丙酸盐对厌氧氨氧化除氮性能及群落结构的影响

Influence of Propionate on Performance and Community Structure of an Anammox Reactor

为了探究有机碳对厌氧氨氧化的长期影响,向厌氧氨氧化膜生物反应器中添加不同浓度的丙酸钠,研究对反应器的除氮效能以及微生物的种群结构和功能变化。结果表明:反应器主要的脱氮过程由Candidatus Brocadia完成,当丙酸钠浓度为100 mg/L时,反应器中由于异养细菌的生长,可实现碳氮的同步去除,平均总氮去除率可达91.9%。当丙酸钠浓度为200 mg/L时,对Candidatus Brocadia的抑制作用导致反应器除氮性能下降,Candidatus Brocadia的丰度降至41.2%,总氮去除率降至78.8%。在有机碳抑制作用解除后,反应器的除氮性能恢复为86.8%,Candidatus Brocadia丰度增加到54.0%,但群落多样性下降,属水平的微生物组成有较大的改变。

In order to study the long-term influence of organic carbon on performance and community structure of an Anammox reactor,propionate was amended stepwise into an enriched Anammox reactor to investigate the dynamic change of the structure and function of the community.The results suggested that nitrogen removal process was mainly achieved by Candidatus Brocadia.Carbon and nitrogen were simultaneously removed by the growth of heterotrophic bacteria under 100 mg/L propionate,while total nitrogen removal efficiency reached 91.9%.A suppression of growth of Candidatus Brocadia and a significant reduction of total nitrogen removal were observed at the present of 200 mg/L propionate.The relative abundance of Candidatus Brocadia and total nitrogen removal efficiency decreased to 41.2%and 78.8%respectively.After propionate concentration recovered to 0 mg/L,the nitrogen removal efficiency of the reactor improved to 86.8%and the abundance of Candidatus Brocadia was recovered to 54.0%.However,the community diversity decreased and the microbial composition at genus level changed a lot.