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<strong>Column evaluation of a water defluoridation technique based on phosphoric acid-enhanced limestone adsorption</strong>

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Title Statement <strong>Column evaluation of a water defluoridation technique based on phosphoric acid-enhanced limestone adsorption</strong>
 
Added Entry - Uncontrolled Name Gogoi, Sweety ; M.Sc. Department of Chemical Sciences Tezpur University, Tezpur – 784 028
Dutta, R K ; Professor Department of Chemical Sciences Tezpur University, Tezpur – 784 028
 
Uncontrolled Index Term Limestone defluoridation; Phosphoric acid; Hydroxyapatite; Breakthrough analysis; Regeneration studies
 
Summary, etc. Fluoride removal from water by phosphoric acid-enhanced limestone defluoridation has been studied in a continuous-flow mode using crushed limestone column by adding dilute phosphoric acid (PA) to the influent water. The flow rate of the gravitationally fed water in an up-flow mode is controlled with a flow controller. Fluoride has been removed from initial 5 mg/L to 0.1 mg/L using 0.01-0.05 M initial PA. The <em>p</em>H of the treated water was between 7.4 and 7.7. The present continuous-flow mode show almost four times higher fluoride removal capacity of the limestone than that of the batch mode reported earlier. The continuous-flow mode also shows better regeneration of the exhausted limestone and lower recurring cost compared to that of the batch mode. The kinetic and mechanistic behaviour of fluoride removal in the continuous-flow mode has been found to be somewhat different from that of the batch mode. Three stages of fluoride removal observed as a function of throughput volume have been attributed to gradually diminishing precipitation and sorption of fluoride as the limestone surface is gradually covered by adsorbed fluoride, and precipitate of calcium carbonate and fluoroapatite.
 
Publication, Distribution, Etc. Indian Journal of Chemical Technology (IJCT)
2017-09-04 09:47:39
 
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http://op.niscair.res.in/index.php/IJCT/article/view/11881
 
Data Source Entry Indian Journal of Chemical Technology (IJCT); ##issue.vol## 24, ##issue.no## 4 (2017): Indian Journal of Chemical Technology
 
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Nonspecific Relationship Entry http://op.niscair.res.in/index.php/IJCT/article/download/11881/33826