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1

Optimization of fluoride removal using ultrasonically improved electrochemically generated adsorbent: A Taguchi approach

Junghare Kunjan C., Kodape Shyam M., Rathod Ajit P., Lataye Dilip H.

Chemical and Process Engineering

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2022

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Vol. 43, nr 2

109–-117

EN

Ultrasonically improved electrochemically generated adsorbent (UEGA) has been synthesized and used for adsorption of fluoride ions from fluoride laden waste water. UEGA was prepared in two major steps, firstly electrochemically generated adsorbent (EGA) was prepared using electrolytic method followed by ultrasonication treatment. Ultrasonication causes size reduction which leads to increase in surface area viz. active site which helps to enhance attachment of negatively charged fluoride ion on positively changed UEGA from waste water. UEGA was prepared at three different amplitude i.e. 50, 70 and 90% respectively. Taguchi optimization for defluoridation was carried out considering operating parameters such as initial concentration; contact time; adsorbent dose; and temperature. The results obtained demonstrated that adsorption showed different fluoride removal at varying frequency. This study proved that varying percentage amplitude of ultrasonication significantly affects defluoridation efficiency.

2

A Novel Bio-Waste Incorporated Alginate Sorbent for De-Fluoridation of Water

Ayyappan C. S., Sreeja S., Bhalambaal V. M.

Journal of Ecological Engineering

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2015

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Vol. 16, nr 4

8--13

EN

This study evaluates the feasibility of using tamarind (Tamarindus indica) seed powder for de-fluoridation of fluoride contaminated water. Batch study confirmed that tamarind seeds in dry powder form could remove 87% of fluoride from water. This bio-sorbent can be used effectively in areas where fluoride concentrations are above the permissible limits of 1.5 mg·l-1 as per WHO Standard, 1984. Tamarind seed powder was incorporated in a matrix of sodium alginate and made into gel-beads. The beads were tested for de-fluoridation efficiency by conducting column studies. The effect of various factors, such as flow rate, retention time, and the number of runs on the efficacy of fluoride removal was also studied. The results revealed that flow rate did not seem to have much effect on the percentage fluoride removal but the fluoride concentration decreased drastically upon greater retention time and multiple runs.

3

Defluoridation of drinkable water Comparative study and parameter influent

Atia D., Hoggui A., Abdelhafidh B. A.

International Letters of Chemistry, Physics and Astronomy

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2013

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Vol. 10, iss. 1

48-60

EN

El-Oued is known for some diseases caused by fluoride concentration in drinkable water. To reduce it , a sample with the biggest content among many sources was chosen. A comparative study between the precipitation with calcium salts [Ca(OH)2, CaCl2, CaSO4] and the coagulation with the following salts [Al2(SO4)2•18H2O, Fe2(SO4)2•H2O, FeSO4] was done. Finely we studied the parameters influencing (the mass , pH, temperature) to choose the best conditions in order to get better reduction yield.

4

Decreasing fluoride by coagulation in drinkable water from Souf region of Algeria

Atia D., Hoggui A.

International Letters of Chemistry, Physics and Astronomy

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2013

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Vol. 5

57-65

EN

The drinkable water in Souf region at the south east of Algeria contains high quantity of fluoride which causes dental fluorosis. To reduce fluoride, we have chosen a sample with the biggest content of fluoride among many sources in order to coagulate it with Fe2(SO4)3źH2O. After that the parameters influencing (concentration, pH, temperature) are studied to choose the best conditions for better reduction.

5

Comparative study for the defluoridation of water by Coagulation

Atia D., Hoggui A., Abdelhafidh D. B. A.

International Letters of Chemistry, Physics and Astronomy

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2013

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Vol. 8, iss. 2

123-131

EN

El-Oued is known for some diseases caused by fluoride concentration in drinkable water. To reduce it, we have chosen a sample with the highest content of fluoride among many sources in order to coagulate it with Al2(SO4)3ź18H2O, Fe2(SO4)3źH2O and FeSO4. In order to get better reduction yield of fluoride, a study has been done on the influencing parameters (concentration, pH, temperature) to choose the best conditions. The remove of fluoride is favorable at low concentration of Al2(SO4)3, at room temperature and normal acidity.

6

Usuwanie fluoru z rozcieńczonych ścieków przy użyciu jonitów

Różycka D., Grobelny M.

Przemysł Chemiczny

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2005

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T. 84, nr 7

520-528

PL

Przedstawiono wyniki badań sorpcji fluoru z układów HF-H2O i H2SiF6-(H3PO4)-H2O na silnie zasadowych anionitach Amberlite IRA-900 i IRA910 oraz na słabo zasadowym IRA-93 w formie OH i SO4, w zakresie stężeń F 1–10 g/l i przepływie 5–20 ml/min. Regenerację żywicy prowadzono roztworami NaOH, NH3, (NH4)2SO4 i MgSO4. Otrzymane wyniki mogą stanowić podstawę do opracowania procesu oczyszczania wód ściekowych z produkcji kwasu fosforowego.

EN

Sorptions/desorptions of F-, HF2-, and SiF62- ions were run in aq. 1, 2.3 or 5.6 g/l. HF, aq. 1.5–5.5 g/l. H2SiF6, and H2SiF6 (6.8 or 10) –H3PO4 (7 g/l.)–H2O model solutions contg. some SO42-, on macroporous strongly (Amberlite IRA-900, 910) or weakly basic (IRA-93) OH- or SO4-form anion-exchange resins. These were well regenerated with aq. 1M NaOH, 1.5 or 2M NH4OH, 2M (NH4)2SO4 or 2M MgSO4. The OH-form IRA900 and IRA-93 reduced F from 1–10 down to <1 and 2–5 mg/l. and enabled F to be recovered as an aq. 25 NaF and a 40 g/l. NH4F, resp. From acidic solns., F was sorbed selectively as simple F- or as complex HF2- and SiF62- ions on strongly or weakly basic OH- and SO4-form resins down to ~5 and 50–100 mg/l., resp.; the SO4-form prevented SiF62- from hydrolyzing and depositing silica. (NH4)2SO 4 as desorbent, pH = 4, gave aq. 60–70 g F/l. (NH4)2SiF6 + (NH4)2SO4 solns. from which (NH4)2SiF6 was crystd.