Patent ID: 8753522
Filing Date: 2014-06-17
Classification: C02F,Y10S

Abstract:
1. A system for controlling introduction of a reducing agent to a liquid stream comprising: a persulfate concentration sensor comprising a first conductivity cell, a second conductivity cell and an ultraviolet irradiation source positioned therebetween, the persulfate concentration sensor in fluid communication with the liquid stream; a source of sulfur dioxide disposed to introduce sulfur dioxide to the liquid stream downstream of the persulfate concentration sensor; a sulfur dioxide concentration sensor comprising a first conductivity cell, a second conductivity cell and an ultraviolet irradiation source positioned therebetween, the sulfur dioxide concentration sensor in fluid communication with the liquid stream and located downstream of the source of sulfur dioxide; and a controller configured to generate a control signal that regulates at least one of a rate of addition of and an amount of the sulfur dioxide introduced into the liquid stream based on at least one input signal from one of the persulfate concentration sensor and the sulfur dioxide concentration sensor.