The invention relates to a method and a
system for treating acidic
wastewater by ultrasonic enhanced H2O2 based on
pollutant typing, and belongs to the technical field of
hydrometallurgy wastewater treatment. In order to solve the problems that an
existing treatment process is single in scheme, poor in adaptability and not thorough in oxidation, consequently, the
chemical oxygen demand (COD) of
effluent is unstable and prone to rebound and the like, a differential precise treatment method is adopted,
pollutant classification is conducted on
wastewater, and a high
sulfite type and a high
organic matter-high
sulfite mixed type are distinguished; after pretreatment and pH adjustment, an ultrasonic enhanced H2O2
oxidation process is adopted for the high-
sulfite type wastewater, and an ultrasonic, Fe < 2 + >
catalysis, H2O2 oxidation and Fe < 3 + >
flocculation combined process is adopted for the high
organic matter-high-sulfite
mixed type wastewater. According to the method disclosed by the invention, the efficient and stable removal of COD (
Chemical Oxygen Demand) of different components is realized by matching differentiated working conditions in a parting manner and accurately controlling ultrasonic parameters, H2O2 adding amount and
reaction conditions. The total COD removal rate of the two types of wastewater is stabilized at 92%-98%, the COD of the
effluent is lower than 50 mg / L, the
emission standard is met, and COD rebound of the
effluent is effectively inhibited.