Patent ID: 6949196
Filing Date: 2005-09-27
Classification: C02F,Y02W

Abstract:
1. A method to control the level of addition of a chemical treatment to a main flow of a fluid wastestream being treated thereby, for a particular purpose, comprising: a. forming a side stream from said main flow at a diverting point; b. determining the flow rate of said main flow; c. adding said chemical treatment at a first addition point of said side stream, at a level of addition based principally on proportionality to said wastestream's main flow flow rate; d. measuring, at a first measuring point downstream from said first addition point, the concentration of said chemical treatment in said side stream; e. adding said chemical treatment at a second addition point of said side stream, at a level of addition based principally on the difference between the level of addition at said first addition point and the concentration measured in step ‘d;’ and f. returning said side stream to said main flow of said wastestream downstream of said diverting point; whereby said wastestream thereby is provided with a desired level of chemical treatment additions to achieve said particular purpose.