Wastewater treatment method using molecular-state weakly acidic HOCl water

The invention discloses a wastewater treatment method using molecular-state weakly-acidic HOCl water. The main component of the molecular-state weakly-acidic HOCl water is hypochlorous acid (HOCl), the pH value is about 5-7, the molecular-state weakly-acidic HOCl water is in molecular state and is stable, the HOCl concentration is greater than or equal to 3,000 ppm, and the molecular-state weakly-acidic HOCl water has strong oxidability; and the molecular-state weakly-acidic HOCl water is produced and applied on site, that is water treatment is executed in a mixing or dosing mode when the molecular-state weakly-acidic HOCl water is generated. The method can be efficiently used for ammonia nitrogen treatment, organic matter decomposition, sterilization and disinfection treatment, is used for treating high-concentration and large-volume wastewater, and still has a good treatment effect under a low concentration. The method can be operated around the clock as required, can accurately control the concentrations o