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《Environmental Science & Technology》 2012-01
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Denitrification Effect of Heterotrophic Nitrifying and Aerobic Denitrifying Bacteria Strain qy37 Immobilized in Absorbent and Entrapping Materials

ZHANG Chen,ZHANG Pei-yu*,SUN Meng,WU Yu-guang(Department of Environmental Science and Engineering,Qingdao University,Qingdao 266071,China)  
Influence of different immobilized vector and methods on the effect of immobilization was studied respectively,with denitrification effect of heterotrophic nitrifying and aerobic denitrifying bacteria Strain qy37 after immobilization as examined standard.Results showed that while using 4 kinds of material such as carbon nanotubes,porous ceramic,activated carbon and graphite as absorbent materials,effect of absorbent materials nanomaterials is the best,with nitrogen removal rate up to 94%.While using sodium alginate(SA),polyvinyl alcohol(PVA),PVA-SA,PVA-SA-activated carbon and PVA-SA-carbon nanotubes as entrapping materials,the fixed effects of PVA and SA mixed as the embedding medium are better than embedding alone,with the best embedding ratio of embedding medium PVA and additives SA as 10:1.Composite immobilization with the adsorbed material as an enhancer embedded contributes to the stability of immobilized beads and immobilized effect,with nitrogen removal rate increased by 5%.Immobilized effect of nanomaterials as enhancer is better than activated carbon,with nitrogen removal rate nearly up to 85%,and the best enhancer embedding ratio of activated carbon and nano-materials as 5:4.Generally speaking,nitrogen removal rate of Strain qy37 immobilized in absorbent materials is higher than that in entrapping materials.
【Fund】: 国家自然科学基金项目(50678085;50878107);; 青岛大学优秀研究生学位论文培育项目(YSPY2009014)
【CateGory Index】: X703
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