Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1978-04-06
1980-02-12
Hart, Charles N.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 45, 210 46, 210 47, 210 53, 203 7, 203 10, 203 26, 203DIG20, 204180P, C02B 120, B01D 1302, B01D 2101
Patent
active
041882911
ABSTRACT:
A method is disclosed for processing industrial waste waters and, in particular, blow down water from thermal electric plants. The water is processed to concentrate the salts contained therein and to obtain a concentrated brine which can then be passed to a thermal evaporator and/or solar evaporation ponds. The water is processed by the addition of magnesium hydroxide and carbon dioxide in amounts sufficient to precipitate the calcium as calcium carbonate, thereby obtaining a water reduced in calcium content and increased in magnesium content from the industrial waste water. The treated water is processed to recover a purified water from a brine, preferably by reverse osmosis. Calcium hydroxide is added to the brine generated by the reverse osmosis process in an amount sufficient to precipitate magnesium hydroxide therefrom which can be recycled to supply the magnesium hydroxide used in pre-treatment of the water prior to the reverse osmosis process. A clarified brine is recovered from the magnesium hydroxide precipitation step and may then be naturally or thermally evaporated to produce a saturated slurry of salt solids. This slurry can then be further reduced to dryness by solar evaporation.
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Hart Charles N.
Therkorn Ernest G.
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