METHODS AND SYSTEMS FOR IMPROVED DOSING OF A CHEMICAL TREATMENT, SUCH AS CHLORINE DIOXIDE, INTO A FLUID STREAM, SUCH AS A WASTEWATER STREAM

摘要

The invention is directed to methods, apparatuses, and systems for treatmentof a liquid flow comprising addition of a chemical treatment at at least twolocations (16, 24) along a side stream of a main flow (4) of said liquid, inwhich the dosing by such additions is sufficient to treat the entire main flowupon return of the side stream to the main flow. Algorithms are utilized tocontrol the additions at the locations of addition of chemical treatments. Ina typical embodiment, one chemical addition is principally proportional to theflow rate of the liquid flow, and the other chemical addition is principallyadjusted based on signals from a primary measuring device that measures aparameter in the flow after one or both chemical additions. The addition ofchlorine dioxide as the chemical treatment, to disinfect wastewater, isdiscussed.