Fluoride removal from water without using electricity

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We are interested in technology for removing fluoride from water through non-electrical methods. In simple word looking for Fluoride removal technology using no electricity but using some other method. Which can also remove other health hazardous salts by electrolysis via a solar operated system. 

Does anyone have some novelty technology for this issue? We can go for collaborations/ NDA/MOU if the technology is foolproof. Write me in detail explaining the feasibility of your technology.

Thanks.

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13 Answers

  1. We have developped a new technology that does not use energy, chemicals and reduce fluorine under any condition (pH, presence of any other elements, any level of fluorine)  Check for further information at hindrop.com or write an e-mail

  2. We have a Bioflocculant which effectively removes fluroides without using any electricity. It is simple to dose the Agent, leave without agitating for a few minutes and use teh water. It can remove fluorides by more than 95%. And it is a proven solution.

     

    Please feel free to write to me if you are interested sir.

    Regards

    Sarath

    vegesnabio@gmail.com 

    1 Comment

  3. Hi Chandrasekaran.

    It is not a 'siphon', but a break pressure 'anti-siphon'. Actually just a T-piece at top of inlet pipe (at top of vessel) with an additional piece of pipe sticking up in the air (about 100 cm depending on water pressure). The 'vent'  pipe will sometimes gulp a bit of water out but mostly it will be sucking air into the vessel, thus creating the violent mixing when bobbles are floating from bottom of tank to surface.

    Sorry for the misguidance.

    Erik

  4. Hi Chandrasekaran.

    I'm Erik from Denmark. I worked with low-tech fluoride removal early 90'es while a student and after graduation.

    I don't see below the Nalgonda Technique (precipitation with Aluminum Sulphate + Lime). The optimum pH removal of Fluoride is at 6.5 during coagulation. Take care of the pH adjustment capacity of the Lime being reduced during storage, resulting in too low pH at coagulation and lower fluoride removal.

    If using pressurized water no paddle needed in batch mixing vessel, as the movement of water coming into the vessel from bottom (e.g. 1500 L) will stir the water for first mixing line (added when 50% full), then assist coagulation and flocculation after adding ALUM (added when 75% full). The flocculation will continue until 100% full and afterwards for some time, while settlement start. After 8-10 hours (overnight) there is a clear and fluoride reduced layer above the settled sludge (10-15% of total volume going to waste). Actually the water inlet at the bottom must be build with a siphon to prevent backflow into the feeding pipe. The siphon will during the filling suck air into the pipe resulting in bobbles in the vessel, creating violent mixing.

    For Bone Char the apatite crystal structure is destroyed with too high temperature, thus loosing the ability to absorb (ion exchange) the fluoride. The best Bone Char is produce at about 400 degrees Celsius and long time burning to remove organics without destroying the apatite crystal structure. The product after burning will be light grey in color. To be crushed to mm size granules. The longer the filter the more efficient before break through. Ideally 2 filters in series will assist to exhaust the capacity in the first filter while still removing fluoride in the second filter. Then move up the 2nd filter to be the first and insert a newly filled filter at no. 2.

    Prem Baboo worte:

    Bone Char

    The uptake of fluoride onto the surface of bone was one of the early methods suggested for defluoridation of water supplies. The process was reportedly one of the ion exchange in which carbonate radical of the apatite comprising bone, Ca(PO4)6.CaCO3, was replaced by fluoride to form an insoluble fluorapatite. Bone char produced by carbonizing bone at temperature of 1100-1600ºC had superior qualities than those of unprocessed bone and hence replaced bone as defluoridating agent averted in this method.

  8. Dear Chardrasekaran

    Water Filters: One way of avoiding the fluoride from tap water is to purchase a water filter. Not all water filters, however, remove fluoride. The three types of filters that can remove fluoride are reverse osmosis, deionizers (which use ion-exchange resins), and activated alumina.

    The technique of Fluoride removing is a combination of several unit operations and the process involves rapid mixing, chemical interaction, flocculation, sedimentation, filtration, disinfection and sludge concentration to recover waters and aluminium salts. Alum (hydrated aluminium salts) - a coagulant commonly used for water treatment is used to flocculate fluoride ions in the water. Since the process is best carried out under alkaline conditions, lime is added. For the disinfection purpose bleaching powder is added. After thorough stirring, the chemical elements coagulate into flocs and settle down in the bottom. The reaction occurs through the following equations

    2 Al2 (SO4)3. 18H2 O + NaF + 9Na2CO3 → [5Al(OH)3.Al(OH)2F] + 9Na2SO4+NaHCO3 + 8 CO2 + 45 H2O 3 Al2 (SO4)3 . 18H2 O + NaF +17NaHCO3 → [5Al (OH) 3. A l (OH)2F] + 9Na2SO4+ 17 CO2 + 18 H2O

    Precipitation methods

    Method involving the addition in sequence, of an alkali, chlorine and aluminium sulphate or aluminium chloride or both was developed. It is cheap and is used extensively in many countries.

