Improved high recovery brackish water desalination process based on fluidized bed air stripping

Raviv Segev; David Hasson; Raphael Semiat

doi:10.1016/j.desal.2011.07.043

Improved high recovery brackish water desalination process based on fluidized bed air stripping

Raviv Segev, David Hasson^*, Raphael Semiat

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

Very high water recoveries can be achieved in brackish water RO desalination by air stripping of a carbonate-rich concentrate which provides high pH conditions for precipitating calcium hardness without necessitating the use of chemicals. The scale-free concentrate solution can be then processed with a secondary RO unit to recover additional product. Simple precipitation in an MSMPR crystallizer requires relatively high retention times of the order of 2. h. The present paper describes an improved high recovery process in which precipitation is carried out in a fluidized bed (FBR) air stripping system. Experimental results are presented, showing that FBR crystallization enables very high precipitation conversion of calcium carbonate reaching 90% at considerably reduced retention times of the order of 15. min.

Original language	English
Pages (from-to)	75-79
Number of pages	5
Journal	Desalination
Volume	281
Issue number	1
DOIs	https://doi.org/10.1016/j.desal.2011.07.043
State	Published - 17 Oct 2011
Externally published	Yes

Keywords

CaCO precipitation
CO air stripping
Fluidized bed reactor
High recovery
RO desalination

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abstract = "Very high water recoveries can be achieved in brackish water RO desalination by air stripping of a carbonate-rich concentrate which provides high pH conditions for precipitating calcium hardness without necessitating the use of chemicals. The scale-free concentrate solution can be then processed with a secondary RO unit to recover additional product. Simple precipitation in an MSMPR crystallizer requires relatively high retention times of the order of 2. h. The present paper describes an improved high recovery process in which precipitation is carried out in a fluidized bed (FBR) air stripping system. Experimental results are presented, showing that FBR crystallization enables very high precipitation conversion of calcium carbonate reaching 90% at considerably reduced retention times of the order of 15. min.",

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AU - Segev, Raviv

AU - Hasson, David

AU - Semiat, Raphael

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N2 - Very high water recoveries can be achieved in brackish water RO desalination by air stripping of a carbonate-rich concentrate which provides high pH conditions for precipitating calcium hardness without necessitating the use of chemicals. The scale-free concentrate solution can be then processed with a secondary RO unit to recover additional product. Simple precipitation in an MSMPR crystallizer requires relatively high retention times of the order of 2. h. The present paper describes an improved high recovery process in which precipitation is carried out in a fluidized bed (FBR) air stripping system. Experimental results are presented, showing that FBR crystallization enables very high precipitation conversion of calcium carbonate reaching 90% at considerably reduced retention times of the order of 15. min.

AB - Very high water recoveries can be achieved in brackish water RO desalination by air stripping of a carbonate-rich concentrate which provides high pH conditions for precipitating calcium hardness without necessitating the use of chemicals. The scale-free concentrate solution can be then processed with a secondary RO unit to recover additional product. Simple precipitation in an MSMPR crystallizer requires relatively high retention times of the order of 2. h. The present paper describes an improved high recovery process in which precipitation is carried out in a fluidized bed (FBR) air stripping system. Experimental results are presented, showing that FBR crystallization enables very high precipitation conversion of calcium carbonate reaching 90% at considerably reduced retention times of the order of 15. min.

KW - CaCO precipitation

KW - CO air stripping

KW - Fluidized bed reactor

KW - High recovery

KW - RO desalination

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DO - 10.1016/j.desal.2011.07.043

M3 - 文章

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JO - Desalination

JF - Desalination

SN - 0011-9164

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Improved high recovery brackish water desalination process based on fluidized bed air stripping

Abstract

Keywords

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