Process description for using industrial hydrochloric acid in sewage treatment plants
Time of issue:
2022-04-28
1. The organic oxidation of pollutants is mainly due to the strong oxidation of divalent iron ions in ferrous sulfate with hydrogen peroxide (H2O2) under acidic conditions, which generates hydroxyl radicals. Among them, · OH undergoes a series of free radical reactions. The theoretical reaction process pH is below 3.7, and in practical applications, the pH is controlled at around 3.
The process of treating wastewater with Fenton reagent mainly involves the oxidation and coagulation precipitation of organic pollutants.
1. The organic oxidation of pollutants is mainly due to the strong oxidation of divalent iron ions in ferrous sulfate with hydrogen peroxide (H2O2) under acidic conditions, which generates hydroxyl radicals. Among them, · OH undergoes a series of free radical reactions. The theoretical reaction process pH is below 3.7, and in practical applications, the pH is controlled at around 3.
2. The coagulation and sedimentation of pollutants are mainly due to the reaction of divalent iron ions in ferrous sulfate with wastewater to form iron hydroxide colloids, which react with organic pollutants in the wastewater to produce net capture adsorption and flocculation, leading to their precipitation. The approximate reaction process of Fenton reagent is:
Fe2+ +H2O2==Fe3+ +OH-+HO·
Fe3+ +H2O2+OH-==Fe2+ +H2O+HO·
Fe3+ +H2O2==Fe2+ +H+ +HO2
HO2+H2O2==H2O+O2↑+HO
[Fe(H2O)6]3++H2O→[Fe(H2O)5OH]2++H3O+
[Fe(H2O)5OH]2++H2O→[Fe(H2O)4(OH)2]++H3O+
Due to the requirement of an acidic solution with a pH value of 3.7 in wastewater treatment, industrial hydrochloric acid is needed for adjustment.
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