沼液二级生化出水铁硫协同同步硝化-自养反硝化深度脱氮  

Advanced Nitrogen Removal of Biogas Slurry Secondary Effluent by Simultaneous Nitrification-Autotrophic Denitrification Driven of Iron and Sulfur

作　　者：欧阳创 宋立杰 薛罡[2] 徐磊 陈红[2] 李响[2] 张艾 OUYANG Chuang;SONG Lijie;XUE Gang;XU Lei;CHEN Hong;LI Xiang;ZHANG Ai(Shanghai Environmental Sanitation Engineering Design Institute Co.,Ltd.,Shanghai 200232,China;College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]上海环境卫生工程设计院有限公司,上海200232 [2]东华大学环境科学与工程学院,上海201620

出　　处：《净水技术》2024年第7期100-110,共11页Water Purification Technology

基　　金：国家自然科学基金面上项目(52170067,51878135)。

摘　　要：针对沼液二级生化出水仍含高浓度硝态氮(NO-3-N)、氨氮等问题,文中研究了铁硫协同同步硝化-自养反硝化的影响因素。结果表明,在无外加碳源的条件下,铁硫协同同步硝化反硝化可有效提高TN、NO^(-)_(3)-N和氨氮的去除率。同时,在S/N为2的条件下,对TN、NO^(-)_(3)-N、氨氮去除率分别达到51.25%、83.63%、67.33%。氮去除动力学结果表明,TN去除规律在0~15 h内符合一级反应动力学特征,且其反应速率常数(0.0510 h^(-1))大于不投铁硫的空白组(0.0355 h^(-1))。微生物群落演变规律表明,铁刨花及硫代硫酸钠的投加会使微生物群落丰富度提高、多样性降低,且投加铁硫可显著提高自养反硝化菌[硫杆菌属(Thiobacillus)、铁杆菌属(Ferribacterium)]及异养反硝化菌[聚糖菌属(Defluviicoccus)、Candidatus_Competibacter、陶厄氏菌属(Thauera)]的丰度。Aiming at the problems of high concentration of nitrate nitrogen(NO-3-N)and ammonia nitrogen in the secondary biochemical effluent of biogas slurry,the influencing factors of iron-sulfur synergistic enhanced simultaneous nitrification-autotrophic denitrification were studied.The results showed that under the conditions of no external carbon source,iron-sulfur synergy could enhance the simultaneous nitrification-denitrification and effectively improve the removal rate of TN,NO^(-)_(3)-N and ammonia nitrogen.Then,the results showed that the optimal S/N was 2.0,and the removal rates of TN,NO^(-)_(3)-N and ammonia nitrogen under this condition were 51.25%,83.63%and 67.33%,respectively.Further,the optimal S/N conditions were selected to study the nitrogen removal kinetics of the process,and the results showed that the TN removal pattern conformed to the first-order reaction kinetics within 0~15 h,and its reaction rate constant(0.0510 h^(-1))was higher than that of the control with no addition of iron scraps and sodium thiosulfate(0.0355 h^(-1)).The microbial community evolution under the optimal S/N condition revealed that the addition of ironscraps and sodium thiosulfate increased the richness and decreased the diversity of microbial communities.The addition of iron scraps and sodium thiosulfate significantly increased the abundance of autotrophic denitrifying bacteria(Thiobacillus,Ferribacterium)and heterotrophic denitrifying bacteria(Defluviicoccus,Candidatus_Competibacter,Thauera).

关 键 词：沼液 二级生化出水 同步硝化-自养反硝化 深度脱氮 

分 类 号：X703[环境科学与工程—环境工程]