• Fluoride removal from groundwater by limestone

    With consistent removal of fluoride from any initial concentration to a desired concentration, a recurring cost of only Rs 0005/l of water and an estimated life of the limestone bed of about 50

  • 预计阅读时间:8 分钟
  • A critical study on efficiency of different materials for

    Fluoride is a persistent and nonbiodegradable pollutant that accumulates in soil, plants, wildlife and in human beings Therefore, knowledge of its removal, using best technique with optimum efficiency is needed The present survey highlights on efficacy of different materials for the removal of fluoride from water The most important results of extensive studies on various key factors (pH

  • Cited by: 135
  • Fluoride removal from water by adsorption—A review

    Highlights Fluoride removal from water using ‘adsorption’ process has been reviewed A list of ∼ 100 adsorbents has been presented along with their adsorption capacities The influence of various parameters on fluoride removal has also been presented Recently developed novel adsorbents for defluoridation have been discussed

  • Cited by: 945
  • Effects of the fluoride on the central nervous system

    Effects of experimental conditions such as lime or limestone dose, clay mass, initial fluoride concentration and initial pH on the fluoride removal efficiency and the final pH have been evaluated

  • 预计阅读时间:10 分钟
  • Review of fluoride removal from drinking water

    Fluoride in drinking water has a profound effect on teeth and bones Fluoride displaces hydroxide ions from hydroxyapatite, Ca 5 (PO 4) 3 OH, the principal mineral constituent of teeth (in particular the enamel) and bones, to form the harder and tougher fluoroapatite, Ca 5 (PO 4) 3 F Up to a small level this strengthens the enamel However, fluoroapatite is an order of magnitude less soluble

  • Cited by: 819
  • Removal of fluoride ions using cuttlefish bones

    The fluoride removal increases with the amount of cuttlefish bone used According to the figure, when the adsorbent amount increased from 5 to 15 g L −1, the fluoride removal increased from 40% to 85%, respectively This rise was due to the larger surface available to sorption which promoted the sorption of fluoride

  • Cited by: 77
  • Technologies for Decentralized Fluoride Removal:

    Boruff [] was among the first researchers who developed a methodology for the removal of excess fluoride from drinking water [2,3,4,19]Among other materials, aluminum

  • Cited by: 27
  • A review of fluoride in african groundwater and local

    Fluoride (F −) is the anion of the halogen element, fluorineFluorine ranks 13th, in the abundance of the elements and constitutes approximately 01% of the Earth's crust (Amini et al, 2008, Johnson and Bretzler, 2015)Fluorine is the most electronegative element and is extremely reactive (Pauling, 1960)Therefore, it rarely occurs naturally as F 2

  • Cited by: 80
  • Fluoride Action Network | Broadening Public

    Friday, May 7th, 2021 2 Injured in Hydrogen Fluoride Leak at Marathon’s Galveston Bay Refinery Marathon Petroleum Corp is investigating what caused a toxic chemical release that injured two workers on May 4 at a Texas City oil refinery, a spokesman said, as

  • Asian Journal of Chemistry; Vol 30, No 4 (2018), 753758

    some other adsorbents such as limestone (LS) and aluminium hydroxide impregnated limestone (AILS) can also be used for removal of fluoride in batch mode It has been observed experimentally that the maximum fluoride removal capacity of limestone (LS) and aluminium hydroxide impregnated limestone (AILS) is 4310 and 8403 mg/g, respectively [21]

  • (PDF) Application of nanostructured materials in

    Nalgonda Technique is an economical and simple method for fluoride removal which involves addition of aluminium salts, lime and bleaching powder followed by rapid mixing, flocculation, sedimentation, filtration and disinfection (Nawalakhe et al, 1975) Aluminium salt is only responsible for removal of fluoride

  • A critical study on efficiency of different materials for

    The present survey highlights on efficacy of different materials for the removal of fluoride from water The most important results of extensive studies on various key factors (pH, agitation time, initial fluoride concentration, temperature, particle size, surface area, presence and nature of counter ions and solvent dose) fluctuate fluoride

  • (PDF) A critical study on efficiency of different

    A critical study on efficiency of different materials for fluoride removal from aqueous media Dian Ekawati Download PDF Download Full PDF Package This paper A short summary of this paper 37 Full PDFs related to this paper READ PAPER

  • Review of fluoride removal from water by adsorption

    A number of investigators have also studied the efficacy of synthetic HAps in fluoride removal from water Larsen & Pearce (2002), for instance, developed a fluoride adsorbent by reacting calcite and brushite, CaHPO 42H 2 O Between 705 and 988% fluoride adsorption could be achieved from distilled water containing 5–20 mg/L fluoride while

  • Fluoride Action Network | Fluorine recovery in the

    The neutralization of fluosilicic acid with limestone or milk of lime is the main principle of fluorspar production (182187) Normally, the calcium fluoride and silica are precipitated together but, under certain process conditions, silica remains metastable in the solution

