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-Chemical composition of limestone | Download Table
Download Table | -Chemical composition of limestone from publication: Fluoride removal from water using crushed limestone | An examination of defluoridation by industrial grade limestone indicated ...
Fluoride removal from groundwater by limestone …
The presence of PA increases the fluoride removal capacity of limestone to 1.10 mg/g compared to 0.39 mg/g reported in its absence. The changes in fluoride removal with variation in initial PA concentration, initial fluoride concentration and the final pH have been found to be statistically significant with p < 0.05.
Fluoride removal performance of phosphoric acid treated …
Fluoride in drinking water above permissible levels is responsible for dental and skeletal fluorosis. In this study, removal of fluoride ions from water using phosphoric acid treated lime was investigated in continuous and point-of-use system opera tions. In the continuous column operations, fluoride removal performance was investigated as a function of the fluoride …
(PDF) A study of suitability of limestone for fluoride removal …
The concentrations of the anions were varied in the range of 100–500 mg/L. Results have shown that the fluoride removal by these limestone – samples decreased in the order NO3 < Cl < SO24, with the increase in their concentration, with similar trend for all six samples [30]. There is a − low impact of NO− 3 on fluoride removal because ...
Low cost materials for fluoride removal from groundwater
Using limestone for fluoride removal not only addresses water quality issues but also reduces the environmental impact associated with chemical treatments. Limestone samples with a surface area greater than 2.55 m 2 /g, a total pore volume above 0.0094 cm³/g, and a density below 2.68 g/cm³ effectively reduce the fluoride concentration from 10 ...
Fluoride removal performance of phosphoric acid treated …
The presence of PA increases the fluoride removal capacity of limestone to 1.10 mg/g compared to 0.39 mg/g reported in its absence. The changes in fluoride removal with variation in initial PA concentration, initial fluoride concentration and the final pH have been found to be statistically significant with p < 0.05. The estimated recurring ...
Mechanism of fluoride removal by phosphoric acid-enhanced limestone
With a fourfold increase in the selective fluoride removal capacity of limestone, to 4.38 mg/g, phosphoric acid (PA)-enhanced limestone has been found to be a competent adsorbent material for ...
Field Trial of Fluoride Removal by Phosphoric Acid …
However, a fluoride removal method which is low-cost, safe, environment-friendly and can be used by a layman without requiring power is still not available. recently reWe ported a fluoride removal technique based on phosphoric acid-crushed limestone treatment (PACLT), which meets most of the above-mentioned requirements (Gogoi, 2015).
Overview of fluoride removal from water using separation …
The result obtained was 80.6% of fluoride removal at optimized parameters for an initial fluoride concentration of 50 mg/L. Langmuir isotherm was the best fit for fluoride removal with 16.67 mg/g of adsorption capacity (Srimurali and Karthikeyan, 2008). Jain and Jayaram examined hydroxide impregnated limestone (A1LS) for fluoride removal from ...
Limestone as a sustainable remediation option for water …
The rocks identified as KIT1 and KSS showed an increasing removal trend alongside decreasing particle size; the highest removal (~ 65%) was obtained with KIT1 from a solution that contained 4 mg/L fluoride and the smallest particle size (63–125 μm), while KSS only reached 22% removal under the same conditions.A final concentration (one that complied with …
Fluoride Removal by Calcite: Evidence for Fluorite …
In this study, fluoride removal by crushed limestone (99% pure calcite) was investigated by batch studies and surface-sensitive techniques from solutions with fluoride …
Development of a limestone-based ballasted material for …
The limestone specimen designated for the fabrication of the ballasted material was procured from a coal mining operation situated in the Western region of China. The chemical constitution of the limestone was scrutinized employing an X-ray fluorescence (XRF) spectrometer (ARL, Thermo Scientific, USA). ... The fluoride removal in the ballasted ...
Fluoride removal from water using crushed limestone
An examination of defluoridation by industrial grade limestone indicated that a combination of precipitation and adsorption of fluoride can be more effective for defluoridation of water. Pre-acidified fluoride water using two edible acids, viz., acetic acid (AA) and citric acid (CA) have been used for treatment by crushed limestone of diameter 3-4 mm to precipitate fluoride …
Fluoride removal from groundwater by limestone …
Fluoride removal from groundwater has been studied by addition of dilute phosphoric acid (PA) to the influent water before limestone treatment through laboratory plug-flow column experiments and bench-scale plug-flow pilot tests. In this PA-enhanced limestone defluoridation (PAELD) technique, fluoride is removed from 0.526 mM to 0.50–52.60 μM in 3 h …
Fluoride removal from groundwater by limestone treatment …
In this PA-enhanced limestone defluoridation (PAELD) technique, fluoride is removed from 0.526 mM to 0.50–52.60 μM in 3 h with near neutral final pH. The presence of …
Review of fluoride removal from water environment by adsorption
Ezzeddine et al. [13] investigated the fluoride removal from aluminum fluoride manufacturing wastewater precipitation-neutralization using lime or limestone. The effects of experimental conditions such as lime or limestone dosage, initial fluoride concentration and initial pH on fluoride removal efficiency and final pH were evaluated.
