In our living environment, chlorine-based disinfectants are widely familiar to the public, whereas active oxygen disinfection remains relatively underknown. While chlorine-based disinfectants are commonly used and effective, they have a critical limitation: chlorination of wastewater tends to generate harmful byproducts such as trichloromethane. Improper handling of these contaminants may lead to secondary water pollution. Additionally, drinking water transported through pipelines is susceptible to contamination by heavy metals, bacteria, and other pollutants, resulting in tertiary pollution.

Is active oxygen disinfection advantageous? Is it superior to chlorine-based disinfectants? It can be argued that each has its own merits. Chlorine dioxide, a fourth-generation chlorine-containing disinfectant, exhibits stable disinfection performance. For active oxygen, when formulated appropriately, it can achieve favorable disinfection efficacy—both types share the core functions of disinfection and sterilization.

Having briefly compared chlorine-based and active oxygen disinfectants, we now turn to the core topic: mastering the operation of active oxygen detection in drinking water. Regardless of the disinfection method employed, dosage control is paramount. Excessive dosage may trigger reactions with other substances, causing secondary pollution, while insufficient dosage significantly compromises disinfection effectiveness.

Active oxygen disinfectants primarily exist as potassium peroxymonosulfate composite salt powder, which is dissolved into a liquid solution and dosed into wastewater for disinfection. The efficacy of active oxygen disinfection is evaluated by detecting the initial active oxygen concentration in water and the residual active oxygen concentration following a specified monitoring period.

The ROS900 Online Active Oxygen Analyzer is utilized for this detection process. The instrument operates as follows: water samples and anti-interference agents are automatically injected into a reactor, followed by the automatic addition of a characteristic chromogenic reagent to initiate a color reaction. The absorbance of the resulting product is then measured, and the active oxygen content in the water is directly determined based on the absorbance data.

This analyzer is primarily applicable to the detection of domestic drinking water and the medical wastewater online monitoring.