  • Study the Removal of Fluoride from Aqueous Medium

    HNO 3 or 01 N NaOH The percentage of fluoride ions removed decreases with increase in pH for all three adsorbents At a pH of 2 to 4, which gives the maximum fluoride removal for both cases of metal oxide based fiber, about 97% and 92% of fluoride ions are removed for IBNC and TBNC, respectively ()The effect of adsorbent dosage on the removal of fluoride ions was examined by

  • Technical Articles describing the basics of pH

    Case Studies Fluoride Reduction This case study examines a duplex fluoride reduction system designed to remove fluorides from a semiconductor fab wastewater effluent stream Fluorides are reduced from very high levels to as low as 2ppm HF Neutralization and Fluoride Removal System This case study examines a 200 GPM continuous flow through fluoride removal and pH neutralization system

  • Water Handbook Gas Cleaning Systems | SUEZ

    The formation of calcium sulfate, calcium fluoride, and silicate deposits is not significantly influenced by pH, so even lowpH systems can experience heavy deposition Many plastic internal parts (such as mist eliminators, Figures 387 and 388 ) cannot withstand even light accumulations of deposits, due to their structural strength limitations

  • Sodium fluoride | NaF PubChem

    Sodium Fluoride is an inorganic salt of fluoride used topically or in municipal water fluoridation systems to prevent dental caries Fluoride appears to bind to calcium ions in the hydroxyapatite of surface tooth enamel, preventing corrosion of tooth enamel by acids This agent may also inhibit acid production by commensal oral bacteria (NCI04)

  • Fluoride Action Network | Fluorine recovery in the

    The neutralization of fluosilicic acid with limestone or milk of lime is the main principle of fluorspar production (182187) Normally, the calcium fluoride and silica are precipitated together but, under certain process conditions, silica remains metastable in the solution

  • Review of fluoride removal from water by adsorption

    A number of investigators have also studied the efficacy of synthetic HAps in fluoride removal from water Larsen & Pearce (2002), for instance, developed a fluoride adsorbent by reacting calcite and brushite, CaHPO 42H 2 O Between 705 and 988% fluoride adsorption could be achieved from distilled water containing 5–20 mg/L fluoride while

  • Technical Articles describing the basics of pH

    Case Studies Fluoride Reduction This case study examines a duplex fluoride reduction system designed to remove fluorides from a semiconductor fab wastewater effluent stream Fluorides are reduced from very high levels to as low as 2ppm HF Neutralization and Fluoride Removal System This case study examines a 200 GPM continuous flow through fluoride removal and pH neutralization system

  • Effects of CoalAsh Leachate on Ground Water Quality

    vertical profile of the substratum at plant l's monitoring well locations li clay/silt limestone 108 l4 clay/silt gravelly sand gravelly clay vft; 98 142 clay/silt limestone 137 l5 clay/silt gravelly sand clay/silt limestone 78 108 163 l3 clay/silt gravelly clay limestone 0

  • Sodium fluoride | NaF PubChem

    Sodium Fluoride is an inorganic salt of fluoride used topically or in municipal water fluoridation systems to prevent dental caries Fluoride appears to bind to calcium ions in the hydroxyapatite of surface tooth enamel, preventing corrosion of tooth enamel by acids This agent may also inhibit acid production by commensal oral bacteria (NCI04)

  • Per‐ and polyfluoroalkyl substances thermal

    Introduction Per ‐ and polyfluoroalkyl substances (PFAS) encompass a wide range of compounds, numbering in the thousands, that have been used in a large variety of consumer and industrial products and, consequently, are widely distributed in the environment (Buck et al, 2011) As a result of the persistence and toxicity of these compounds, the Stockholm Convention, which manages

  • 浙江农林大学学报

    Result The chemical analysis and testing of fluoride bamboo showed obvious changes in lignin Fourier transformed infrared spectra demonstrated that the new peaks at 739 cm 1 were CF (carbonfluorine) monosubstituted bonds; whereas, concentrated sulfuric acid pretreated fluorinated bamboo showed double CF peaks at 878 and 1 088 cm 1 caused by the polysubstitution of CF bonds on the

  • 3: Technologies for the Small System | Safe Water

    The removal efficiencies for organic compounds range from no removal to better than 99 percent removal Humic materials, particulate matter, microorganisms, and viruses are generally removed in the process, but the bypass water will add microbiological contaminants to the treated water when the two are mixed to reduce corrosiveness

  • MTech Thesis IIT Kanpur

    Comparison of Different Sorbents for Fluoride Removal from Synthetic Groundwater 2015 Sharma, Mukesh; Russell, Armistead G Gupta, Tarun Atmospheric black carbon: national emission inventory, uncertainty analyses and WRFChem modelling in Ganga basin 2014 Bhole, Shrikant Anil Singh, Abhas

  • GRANULAR ACTIVATED CARBON (GAC) FACT SHEET

    Activated Carbon for Radon Removal Radon (Symbol Rn) is a radioactive gas that does not impart taste or odor to water It stems from the natural decay of uranium to radium and radium to radon (radon is known to increase the risk of lung cancer when inhaled) Radon is the second leading cause of lung cancer in the US today To a lesser

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