limestone calcite defluoridaton

  • Calcium Oxide (CaO)

    Calcium oxide can be produced by thermal decomposition of materials like limestone or seashells that contain calcium carbonate (CaCO 3; mineral calcite) in a lime kiln. The process that is used to prepare burnt lime is known as calcination.

  • Assessing the Effectiveness of Limestone from Oterkpolu …

    Mineralogically, (PTS and XRD analysis), the limestone sample is made up of 96% calcite and 4% quartz (PTS) and 83% calcite, 11% serandite and 6% silicon oxide (XRD). This indicates high calcite content in the sample which suggests that, it is an effective material for fluoride adsorption.

  • Defluoridation of calcium-rich groundwater using iron …

    In this study, the defluoridation potential of FeONs in both calcium-free and -rich groundwater was investigated. The study mainly focused on the different removal mechanisms of fluoride and calcium, adsorption isotherms, and kinetic studies of fluoride and calcium, using single- and multi- …

  • Lesson 9: Fluoridation

    Limestone (calcite) can remove the fluoride from water through a combination of adsorption and precipitation processes and magnesium oxide also acts as the precipitating agent. Aluminum salts (i.e. Alum) and lime are some of the frequently used materials in defluoridation by precipitation technique.

  • A Limestone Reactor for Fluoride Removal from …

     · A two-column limestone reactor has been designed to reduce fluoride concentrations from wastewaters to below the maximum contaminant level (MCL limit) of 4 mg/L. The reactor functions by forcing calcite (CaCO 3) to dissolve and fluorite (CaF 2) to …

  • A Fixed Bed Granular Calcite Column to Treat …

    Continuous experiment using a packed column with granular calcite was performed to observe the successive fluoride removal capacity of calcite. The real HF wastewater concentration of 1,055 mg/L was reduced to the level of less than 15 mg/L, and it was further reduced as …

  • Enhancement of limestone defluoridation of water by …

    Limestone defluoridation by fixed bed reactor has been studied with water pre-acidified with edible organic acids, viz. acetic acid (AA) and citric acid (CA). The study has been carried out by varying acid concentration, contact time (t), number of repeated use of the same limestone bed (n), and chip size of the crushed limestone using fixed fluoride concentration of 10 mg/L in distilled water ...

  • Nanoparticulate Apatite Coated Calcite/Limestone Filter …

    The FTIR spectra of phosphate-coated calcite/limestone exhibited strong bands in the regions of 1000-1100 cm −1 and 500-600 cm −1, which correspond to the v 3 and v 4 (asymmetric stretching and bending modes, respectively) vibrations of the PO 4 3− moiety. moiety.

  • Lesson 9: Fluoridation

    Limestone (calcite) can remove the fluoride from water through a combination of adsorption and precipitation processes and magnesium oxide also acts as the precipitating agent. Aluminum salts (i.e. Alum) and lime are some of the frequently used materials in defluoridation by precipitation technique.

  • REMOVAL OF FLUORIDE FROM WASTEWATER BY CALCINED …

    Other researchers utilised calcite to remove fluoride ion from industrial wastewater containing HF [23, 24]. Gogoi and Dutta [25] revealed that the addition of phosphoric acid to limestone enhanced the removal of fluoride by increasing the removal capacity to

  • How to Remove Fluoride from Drinking Water

    Recently limestone and heat-treated soil were tried for fluoride removal. Limestone was used in a two-column continuous flow system (limestone reactor) to reduce fluoride concentrations from wastewaters to below the MCL (Maximum contaminant level) of 4 mg/L. Calcite was forced to dissolve and fluorite to precipitate in the first column.

  • Fluoride removal from water using crushed limestone

    Keywords: Defluoridaton, Limestone, Calcite, Acetic acid, Citric acid Fluoride contamination of groundwater is a serious problem in several countries spread throughout the world as ingestion of excess fluoride, most commonly, through drinking Mainly two factors ...

  • (PDF) Fluoride removal from water using crushed limestone

    Keywords: Defluoridaton, Limestone, Calcite, Acetic acid, Citric acid Fluoride contamination o f groundwater is a serious problem in several countries spread throug hout the world as ...

