Development of a H_2 utilizing In-situ denitrification system used for nitrate-contaminated groundwater.

利用原位反硝化系统开发H_2，用于处理受硝酸盐污染的地下水。

基本信息

批准号：
08650639
负责人：
SAKAKIBARA Yutaka
金额：
$ 1.41万
依托单位：
Gunma University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650639/
关键词：
In-situ purification system Nitrate Groundwater Denitrification Electrode Hydrogen Bioremediation Autotrophic 硝酸イオン

项目摘要

A novel in-situ denitrification systemis proposed for treating nitrate in groundwater in shallow aquifers. In the system, H_2 is used as an electron donor which is produced from water by passing electric current to electrodes embedded in aquifer. Laborratory-scale experiments showed that stable and complete denitrification could be achieved over one year without clogging problem. That is, the Present in-situ denitrification process is suitable for treating polluted groundwater under oligotrophic conditions.To enhance the denitrification rate, the effect of the electrode configurations was investigated. The denitrification rates were affected by the configuration especially when the anode and cathode were installed parallel to the groundwater flow direction because pH in the aquifer was increased by the polarization of electrolytic constituents. On the other hand, a mathematical model describing the in-situ system is developed and compared with the experimental results. The denitrification performances calculated at different electric currents were very similar to experimental results. Finally, apossibility of utilizing natural wind and solar energies were investigated in three case studies. A combined in-situ system with wind (or solar) Power generation is considered feasible in some area in Japan.

提议在浅水含水层的地下水中治疗硝酸盐的一种新型的原位反硝化系统。在系统中，H_2用作电子供体，通过将电流传递到嵌入含水层中的电极来产生。 Laborratory尺度实验表明，可以在不堵塞问题的情况下实现稳定而完全的反硝化。也就是说，目前的原位反硝化过程适用于在贫营养条件下治疗污染的地下水。为了提高反硝化率，研究了电极构型的效果。硝化率受构型的影响，特别是当平行于地下水流动方向平行安装阳极和阴极时，因为电解成分的极化增加了含水层中的pH。另一方面，开发了描述原位系统的数学模型并将其与实验结果进行了比较。在不同电流上计算出的反硝化性能与实验结果非常相似。最后，在三个案例研究中研究了利用自然风和太阳能的可靠性。在日本某些地区，与风（或太阳能）发电的原位系统相结合被认为是可行的。