硫自养/异养协同反硝化深度脱氮处理三氯蔗糖生产废水

为解决工业废水普遍存在的氮污染问题及单一电子供体的反硝化技术存在的缺陷，在上流式高效流化床反硝化反应器中，本文以Na₂S₂O₃和葡萄糖为底物构建硫自养/异养协同反硝化脱氮系统，研究其对三氯蔗糖生产废水二级处理出水的深度脱氮效果。在(35±1)℃下，调整进水C/N/S为1.3/1/1.9，反应器在40~109天运行期间，达到较高的脱氮水平，NO{}_{\mathrm{3}}^{-}-N去除率均在93%以上，最大NO{}_{\mathrm{3}}^{-}-N去除负荷达到3.52kg/(m³·d)，且在不投加pH缓冲剂的条件下，出水pH始终保持在7.0以上。硫自养/异养协同反硝化污泥的群落组成以自养反硝化菌和兼养反硝化菌为主，其占比分别为45.69%和25.38%，异养反硝化菌相对较少。其中Thiobacillus是相对丰度最高的自养反硝化细菌，占比39.02%。

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{}_{\mathrm{3}}^{-}-N removal rates were above 93%, Maximum NO{}_{\mathrm{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%.