg/L), initial dye concentrations (50-300 mg/L) and different settling times (0- 60 minutes) for R. Blue 19 and R. Red 120 dyes removal. Results revealed that with increase in pH (from 2.5 to 9.5), removal efficiency decreased from 95% to 87.3% for R. Blue 19 and from 97.2% to 62% for R. Red 120. By increasing coagulant dosage to 400 mg/L, removal efficiencies increased up to 93% for both dyes. Higher dosages (more than 400 mg/L) could not achieve more than 93% removal of the dyes. No suspension of formed flocs nor desorption of the dyes was observed after long settling times up to 24 hours. Moringa oleifera did not change the pH of solution through experiments. This natural coagulant revealed a high capacity in reactive dyes removal. © 2015, Gh. Asachi Technical University of Iasi. All Rights Reserved.
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