Measuring system and measuring method of hydrogen peroxide concentration

A hydrogen peroxide concentration measurement system for measuring a concentration of hydrogen peroxide in sample water collected from a predetermined position in a water treatment process, the system comprises:

• a sample water collector collecting the sample water,
• a route introducing the collected sample water into a first dissolved oxygen concentration measuring analyzer through a first pipe line to measure a concentration of dissolved oxygen,
• a route introducing the collected sample water into a hydrogen peroxide decomposition device to obtain a treated water subjected to a decomposition treatment of the hydrogen peroxide, and introducing the treated water into a second dissolved oxygen concentration measuring analyzer through a second pipe line to measure the dissolved oxygen concentration in the treated water,
• a connection pipe line connecting the first pipe line and the second pipe line,
• a first on-off valve disposed on an upstream side of a branch position in at least one of the first pipe line and the second pipe line with the connection pipe line,
• a connection valve disposed in the connection pipe line,
• a valve controller for controlling an opening and a closing of the first on-off valve and the connection valve, and
• a calculator calculating a corrected concentration of hydrogen peroxide in the sample water from the following equation:
• (Δ1−Δ2)×(68/32)
• by setting a measured value measured in a measured value acquisition mode as Δ1, and setting a corrected value acquired in a corrected value acquisition mode as Δ2,
• wherein the measured value is a difference between a dissolved oxygen concentration value of the sample water measured by the first dissolved oxygen concentration measuring analyzer and a dissolved oxygen concentration value of the treated water measured by the second dissolved oxygen concentration measuring analyzer, and the corrected value is a difference between the dissolved oxygen concentration values of the sample water or the treated water measured by the first and second dissolved oxygen concentration measuring analyzers.