Performances and mechanisms of microbial nitrate removal coupling sediment-based biochar and nanoscale zero-valent iron
Performances and mechanisms of microbial nitrate removal coupling sediment-based biochar and nanoscale zero-valent iron
复制标题
沉积物生物炭与纳米零价铁耦合微生物去除硝酸盐的性能和机制
DOI：
10.1016/j.biortech.2021.126523
复制
发表时间：
2021-12-16
影响因子：
11.4
通讯作者：
Li, Jun
中科院分区：
文献类型：
--
作者：
Liu, Xiaohui;Wei, Jia;Li, Jun
Immobilized microorganism technology has attracted increasing attention for high concentration of microbes, low cell loss and high resistance to impact of environment. The microbial reduction of nitrate in the presence of sediment-based biochar (SBC) and nanoscale zero-valent iron (nZVI) was investigated in four different free systems. NZVI-SBC/bacteria system realized the best nitrate removal of 97.61% within 3 days through the synergistic effect of SBC and nZVI on denitrifying bacteria. Accumulation of nitrite and ammonium in nZVI-SBC/ bacteria system also decreased. High-throughput sequencing results showed that the proportion of denitrifying bacteria in microbial community structure increased after adding nZVI-SBC. The performance of nitrate removal was then studied through PVA/SA-immobilization. Immobilized active pellets performed better nitrate removal (98.89%) and stronger tolerance under different conditions than the free bacterial cells. Overall, this study provided a promising approach by utilizing SBC and nZVI for the bio-remediation of nitrate-contaminated water in practical application.
