Deep treatment of sucralose wastewater with sulfur autotrophic/heterotrophic synergistic denitrification

In order to solve the problem of nitrogen pollution in industrial wastewater and the defects of denitrification technology of single electron donor, a sulfur autotrophic/heterotrophic synergistic denitrification system was constructed in an upflow high efficiency fluidized bed denitrification reactor with Na2S2O3 and glucose as substrates. The deep denitrification of the sucrose trichloride production wastewater was studied. Under (35±1)℃, influent C/N/S was adjusted to 1.3/1/1.9, the operation of reactor for 40~109d reached a high nitrogen removal level. NO-3-N removal load up to 3.52kg/(m3·d), And without pH buffer, effluent pH is always above 7.0. The community composition of sulfur autotrophic/heterotrophic synergistic denitrification sludge was mainly autotrophic denitrifying bacteria and concurrent denitrifying bacteria, the proportion of which was 45.69% and 25.38% respectively, and the heterotrophic denitrifying bacteria were relatively few. Among them, Thiobacillus were the most abundant autotrophic denitrifying bacteria, accounting for 39.02%. © 2021, Chemical Industry Press Co., Ltd. All right reserved.