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《Chinese Journal of Environmental Engineering》 2012-01
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Reducing nitrate in groundwater by bimetallic nanoparticles integrated with denitrifying bacteria

Xia Hongcai1 Jin Zhaohui1,2 Li Tielong1,2 Zhang Na1 Li Ning1(1.College of Environmental Science and Engineering,Nankai University,Tianjin 300071,China; 2.Key Laboratory of Pollution Processes and Environmental Criteria(Nankai University),Ministry of Education,Tianjin 300071,China)  
In this study,nano-scale Fe0,Fe/Ni and Fe/Cu synthesized with different liquid-phase reduction methods,were studied integrated with denitrifying bacteria to remove nitrate from groundwater.Batch experiments were carried out to examine the removal rate of nitrate and the products of the denitrification in these three systems.Also,the total RNA content of bacteria were studied to evaluate the toxicity of bimetallic nanopaticles to the integrated bacteria.The results showed that almost 100% removal of nitrate was reached within 9 days in the Fe0 nanoparticles system with nitrite transitory accumulation,and the ratio of ammonium to TN was 52%.The Fe/Ni nanoparticles system significantly enhanced the rate of nitrate reduction,removing almostly nitrate within a period of 6 days,hardly detecting the product of nitrite,while the ammonium of the final products was high to 69%.Nano-scale Fe/Cu system took 7 days to complete 100% removal of nitrate,producing less ammonium,only 39%,but there was 33% nitrite remained in the system.Experimental results also showed that the toxicity of these three types of nanoparticles to denitrifying bacteria should be in the sequence: nano-scale Fe/Ninano-scale Fe/Cu nano-scale Fe0.
【Fund】: 国家自然科学基金资助项目(40971254);; 青年科学基金资助项目(20907023)
【CateGory Index】: TU991.2
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