高效自养型硝化细菌的分离及硝化条件优化

以焦化废水处理系统中的活性污泥为菌源,分离出具有较高硝化能力的自养型硝化细菌Z2。液体培养基中培养4天,菌株Z2的硝化效果可以达到100%。通过在不同温度、初始pH、摇床转速下研究其对菌株Z2硝化效果影响,得到该菌株的最优硝化条件为温度30℃,pH8.0,摇床转速250r/min。不同接种量的研究表明,增大接种量有利于硝化作用的进行。当底物亚硝酸盐氮浓度从101.51mg/L增加到507.55mg/L时,并未抑制该菌株硝化作用的进行。硝化过程中培养体系的pH逐渐增大,在理论上有利于硝化作用的进行。     

基于FPGA的通信原理实验平台研制与应用

通信原理实验是拓展学生自主创新能力和发展的主要教学方式.尤其是基于FPGA的通信原理的实验平台的研制与应用,能够让学生结合最新的变成门列阵,变形或是拓展无线电软件的编程方式.因此,本文主要针对在FPGA为基础的通信原理实验平台研制与应用进行阐述和分析,并且通过加强对通信原理实验平台设计,提高无线电软件的设计和应用.这样能够促进通信原理实验平台的研制和应用具有实用价值.并且为学生研究提供了重要的平台.     

A Modified Co-precipitation Method to Prepare Cu/ZnO/Al<Subscript>2</Subscript>O<Subscript>3</Subscript> Catalyst and Its Application in Low Temperature Water-gas Shift (LT-WGS) Reaction

A modified co-precipitation method for the production of Cu/ZnO/Al₂O₃ complex was studied. The modification was that part of Al was introduced by adding Al³⁺ into Cu²⁺/Zn²⁺ solution, and the rest of Al was added after co-precipitation step in the form of pseudo-boehmite. The prepared samples were characterized by different techniques such as X-ray diffraction, N₂ adsorption, H₂-N₂O titration, temperature programmed reduction and scanning electron microscopy. X-ray diffraction characterizations revealed that Al³⁺ can be doped in aurichalcite lattice, and the maximum doping amount of Al³⁺ was 5.0% of total Cu and Zn atoms. The Cu/ZnO/Al₂O₃ sample produced by the modified method, in which co-precipitated Al³⁺ was 2.5% of total Cu and Zn atoms showed much better activity and stability in water-gas shift reaction than commercial sample. The high Cu surface area (26.1 m²/g) obtained by decompositon of doped aurichalcite is believed to be responsible for the activity enhancement. The stability was enhanced mainly because of the support effect of γ-Al₂O₃, which was decomposed from pseudo-boehmite in the calcination step.     

浅谈循环氢气活性炭吸附性能下降原因及再生工艺

尾气回收活性炭吸附柱内逐渐积累氯硅烷、HCl和B、P等杂质,导致碳吸附塔中活性炭的吸附性能降低,从而影响循环氢气纯度和成品质量,结合活性炭吸附柱的穿透曲线,调研了活性炭的再生工艺。     

A Modified Co-precipitation Method to Prepare Cu/ZnO/Al_2O_3 Catalyst and Its Application in Low Temperature Water-gas Shift(LT-WGS) Reaction

A modified co-precipitation method for the production of Cu/ZnO/Al_2O_3 complex was studied. The modification was that part of Al was introduced by adding Al~(3+) into Cu~(2+)/Zn~(2+) solution, and the rest of Al was added after co-precipitation step in the form of pseudo-boehmite. The prepared samples were characterized by different techniques such as X-ray diffraction, N_2 adsorption, H_2-N_2O titration, temperature programmed reduction and scanning electron microscopy. X-ray diffraction characterizations revealed that Al~(3+) can be doped in aurichalcite lattice, and the maximum doping amount of Al~(3+) was 5.0% of total Cu and Zn atoms. The Cu/ZnO/Al_2O_3 sample produced by the modified method, in which co-precipitated Al~(3+) was 2.5% of total Cu and Zn atoms showed much better activity and stability in water-gas shift reaction than commercial sample. The high Cu surface area(26.1 m~2/g) obtained by decompositon of doped aurichalcite is believed to be responsible for the activity enhancement. The stability was enhanced mainly because of the support effect of γ-Al_2O_3, which was decomposed from pseudo-boehmite in the calcination step.     

异养硝化菌的分离及脱氮特性研究

从活性污泥中分离得到异养硝化菌株Y1,该菌的最优硝化条件：C／N为9．6,温度为30％,初始pH为9．0,摇床转速为250r／min。在此条件下,初始浓度为152．88mg／L的氨氮经8h降解后浓度降低到4．02mg／L,硝化过程中未发现中间产物亚硝酸氮和硝酸氮积累。菌株Y．不仅具有异养硝化作用,还能以硝酸氮作为唯一氮源进行好氧反硝化作用,40h内对初始浓度为196mg／L的NO3--N降解率为99．05％。     

DBP降解菌的降解动力学及代谢途径研究

以实验室保存的1株Elizabethkingia sp.W8为研究对象,对其降解DBP的条件、动力学特性及代谢途径进行了研究。结果表明,该菌株的较优生长条件为：温度35℃,pH=7.0,盐浓度0.5%。当DBP的初始浓度介于50～400mg/L时,该菌株对DBP的降解符合Monod一级反应动力学模型。红外光谱分析结果显示,W8对邻苯二甲酸二丁酯的降解很可能为DBP→MBP→PA代谢路径。