Abstract
Samples from six different brands of bone char are tested for their capacity to remove fluoride from water in batch. Initial concentrations of 10 mg/L and contact times of 6 hours are used. The removal capacities observed are 0.6-1.1 mg/g on an average, s.d. being 0.16.
Addition of calcium and phosphate compounds to the jar experiments results in more than doubling of these capacities, on average 1.9 mg/g, s.d. being 0.14. One of bone char products is setup in columns are fed with water, 100 mg/L, for saturation. Hereafter the coloumns are fed with water of 10 mgF/L where calcium and phosphate are added as in the contact precipitation process. The results show that the columns are able to remove up to 700 bedvolumes, before the concentration of fluoride in the effluent water breaks through, above 1.5 mg/L. Operational removal capacities observed are 7 and 9 mg/L, depending on contact time and the dosage of chemicals.
It is discussed that longer contact time and higher dosage of calcium and phosphate may result in longer operation periods in the contact precipitation columns.
Original language | English |
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Title of host publication | Proceedings of the 3rd International Workshop on Fluorosis Prevention and Defluoridation of Water |
Editors | E. Dahi, S. Rajchagool, N. Osiriphan |
Place of Publication | Chiang Mai, Thailand |
Publisher | ISFR, EnDeCo & ICOH |
Publication date | 2002 |
Pages | 61-72 |
Publication status | Published - 2002 |
Event | 3rd International Workshop on Fluorosis Prevention and Defluoridation of Water - Chiang Mai, Thailand Duration: 20 Nov 2000 → 24 Nov 2000 Conference number: 3 |
Workshop
Workshop | 3rd International Workshop on Fluorosis Prevention and Defluoridation of Water |
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Number | 3 |
Country/Territory | Thailand |
City | Chiang Mai |
Period | 20/11/2000 → 24/11/2000 |
Keywords
- sorption
- Bone char
- contact precipitation
- batch experiment
- pyrolysis
- defluoridation
- dynamic removal capacity
- calcination
- flowexperiment
- operational removal capacity
- jar test