    Though lime softening accomplishes fluoride removal, its high initial cost, large dosage and alkaline pH of the treated water renders it unsuitable for field application. Large dosage and alkaline pH of the treated water renders it unsuitable for field application.

    Activated alumina Defluoridation Filter

    Activated alumina is a granular, highly porous material consisting essentially of aluminum trihydrate. It is widely used activated alumina for fluoride uptake. An initial concentration of 5 mg/L was effectively brought down to 1.4 mg/L before regeneration and to 0.5 mg/L on regeneration with 2N HCl. The bed was regenerated with a solution of 2% Na OH,5% NaCl,2N HCl,5% NaCl and 2N HCl. The removal capacity of the medium was found to be about 800 mg/L of fluorid e/L of Alumina.

    Activated Alumina can be regenerated with HCl, H2SO4, Alum or NaOH. The use of NaOH needs to be followed by a neutralization to remove residual NaOH from the bed. Fluoride removal by activated alumina is strongly pH dependent.

    The ability of activated alumina to remove fluoride depends on other aspects of the chemistry of water as well. Such factors as hardness, silica and boron, etc., if present in water will interfere with fluoride removal and reduce the efficiency of the system.

    The use of activated alumina in a continuous flow fluidized system is an economical and efficient method. The process could reduce the fluoride levels down to 0.1 mg/L.

    Bone Char

    The uptake of fluoride onto the surface of bone was one of the early methods suggested for defluoridation of water supplies. The process was reportedly one of the ion exchange in which carbonate radical of the apatite comprising bone, Ca(PO4)6.CaCO3, was replaced by fluoride to form an insoluble fluorapatite. Bone char produced by carbonizing bone at temperature of 1100-1600ºC had superior qualities than those of unprocessed bone and hence replaced bone as defluoridating agent averted in this method.

    Contact Precipitation

    It is a technique by which fluoride is removed from the water through the addition of calcium and phosphate compounds and then bringing the water in contact with an already saturated bone charcoal medium. 

    Activated Carbon

    High Fluoride removal capacities of various types of activated carbons had been reported.Alkali digested alum impregnated paddy husk carbon was an efficient defluoridating agent.

    Lime

    The fluorides in waters containing Magnesium, when treated with lime, are adsorbed on Magnesium hydroxide flocs enabling fluoride removal.In this case the water must be treated to a caustic alkalinity of 30 mg fluoride/L, a pH of 10.5 or above and as such recarbonation is necessary.Magnesia and calcined magnesite have also been used for fluoride removal from water and fluoride removal capacity was reported to be better at high temperature

    Ion Exchange Resins

    Strong base exchange resins remove fluorides either on hydroxyl cycle or chloride cycle along with anions. Since the proportional quantity of fluoride as compared to other anions is very small, the effective capacity of such resins works out quite low. Some inorganic ion exchangers.

    Regards,

    Prem Baboo

    1 Comment

  10. The magnesium oxide (MgO) used in the Prilly Pure Water bags actual places a positive charge in the water. This electromagnetic charge shatters the magnetic bond that holds together any  Totally Dissolved Solids (TDS), and heavy metals like lead, copper, zinc, chlorine, fluoride and also the Emerging Contaminants such as pesticides and pharmaceuticals. These contaminants and pollutants are then gassed out of the container. 
    This is a living water. The pH of the water is raised to 8.7, high alkaline, high oxygen and the water is structured "thin" so as to more readily penetrate the cell membrane and to deliver oxygen, nutrients and pure water and flush out your toxins. 
    As to hydration, due to it being "thinner" water, 3 glasses of Prilly Pure Water is equal to 1 gallon of tap water.
    The MgO has been processed at 700 degrees Fahrenheit and made to be more ceramic like a marble in water that never dissolves, never wears out and never needs to be replaced. 
    No expensive equipment, No costly replacement filters, No electricity, and No more bottled water. 
    This a 1 time investment of only $40 for Water Freedom, and the Final Barrier between Invisible Bad Water and YOUR lips.http://www.PrillyPureWater.net

    1 Comment

  13. Have a look at those resources: http://resources.cawst.org/search/fluoride

     

    3 Comments