  • Assessing the Effectiveness of Limestone from Oterkpolu …

    Assessing the Effectiveness of Limestone from Oterkpolu Area in the Eastern region of Ghana as a Suitable Adsorbent for Water Defluoridation Login UGSpace Home → Theses → Masters → College of Basic and Applied Sciences → School of Nuclear and → ...

  • Defluoridation of wastewaters using HAP-coated-limestone

    Defluoridation of wastewaters using HAP-coated-limestone Feigao Xu, Changyi Jiang & Dan Li To cite ... from Nanjing Dou village is composed of calcite, with trace amounts of quartz, alumina, and ...

  • Enhancement of limestone defluoridation of water by …

    Limestone defluoridation by fixed bed reactor has been studied with water pre-acidified with edible organic acids, viz. acetic acid (AA) and citric acid (CA). The study has been carried out by varying acid concentration, contact time (t), number of repeated use of the same limestone bed (n), and chip size of the crushed limestone using fixed fluoride concentration of 10 mg/L in distilled water ...

  • Column evaluation of a water defluoridation technique based on …

    preferred for defluoridation of water because of its simplicity and cost effectiveness. Limestone (calcite)14-17, gypsum18, raw bauxite 19, magnesite, pumice stone19, alumina20, zeolites21, clays22, charcoal23, rare earth oxides2425, 6,14,26

  • Enhancement effect of phosphate and silicate on water …

    Research work on removal of fluoride from water, referred to as water defluoridation, has resulted into the development of a number of technologies over the years but they suffer from either cost or efficiency drawbacks. In this work, enhancement effects of phosphate ...

  • Limestone

    Limestone is a common type of carbonate sedimentary rock is composed mostly of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3).Limestone forms when these minerals precipitate out of water containing dissolved calcium. out …

  • Nanoparticulate Apatite Coated Calcite/Limestone Filter …

    The FTIR spectra of phosphate-coated calcite/limestone exhibited strong bands in the regions of 1000-1100 cm −1 and 500-600 cm −1, which correspond to the v 3 and v 4 (asymmetric stretching and bending modes, respectively) vibrations of the PO 4 3− moiety. moiety.

  • (PDF) A critical study on efficiency of different materials for …

    Crushed limestone (99% pure calcite) used as an adsorbent for fluoride removal by batch studies and surface-sensitive techniques from solutions with high fluoride concentration ranging from 3 to~2100 mg/L. With different techniques, such as atomic force ...

  • Enhancement of Limestone Defluoridation of Water by …

    Limestone defluoridation by fixed bed reactor has been studied with water pre‐acidified with edible organic acids, viz. acetic acid (AA) and citric acid (CA). The study has been carried out by varying acid concentration, contact time (t), number of repeated use of the same limestone bed (n), and chip size of the crushed limestone using fixed fluoride concentration of 10 mg/L in distilled ...

  • Effect of acid on morphology of calcite during acid …

    Fluoride removal from water by lime materials is a promising defluoridation process. Acid enhanced limestone defluoridation (AELD) technique involves precipitation of CaF 2 as well as adsorption of fluoride on the surface of limestone which is capable of reducing fluoride concentration to below the WHO guideline value of 1.5 mg/L. Acids such as acetic acid and citric acid are added to the ...

  • 10.1016/j.jenvman.2015.01.031 | DeepDyve

    Although the acid-enhanced limestone defluoridation (AELD) with these acids is quite cost-effective, the overall capacity of limestone is poor ( Nath and Dutta, 2010, 2012 ). However, these works showed a role of the anion of the acid in fluoride removal and residual Ca 2+ concentration.

  • Influence of retardation and acceleration of setting time on …

    Fluoride ion (F−) removal technologies from water (defluoridation) suffer from cost and/or efficiency drawbacks. The hugely available low-cost calcined gypsum (plaster of paris) represents a material of choice, especially in the developing countries. Partially soluble calcined gypsum introduces Ca2+ and SO4 2− into the water. In this work, the influence of tartaric acid, paracetamol ...

  • Kinetics of fluoride adsorption onto native and Mg(OH) 2 …

    The adsorption kinetics of fluoride onto limestone (LS) and Mg(OH)2-amended LS were investigated using batch adsorption technique. Data were best fitted to second-order and Elovich models. The Mg(OH)2-ameded LS showed substantial increases in F− adsorption relative to native LS. Similarity of ionic radii and charge of both F− and OH− were hypothesized to be the major cause of such ...

