Research on the Effect and Mechanism of Fluoride Reduction and Quality Enhancement in Lushan Hot Spring
Economic and efficient fluoride reduction and retention of beneficial components are the urgent problems to be solved to improve the quality of fluoridated hot spring water into safe drinking water.Taking Lushan hot spring water as the research object,food-grade alkaline magnesium carbonate(FGBMC)was used as the fluoride reduction agent to study the mechanism and effect of fluoride adsorption by magnesium carbonate in the hot spring water,as well as the influence of the main control factors,such as the time of oscillation,the amount of dosage,and the frequency of oscillation,on the effect of fluoride reduction and the water quality.The results show that FGBMC has significant fluoride reduction effect,high safety,and can effectively retain the beneficial components of the water body.The optimal solution was 1.9 g of FGBMC,30 mL of hot spring water,T=25℃,oscillation at 100 r/min for 60 min,followed by 30 min of resting,and the F-concentration met the standards of medical value(>1.0 mg/L)and natural mineral water for drinking(<1.5 mg/L);and the concentrations of the beneficial components,H2SiO3,Sr,and Li,met the standards of natural mineral water for drinking.The concentration of beneficial components H2SiO3,Sr and Li was in accordance with the standard of drinking natural mineral water,and the effect of fluoride reduction and quality enhancement was good;the adsorption process of F-by FGBMC was in accordance with the quasi-primary and quasi-secondary kinetic model,and the adsorption process belonged to the physico-chemical adsorption;the results of the characterization showed that there existed ion-exchange reaction and complexation reaction between the surface of F-and FGBMC;and the results of the simulation showed that the beneficial components F and Li existed in the form of F-and Li+,and the Si was in the form of SiO2,HSiO3-,and NaHSiO3,and Sr is mainly in the form of Sr2+,SrCO3,and SrSO4,and the change of pH will cause the transformation of the main forms of Si and Sr.
Food grade basic magnesium carbonate(FGBMC)Lushan Hot springFluorinebeneficial componentsadsorption propertymineral water
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维普
