Hambantota coastal salterns brine chemistry: harvesting magnesium sulfate bitterns?
6 Answers from travellers
The Hambantota salterns utilize fractional crystallization driven by high dry-zone evaporation rates and constant winds. Sea water is routed through successive shallow pans (reservoirs, condensers, and crystallizers) where specific minerals precipitate at defined hydrometer densities (degrees Baumé): calcium carbonate settles first at 7-12° Be, followed by gypsum (calcium sulfate) at 12-25° Be. The brine enters the crystallization tables at 25-26° Be, where pure sodium chloride forms. The remaining dense liquid—bitterns—is drained off before 30° Be to prevent bitter, hygroscopic magnesium sulfate and magnesium chloride from co-crystallizing into table salt.
Sudden showers during the inter-monsoon season dilute crystallizer salinity overnight, dissolving days of salt crust and necessitating emergency brine pumping back into deep holding ponds.
The intermediate hypersaline ponds turn bright pink due to blooms of beta-carotene-rich Dunaliella salina microalgae, which form the primary food source for wintering Greater Flamingos.
Unrefined sun-dried Hambantota sea salt displays mineral complexities prized by local chefs for pickling seasonal lime and amberella chutneys.
Industrial chemical producers in Paranthan refine the drained bitterns to extract commercial Epsom salts and industrial-grade caustic soda.
Traditional salt caravans historically used bullock carts (tavalam) to haul Hambantota rock salt into the Kandyan mountain kingdom along mountain footpaths.
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