  • (PDF) Enhancement of Limestone Defluoridation of Water …

    Limestone or calcite is one of E-mail: [email protected] the potential materials for removal of fluoride [7, 15, 19, 20] which ß 2010 WILEY-VCH Verlag & Co. KGaA Therefore a defluoridation method using this low cost acceptable limit.

  • efficacy of limestone on fluoride removal

    A study of suitability of limestone for fluoride removal 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 m 2 /g and 0.0094 cm 3 /g respectively, and density below 2.68 g/cm 3 are required for a limestone sample for defluoridation from 10 mg/L [F] 0 to ...

  • Novel materials for defluoridation in India: A systematic …

     · Recent advances in defluoridation of water in India are clustered around innovative laboratory experiments done for novel effective material. Chemicals such as alumina, limestone, and alum are used for defluoridation of water since early days.

  • Influence of retardation and acceleration of setting time on …

    Fluoride ion (F−) removal technologies from water (defluoridation) suffer from cost and/or efficiency drawbacks. The hugely available low-cost calcined gypsum (plaster of paris) represents a material of choice, especially in the developing countries. Partially soluble calcined gypsum introduces Ca2+ and SO4 2− into the water. In this work, the influence of tartaric acid, paracetamol ...

  • Utilizing Calcite or Limestone Contactors for …

    This crushed limestone, or calcite, is utilized as a fixed bed of particles in a pressure vessel – a calcite contactor. Calcite contactors have seen little use in the United States in the past but have recently gained popularity as a cost-effective and easy to use option for remineralization.

  • Lesson 9: Fluoridation

    Limestone (calcite) can remove the fluoride from water through a combination of adsorption and precipitation processes and magnesium oxide also acts as the precipitating agent. Aluminum salts (i.e. Alum) and lime are some of the frequently used materials in defluoridation by precipitation technique.

  • US6929759B2

    The present invention in a preferred form is a novel composition of matter and a method of use, which includes at least a polyaluminum compound in an aqueous solution for use as a coagulant and/or flocculant. The composition of matter additionally includes ...

  • NOPR: Fluoride removal from water using crushed limestone

    Defluoridaton;Limestone;Calcite;Acetic acid;Citric acid Issue Date: Mar-2010 Publisher: CSIR Abstract: An examination of defluoridation by industrial grade limestone indicated that a combination of precipitation and adsorption of fluoride can be more effective for ...

  • Fluoride removal from water by lime-sludge waste

    S.K. Nath, R.K. Dutta, Enhancement of limestone defluoridation of water by acetic and citric acids in fixed bed reactor, CLEAN Soil Air Water, 38 (2010) 614–622. S.K. Nath, R.K. Dutta, Acid-enhanced limestone defluoridation in column reactor using

  • Acid-enhanced limestone defluoridation in column reactor …

     · Acid enhanced limestone defluoridation of water has been studied in a crushed limestone column reactor using oxalic acid (OA). The defluoridation has been studied with varying initial fluoride concentrations of 5, 10, 15 and 20 mg/L and acid concentrations of 0.01, 0.05 and 0.1 M.M.

  • Novel Apatite-Based Sorbent for Defluoridation: …

     · Our experiments with granular limestone (38–63, 125–500 μm) and dissolved PO 4 3– (0.5–5.3 mM) as a function of pH (6–8) and temperature (25–80 C) indicated rapid formation of nano- to micrometer sized HA crystals on granular limestone with the maximum

  • Fluoride removal from water by lime-sludge waste

    S.K. Nath, R.K. Dutta, Enhancement of limestone defluoridation of water by acetic and citric acids in fixed bed reactor, CLEAN Soil Air Water, 38 (2010) 614–622. S.K. Nath, R.K. Dutta, Acid-enhanced limestone defluoridation in column reactor using

  • Enhancement effect of phosphate and silicate on water …

    Research work on removal of fluoride from water, referred to as water defluoridation, has resulted into the development of a number of technologies over the years but they suffer from either cost or efficiency drawbacks. In this work, enhancement effects of phosphate ...

  • Rapid defluoridation of drinking water by calcium …

    For defluoridation of DW, adsorption is considered to be an efficient option compared to other technologies owing to simplicity of steps, operation, and maintenance cost (Bhatnagar et …

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