System and Process for Removal of Phosphorous and Ammonia from Aqueous Streams
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United States of America Patent
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N/A
Issued Date -
Dec 18, 2008
app pub date -
Mar 13, 2008
filing date -
Mar 16, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
We disclose a process for the removal of phosphorous and ammonia from an aqueous stream by contacting the aqueous stream with magnesium and base in a first zone having a first pH, to form an (n-1)th mixed stream and a first portion of struvite; separating the (n-1)th mixed stream from the first portion of struvite; removing at least some struvite from the first portion of struvite; contacting the (n-1)th mixed stream with base in an nth zone, wherein n is an integer incrementing from 2 to n.sub.max, wherein n.sub.max is an integer from 2 to about 5, and wherein the nth zone has an nth pH higher than the (n-1)th pH, to form an nth mixed stream and an nth portion of struvite, except no base is added and the nth pH need not be higher than the (n-1)th pH when n=n.sub.max; separating the nth mixed stream from the nth portion of struvite; returning the nth portion of struvite to the (n-1)th zone; and, if n
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