Diminution of fluoride from groundwater using electrocoagulation: process optimization and role of arsenic interference
2020; Taylor & Francis; Volume: 195; Linguagem: Inglês
10.5004/dwt.2020.25925
ISSN1944-3994
AutoresVishakha Gilhotra, Rekha Yadav, Manpreet S. Bhatti,
Tópico(s)Water Quality Monitoring and Analysis
ResumoThe global incidence of high fluoride levels in groundwater and its role in various health complications necessitate the development of effective methods for its reduction to sustainable limits.Thus, this study proposed an electrocoagulation technology of fluoride removal from groundwater.The groundwater having 4 mg/L fluoride was collected at 70 m depth from Khalra village (31.3955°N, 74.6211°E), Tarn Taran district, Punjab, India.Analysis of fluoride concentration was carried out using ion-chromatography.The central composite design (CCD) was employed to optimize the effect of treatment time and current density.Permissible fluoride concentration (1.5 mg/L) in drinking water was achieved at pH 7.4, treatment time 37 min, and current density 40 A/m 2 using aluminum electrodes with 1.64 kWh/m 3 of energy consumption.The fluoride removal follows the pseudo-first-order kinetic model.Negative values of zeta potential indicated OH -surface exchange mechanism of fluoride.Boehmite AlO(OH) formation in sludge was confirmed using X-ray diffraction.Fourier-transform infrared spectroscopy and Raman spectroscopy of sludge revealed that complex formation between aluminum hydroxide/oxyhydroxide and fluoride is crucial for removal.
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