不同S/N对硫自养短程反硝化亚硝酸盐积累特性试验研究  

Experimental Study on Accumulation Characteristics of Sulfur Autotrophic Short-Range Denitrifying Nitrite with Different S/N

作　　者：周小翔 律泽[1] 李军[1] ZHOU Xiaoxiang;LYU Ze;LI Jun(School of Munnicipal and Enviornmental Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学市政与环境工程学院,辽宁沈阳110168

出　　处：《水处理技术》2023年第12期89-93,118,共6页Technology of Water Treatment

基　　金：国家自然科学基金(51108277)。

摘　　要：短程反硝化是一种厌氧氨氧化基质NO_(2)^(-)-N获取的新型途径。在自养短程反硝化系统中,以硫代硫酸钠作为底物,在不同的硫氮比(S2-/NO_(3)^(-)-N)的条件下,通过控制水力停留时间、温度,将NO_(3)^(-)-N还原至NO_(2)^(-)-N,成功实现自养短程反硝化系统中NO_(2)^(-)-N的积累。实验结果表明,三个S/N表现出不同的NO_(2)^(-)-N的积累,S/N为1:1.14时,NO_(3)^(-)-N的去除率稳定在75%左右,NO_(2)^(-)-N的积累率(NTR)几乎为零;S/N为1:1.71时,NO_(3)^(-)-N的去除率维持在40%~50%之间,NTR增长到8%左右;S/N为1:2.28时,NO_(3)^(-)-N的去除率保持在了35%左右,而NTR持续增长到43%。反硝化速率随S/N的增大而增大,而较低碳氮比更有利于NO_(2)^(-)-N的稳定积累。经高通量测序分析得出,硫自养短程反硝化进程中存在Thioacillus、Thermomonas、Ferritrophicum等所属功能菌种。Short-cut denitrification is a new way to obtain NO_(2)^(-)-N substrate of AnammoX.In this paper,sodium thiosulfate was used as the substrate to reduce NO_(3)^(-)-N to NO_(2)^(-)-N in the autotrophic short-cut denitrification system under the condition of different sulfur nitrogen ratio(S2-/NO_(3)^(-)-N)by controlling the hydraulic retention time and temperature,and the accumulation of NO_(2)^(-)-N in the autotrophic short-cut denitrification system was successfully achieved.The experimental results showed that the three S/N showed different accumulation of NO_(2)^(-)-N.When S/N was 1:1.14,the removal rate of NO_(3)^(-)-N was stable at about 75%,and the accumulation rate of NO_(2)^(-)-N(NTR)was almost zero.When S/N is 1:1.71,the NO_(3)^(-)-N removal rate is maintained between 40%and 50%,and the NTR increases to about 8%.When S/N was 1:2.28,the NO_(3)^(-)-N removal rate remained at about 35%,while NTR continued to increase to 43%.The denitrification rate increases with the increase of S/N,and the lower C/N ratio is more conducive to the stable accumulation of NO_(2)^(-)-N.High throughput sequencing indicates that Thioacillus,Thermomonas,and Ferritrophicum are present in the process of sulfur autotrophic short-range denitrification.

关 键 词：硫自养短程反硝化 NO_(2)^(-)-N积累 硫代硫酸钠 S/N 

分 类 号：X703.1[环境科学与工程—环境工程]