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The present paper describes pilot plant development of a novel process enabling increase of water recovery in brackish water desalination without using any chemicals. This is achieved by precipitating the scaling salts of a carbonate-rich concentrate by increasing the pH through air stripping of CO 2 from the solution. Additional permeate is extracted from the treated concentrate by a secondary...
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...
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