Disinfection is a key step in wastewater treatment. Domestic sewage, industrial wastewater, medical wastewater and other types of wastewater must be properly treated, with wastewater monitoring conducted to meet relevant standards before discharge or reuse, and disinfection is an essential part of this process. After wastewater is disinfected in the disinfection tank, residual disinfectant will be tested to verify effective disinfection and avoid insufficient or excessive dosing. Disinfected wastewater generally falls into two application scenarios as follows:

1. Recycled for reuse via a circulating water system. It can be reused in production processes to reduce external wastewater discharge. Supplementary minor treatment and wastewater monitoring are required before reuse.
2. Further purified to separate pollutants or convert harmful substances into harmless substances. After passing disinfection and quality inspection, the treated water can either be discharged into natural water bodies or reused for purposes such as irrigation, vehicle washing and aquaculture. All reuse scenarios must comply with corresponding water quality standards.

With continuous development of industry and agriculture, water pollution remains a persistent concern. Strict water quality management is necessary to protect a healthy living environment.