Environmental Engineering Reference
In-Depth Information
low, natural evaporation is used for extracting
salt from the sea water. In the south of France,
Puerto Rico, central California, the Bahamas,
Hawaii and The Netherland Antilles, sea salt is
extracted and reined to produce table salt. The
process begins by allowing sea water to enter
shallow ponds. Evaporation of the water pro-
duces a concentrated salt solution to which more
sea water is added. Finally, the water is allowed
to totally evaporate, leaving a thick salt layer
behind that can be processed commercially. In
Indian subcontinent, salt pans (Fig.
7.34
) are
Fig. 7.34 a
Coastal waters stocked in shallow ponds for
procuring salt through evaporation.
b
Salt extracted after
evaporation in coastal region: a major threat to ground
water table and adjacent agricultural land through vertical
and horizontal migrations of hypersaline water
