【作者】 吴未红；

【导师】 袁兴中； 曾光明；

【作者基本信息】 湖南大学 ， 环境工程， 2005， 硕士

【摘要】 电极-生物膜法（bio-electrode）脱氮结合了生物法和电化学法的各自的优点,可以实现清洁、彻底的反硝化脱氮。 木文简介了电极-生物膜法脱氮的国内外的研究过程和研究成果,介绍了该技术的最新的研究进展,并总结了目前研究中存在的问题,提出了以后的进一步的研究方向。 本文讨论了用电极-生物膜处理地下水中硝酸盐氮的方法,得到了该方法的最佳工艺条件,即C/N比为3,温度35℃,电流100mA,HRT8h。研究了该方法对不同进水负荷的处理能力,发现在进水硝酸氮负荷≤30mg/L时,在HRT8h内均可取得93%以上的总氮去除率。同时,经实验得到应用时的最经济碳氮比（C/N=1.07）。最后通过实际地下水的实验验证,确定该方法可以非常有效的去除地下水中的硝酸盐氮。 本文初步研究了电极-生物膜反应器对水中的硝酸氮、铜离子的去除及酸性废水的中和。反应器的阳极和阴极都采用碳电极,将反硝化微生物固定在阴极表面,并对其进行通电及铜离子驯化。为寻求电极-生物膜法脱氮的特性,以电流强度I、C/N比、Cu²⁺浓度及HRT为反硝化作用的影响因素进行实验。结果表明:在T=35℃、I=100mA、C/N=1.07、HRT=11h条件下反应器具有良好的总氮去除效果（可达90%以上）。一定浓度的铜离子对反硝化具有明显的抑制作用,可产生滞后现象,并影响总氮去除率。但经驯化后,反硝化率又会恢复而不受铜离子浓度变化的影响。流经阴极的电流被用于铜离子的去除及氢气的产生。这个反应可同步实现铜离子的去除和反硝化的进行,并由于反硝化作用及无机碳物质的生成,可将酸性废水的pH值凋节至中性。当废水中的C/N比小于1.07（理论C/N）时,电极-生物膜反应器能同时将硝酸氮和COD完全去除。最后,经电极反相实验,可将通过电化学还原析出的单质铜通过交换电极的方式回收,使整个反应体系可以持续有效地进行。这些结论证明,通过电极-生物膜法可达到铜离子和COD去除、反硝化及中和作用的同步实现。更多还原

【Abstract】 The bio-electro process combined the strongpoints of electro-chemical method and biology method. The complete and cleanly denitrification can be realized by this process. In this paper, the research findings and up-to-date research progress were introduced. The problems in the recent research were also summarized, and the developing trend of the technology were discussed in the end.Application of a bio-electrode reactor for treatment of nitrate polluted groundwater was investigated experimentally in this paper. The range of the optimum process condition was studied. When temperature was 35℃, the electric current was 100mA, the C/N concentration ratio was 1.07, and the hydraulic retention time(HRT) was 8 hour, a higher effect of nitrate removal ratio iwas achieved. For the treatment of nitrate polluted groundwater with different concentration, it had been found the bio-electrode reactor had a higher nitrate removal ratio more than 93% when the polluted water containing nitrate concentration less than 30mg/L at 8 hour of HRT and the C/N ratio of 1.07 was the most economical C/N ratio. At last, it was confirmed that a higher TN(total nitrogen)removal ratio more than 99% can be achieved to the nitrate polluted groundwater of Changsha region by experiment with groundwater.Application of a bio-electrochemical reactor for denitrification and neutralization treatment by direct feeding of an acidic wastewater containing copper ion and high-strength nitrate was investigated experimentally in this paper. Carbon electrodes were installed in the reactor as the anode and cathode, and denitrifying microorganisms were fixed on the surface of the cathode which were acclimatized to 100 mA of electric current and 5mg/L of Cu2+ subsequently. In order to find the characteristic of denitrification, a series of separate experiments were carried out at a constant HRT , but different with electric current , Cu2+ and C/N. It can be concluded that an effective removal of total nitrogen(TN) was achieved (TN removal was more than 90%) under the condition of T=35℃, 1=100mA, C/N=1.07, HRT=11h. The copper ions that remained in the reactor may have negative effect on denitrification, and it led to the appearance of lag time before denitrification strated and a decrease of maximum removal of TN. After some adaptation period, denitrification could proceed effectively regardless of the variation of copper ion concentration. The electric current that passed更多还原