SIMULTANEOUS RECOVERY OF COAGULANT AND ACID
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United States of America Patent
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Dec 5, 2013
app pub date -
Jun 5, 2012
filing date -
Jun 5, 2012
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Abstract
Processes and systems are provided for simultaneously recovering coagulant and acid in a water treatment system. Sludge produced by the water treatment system is contacted with acid to form acidified solids. The acidified solids flow into a combined membrane treatment tank having both cation and anion exchange membranes. Metal cations from the acidified solids cell diffuse across the cation exchange membranes to form recovered coagulant, while anions from the acidified solids diffuse across the anion exchange membranes to form recovered acid. The diffusion rate of the metal cations across the cation exchange membranes may be equal to or greater than the diffusion rate of the anions across the anion exchange membranes.
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