atHigh chromaticity wastewater treatmentIn wastewater from printing and dyeing, papermaking, food processing, etc., ferrous sulfate can be classified asDecolorizing agent seriesThe decolorization effect is mainly achieved through two mechanisms:
- Adsorption and wrapping effectThe hydrolyzed iron hydroxide colloid has a large specific surface area and strong adsorption capacity, which can directly adsorb colored organic compounds (such as dye molecules and pigments) in water and remove them by sedimentation through floc encapsulation;
- Reductive decolorization effectThe Fe ² ⁺ in ferrous sulfate has a certain degree of reducibility and can undergo reduction reactions with some oxidative dyes (such as azo and anthraquinone dyes), destroying the chromophore groups of dye molecules (such as double bonds and conjugated systems), causing the color of wastewater to fade, and then combined with coagulation to settle and separate the degradation products.
Note: This function needs to be used in conjunction with pH regulators (such as lime and sodium hydroxide) to ensure the hydrolysis and oxidation efficiency of Fe ² ⁺. It is usually used as a "pretreatment method" for decolorization processes, and further advanced treatments such as activated carbon adsorption and ozone oxidation are required to enhance decolorization efficiency.
