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首页> 外文期刊>Journal of environmental science and health, Part A. Toxic/hazardous substances & environmental engineering >The usage of calcium phosphate systems for onsite defluoridation treatment
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The usage of calcium phosphate systems for onsite defluoridation treatment

机译：The usage of calcium phosphate systems for onsite defluoridation treatment

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Over 200 million people in over 35 countries are affected by excessive fluoride in their waters. For people that do not have access to a centralized water treatment plant, there is a need for an on-site defluoridation system that requires no special operational expertise, does not use hazardous chemicals, and is sustainable by the local population. 8 different calcium phosphate precipitation systems were analyzed and tested for fluoride removal effectiveness. An effective system would have final fluoride concentrations less than 1.5 mg/L and final solutions with pH within drinkable limits. Phosphoric acid with the addition of a calcium carbonate source was found to have a 99.8 fluoride removal rate. Monosodium phosphate with addition of slaked lime was also found to be effective with a 99.98 fluoride removal rate. An optimal slaked lime to monosodium phosphate ratio that achieved effective fluoride removal and neutral pH was found. With 0.45 g of Ca(OH)(2) and 1 g of NaH2PO4, initial fluoride concentrations up to 100 mg/L or more could be reduced to near zero concentrations, and a volume of approximately 337 mL of water with a concentration of 5 mg/L F- could to be reduced to less than 1.5 mg/L F-.

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