Solar desalination, brine and fine chemicals - a preliminary report
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Solar stills put into operation by taking known quantities of sea water of different salinities varying from 27. 75 - 36.27 x 103 during April-May 1990, indicated fresh water yield of 55-68% (av. 64) The volumes of brine as well as those of bitterns, obtained by further concentration of brine samples varied from 30 to 350 ml and indicated large volumes of brine recoverable from high salinity waters (>30x103). The analyses of boron in water samples of different salinities showed concentrations to range from 3.65 - 4.63 ppm. The definite volumes of seawater samples (3.7 litres) taken in stills for desalination correspond to 13.08 - 31.16 mg of net boron content. Analyses on the recovery of the total content of boron in brines as well as in the bitterns of these water indicated 57 - 83% recovery. The highest recovered boron in brine was 25.96 mg as against the total expected 31.36 mg in the total quantity of seawater in still. So also, the highest recovered boron in the bittern was 15.02 mg as against the total expected 23.73 mg. The observed lowest recoveries of boron below 65% in the concentrated samples indicated the possible loss of boron due to the removal by adsorption onto the preformed salts.
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