Insights of using microbial material in fluoride removal from
Therefore, developing efficient fluoride removal technologies is crucial. This review summarizes the progress made in using microbial materials to remove fluoride from wastewater, covering strategies that involve pure cultures of bacteria, fungi, and algae, as well as modified microbial materials and bioreactors. ...
Fluoride removal from water using crushed limestone
Fluoride removal from water using crushed limestone Indian Journal of Chemical Technology Vol.17, March 2010, pp. 120-125 Fluoride removal from water using crushed limestone Suresh K Nath & Robin K Dutta* Department of Chemical Sciences, Tezpur University, Napaam, Tezpur 784 028, India Email: [email protected], [email protected]
A study of suitability of limestone for fluoride removal by …
Fluoride removal quantitatively related with surface area, porosity and density of limestone. Fe 2 O 3 and Al 2 O 3 impurities make the pH of treated water more acceptable for drinking. The results may help in screening limestone for use in fluoride removal by PACLT.
Limestone as a sustainable remediation option for water …
For limestone, fluoride removal reaches 65% and fluoride decreases from 4 mg/L to 1.4 mg/L with 0.65 g/L rock (Labastida et al., 2017). Compared with the fluoride removal ability and cost of these calcium-containing materials (Table 1), FGD gypsum performs attractively as an industrial by-product and may be regarded as a cost-effective material ...
Elimination of Fluoride from Water using Limestone …
] have already been used for fluoride removal (Nath and Dutta 2013). Treatment of fluoride water by limestone has been proven to be a good method for fluoride removal. It takes about 20 hrs of residential time to remove fluoride without adding any acid to the water (Reardon and Wang 2000). After addition of the acid, the time was reduced to
Fluoride Removal from Contaminated Water by …
This fluoride removal efficiency was higher than with the limestone reactor of Reardon and Wang (by a further reduction of 1.19 mg/L fluoride in total) yet still lower than the predicted efficiency. One important reason of the lower fluoride removal efficiency than with prediction is that the citrate ions suppressed the precipitation of calcite.
(PDF) Fluoride removal from groundwater by …
Pre-acidified fluoride water using two edible acids, viz., acetic acid (AA) and citric acid (CA) have been used for treatment by crushed limestone of diameter 3-4 mm to precipitate fluoride as CaF 2 in addition to adsorption of fluoride on limestone.
Fluoride removal from water by lime-sludge …
The influence of coexisting anions on fluoride removal was low for all limestone samples and followed the order sulfate > chloride > nitrate. The surface area and total pore volume above 2.55 m² ...
Fluoride removal from water using crushed limestone
limestone lowers the F-concentration from its initial value of 10 mg/L to below 2 mg/L, which is much better compared to the fluoride removal by limestone filtration alone 14. The ability of the crushed limestone chips to remove F-increased with increasing the acid concentration. However, the removal became poorer
Fluoride removal from water using crushed …
Pre-acidified fluoride water using two edible acids, viz., acetic acid (AA) and citric acid (CA) have been used for treatment by crushed limestone of diameter 3-4 mm to precipitate fluoride...
A study of suitability of limestone for fluoride removal by …
The influence of coexisting anions on fluoride removal was low for all limestone samples and followed the order sulfate > chloride > nitrate. The surface area and total pore volume above 2.55 m² ...
Fluoride removal from groundwater by limestone …
Fluoride removal from groundwater has been studied by addition of dilute phosphoric acid (PA) to the influent water before limestone treatment through laboratory plug-flow column experiments and bench-scale plug-flow pilot tests. In this PA-enhanced limestone defluoridation (PAELD) technique, fluoride is removed from 0.526 mM to 0.50–52.60 μM in 3 h with near neutral final pH.
Fluoride Removal by Calcite: Evidence for Fluorite …
Fluoride contamination of groundwater, both anthropogenic and natural, is a major problem worldwide. In this study, fluoride removal by crushed limestone (99% pure calcite) was investigated by batch studies and surface-sensitive techniques from solutions with fluoride concentra tions from 150 μmol/L (3 mg/L) to 110 mM (∼2100 mg/L).
Fluoride removal from water using crushed limestone
NATH & DUTTA: FLUORIDE REMOVAL FROM WATER USING CRUSHED LIMESTONE 121 low cost method of fluoride removal which uses lime and alum also suffers from some disadvantages, viz., it adds toxic ...
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