School of the Environment, State Key Laboratory for Pollution Control and Resource Reuse, Nanjing University Xianlin Campus, Nanjing 210023, China.
School of the Environment, State Key Laboratory for Pollution Control and Resource Reuse, Nanjing University Xianlin Campus, Nanjing 210023, China.
Bioresour Technol. 2021 Sep;335:125245. doi: 10.1016/j.biortech.2021.125245. Epub 2021 Apr 30.
Nitrate is one of the most common water contaminants and has caused severe environmental problems. This work aimed to investigate the effects of integration of denitrifier with biochars on nitrate removal and understand the underlying mechanisms. The results showed that physiochemical properties of biochars varied according to different feedstocks, which influenced bacteria attachment and nitrate removal through adsorption. However, bacteria could colonize on biochars no matter biochars surface were favorable for bacteria attachment or not. Immobilization of denitrifier on biochars significantly improved nitrate removal efficiencies and reduced lag time. Underlying mechanisms investigation showed that the integration of denitrifier with biochars had synergetic effects on promoting nitrate removal, which improved not only the expression and activity of nitrate reductase, but also the electron transport system activity.
硝酸盐是最常见的水体污染物之一，已造成严重的环境问题。本工作旨在研究反硝化菌与生物炭集成对硝酸盐去除的影响，并探讨其作用机制。结果表明，生物炭的理化性质因原料而异，这通过吸附作用影响细菌附着和硝酸盐去除。然而，细菌可以在生物炭上定殖，无论生物炭表面是否有利于细菌附着。反硝化菌固定在生物炭上显著提高了硝酸盐去除效率并缩短了迟滞期。作用机制研究表明，反硝化菌与生物炭的集成对促进硝酸盐去除具有协同作用，不仅提高了硝酸盐还原酶的表达和活性，还提高了电子传递系统的活性。
