Enhancement of nitrate bioreduction by different metal-humic acid complexes
Yu Xiao1,2， Liu Weilong1,2， Niu Yanyan1,2， GuoYankai1,2， Yue Lin1,2， Guo Jianbo3， Lian Jing1,2
1. School of Environmental Science and Engineering， Hebei University of Science and Technology， Shijiazhuang， 050018，China; 2. Pollution Prevention Biotechnology Laboratory of Hebei Province， Shijiazhuang， 050018， China;
3. School of Environmental and Municipal Engineering， Tianjin Chengjian University， Tianjin 300384， China
Based on the principle that humic acid can form an insoluble complex with some metalas through complexation or chelation, with nitrate wastewater as the target pollutant, three insoluble Ni-HA、 Co-HA and Ca-HA metal-humic acid complexes were prepared， and the characteristics of nitrate bioreduction as redox mediators were investigated. The experimental results show that at the end of the experiment， the nitrate removal rates of Ni-HA， Co-HA and Ca-HA were 95.4%， 93.4%and 92.6% respectively. Compared with the control group， the nitrate removal rate (89.7%) was increased by 6.0%、3.7%and 2.9% respectively. According to the cyclic voltammograms， the redox peak of Ni-HA was the most obvious，and it has better electron transport activity.
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