Method of removing phosphorus from wastewater
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United States of America Patent
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Nov 13, 2007
Grant Date -
N/A
app pub date -
May 4, 2005
filing date -
May 4, 2005
priority date (Note) -
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Abstract
A method of and system for removing phosphorus from wastewater using a waste sludge that has a high affinity for phosphorus. So the waste sludge can be used in a flow-through contact reactor to remove the phosphorus from a wastewater stream, the waste sludge is pelletized. The waste sludge pellets are packed into one or more flow-through contact reactors. In the configuration described herein, phosphorus removal is maximized by flowing the wastewater through the reactor(s) in a 'pulsed' manner, rather than continuously. Thus, wastewater is flowed through the reactor(s) for a period of time and stopped for a period of time. By giving the sludge absorbent a rest period, the absorption capacity of the sludge is increased significantly, thus decreasing the frequency of regeneration or replacement of the sludge. Sludge regeneration can be accomplished with a stripping step using an alkaline solution of pH 13, followed by rinsing with water.
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