ADDITION OF ALUMINUM REAGENTS TO OXOANION-CONTAINING WATER STREAMS

摘要

The removal of oxoanions from an aqueous stream having a concentration of a metal cation and a concentration of an oxoanion that varies over time may involve continuously monitoring the concentration of the metal cation and the concentration of the oxoanion to provide a current metal cation concentration and a current oxoanion concentration. A metal cation source and an aluminum reagent may be added to the aqueous stream based on the measured current metal cation concentration and the current oxoanion concentration. The amount of the metal cation source and the aluminum reagent added to the stream may be effective to reduce the concentration of the oxoanion in the aqueous stream below a target threshold.

主权项

1. A method for reducing a concentration of one or more oxoanions in an aqueous stream comprising:
receiving an aqueous stream having a metal cation and an oxoanion, wherein a concentration of the metal cation varies over time and a concentration of the oxoanion varies over time; continuously measuring the concentration of the metal cation so as to provide a current metal cation concentration in the aqueous stream; continuously measuring the concentration of the oxoanion in the aqueous stream so as to provide a current oxoanion concentration in the aqueous stream; and adding a metal cation source to the aqueous stream and an aluminum reagent to the aqueous stream, wherein an amount of the metal cation source added to the aqueous stream is determined based on the current metal cation concentration in the aqueous stream, an amount of the aluminum reagent added to the aqueous stream is based on the current oxoanion concentration in the aqueous stream, and the amount of the metal cation source and the amount of the aluminum reagent added to the aqueous stream is effective to reduce the concentration of the oxoanion in the aqueous stream below a target threshold.