菌株qy37吸附包埋固定化的脱氮效果研究

Denitrification Effect of Heterotrophic Nitrifying and Aerobic Denitrifying Bacteria Strain qy37 Immobilized in Absorbent and Entrapping Materials

以对异养硝化好氧反硝化菌菌株qy37固定化后的脱氮效果为考察标准,分别研究了不同的吸附、包埋固定化载体和方式对固定化脱氮效果的影响。研究结果表明:以碳纳米管、多孔陶粒、活性炭、石墨四种材料为吸附固定化载体时,纳碳纳米材料的吸附固定化脱氮效果最好,脱氮率可达94%;以海藻酸钠(SA)和聚乙烯醇(PVA)制成的SA、PVA、PVA-SA、PVA-SA-活性炭和PVA-SA-纳米材料小球为包埋固定化载体时,PVA和SA混合作为包埋剂固定效果要好于单独作为包埋剂,包埋剂PVA和添加剂SA最佳包埋比是10:1;吸附材料作为强化剂一起包埋的复合式包埋有助于提高固定化小球的稳定性和固定化效果,脱氮率提高5%。其中纳米材料作为强化剂的包埋固定化脱氮效果要优于活性炭,脱氮率可达到85%。强化剂活性炭、纳米材料最佳包埋比是5:4。吸附固定化整体脱氮效率优于包埋固定化。

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.