Method of removing phosphorus from wastewater

Details Method of removing phosphorus from wastewater Method of removing phosphorus from wastewater

2007-06-22

2010-11-09

Hruskoci, Peter A (Department: 1797)

Liquid purification or separation

Processes

Treatment by living organism

C210S711000, C210S713000, C210S714000, C210S725000, C210S727000, C210S906000

Reexamination Certificate

active

07828976

ABSTRACT:
A process for removing phosphorus from wastewater wherein an iron or aluminum salt is added to the wastewater. The iron or aluminum salt results in the precipitation of certain iron or aluminum species that include phosphorus adsorption sites. These iron or phosphorus species are settled and become a part of sludge produced in the course of the wastewater treatment process. By recycling substantial portions of the sludge, the concentration of these iron or aluminum species in the wastewater is increased. This increased concentration results in the presence of large quantities of unused phosphorus adsorption sites that attract and adsorb phosphorus, resulting in phosphorus being removed from the wastewater.

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