Freezing purification system and method for decontamination and desalination of water
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United States of America Patent
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Mar 28, 1995
Grant Date -
N/A
app pub date -
Dec 14, 1993
filing date -
Dec 14, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Both a system and method are provided for purifying contaminated raw water into potable water by freezing. The system of the invention includes an ice grid having heat exchange surfaces that define cavities for producing ice solids having a surface to volume ratio no greater than 25 to 1, a refrigeration unit for indirectly cooling the heat exchange surfaces to at least the freezing point of the raw water, and an array of spray nozzles that continuously flows raw water over the cavities of the ice grid such that ice solids form from substantially pure water incrementally built up from the heat exchange surfaces of the grid to ultimately fill the grid cavities. The raw water is frozen slowly enough so that unfrozen contaminants expelled from the incrementally freezing ice are continuously washed away from the surface of the growing ice by a continuously raw water flow. After the freezing operation is completed, the resulting ice solids are rinsed with previously purified water to remove any contaminants lodged on their surfaces. The relatively low surface to volume ratio of the resulting ice solid results in a high percentage of pure water reclamation, as excessive melting of the pure water ice solids during the rinsing step is avoided.
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