Pretreatment process of organic wastewater containing pyridines

Organic wastewater containing pyridines was collected by source separation and was treated by different processes. The pretreatment process route was as follows: evaporative desalination-micro electrolysis-Fenton oxidation. The results indicated that in the evaporative desalination period, the COD removal rate was 62.77% when the pH was 5; in the micro electrolysis period, the COD removal rate was 24.49% when the pH was 4 and the reaction time was 2.5 h; in Fenton oxidation period, the COD removal rate was 30.41% when the pH was 4, the dosing quantity of 30% H₂O₂ was 3.5 mL/L, the molar ratio of Fe²⁺ to H₂O₂ was 1:20, and the reaction time was 2.5 h. After pretreatment, the value of BOD₅/COD was up to 0.48 from 0.075, the removal rates of the three kinds of particular pollutants were all above 95%.