• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Pilot-scale study on in situ electrokinetic removal of nitrate from greenhouse soil
【24h】

Pilot-scale study on in situ electrokinetic removal of nitrate from greenhouse soil

机译：温室土壤原位电动去除硝酸盐的中试研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In greenhouses, excessive nutrients generally accumulate in the soil, which may induce adverse effects on crop yield and quality. In situ electrokinetic (EK) tests were conducted on a pilot-scale to remove nitrate from greenhouse soil for 64 days using a specially designed electrode module. When a pair of electrodes was installed horizontally in the furrows (EK pilot test I), a significant amount of nitrate was removed by electromigration towards the anode although the electroosmotic flow was not obtained. In the other test (EK pilot test II), where two anodes and one cathode were placed in the furrows and under the ridge, respectively, the efficiency of nitrate removal was comparable with that in the EK pilot test I. However, the removal pattern was asymmetric with respect to the cathode because soil heterogeneity affected the main transport mechanism, electromigration or electroosmosis, depending on location. After the EK treatment the overall efficiency of the nitrate removal was >90% in both tests. The main cation, K~+ was also removed, and thereby the electrical conductivity of the soil was reduced up to 87%. The energy consumed for the EK pilot test I operation was much lower than that used in the EK pilot test II. During the EK tests, indigenous nitrate reducing bacteria were introduced to enhance nitrate biodegradability but the effect of bio-augmentation was insignificant. From the results it can be concluded the EK technology is feasible to remove salts from greenhouse soils and the EK pilot system I is more applicable to greenhouse soil remediation. However, there is still a room for improvement to achieve a successful field application.
机译：在温室中，土壤中通常会积累过多的养分，这可能会对作物的产量和质量产生不利影响。使用专门设计的电极模块，以中试规模进行原位电动（EK）测试，以去除温室土壤中的硝酸盐达64天。当将一对电极水平安装在犁沟中时（EK试验I），尽管未获得电渗流，但通过向阳极的电迁移去除了大量的硝酸盐。在另一项试验（EK中试II）中，两个阳极和一个阴极分别放置在犁沟和山脊下方，硝酸盐的去除效率与EK中试I相当。但是，去除方式相对于阴极是不对称的，因为土壤异质性影响了主要的迁移机制，即电迁移或电渗，具体取决于位置。在两个测试中，EK处理后，硝酸盐去除的总效率均> 90％。还去除了主要阳离子K +，从而使土壤的电导率降低了87％。 EK先导测试I的运行能耗远低于EK先导测试II的能耗。在EK试验中，引入了原生硝酸盐还原菌以增强硝酸盐的生物降解性，但生物增强作用微不足道。从结果可以得出结论，EK技术可用于去除温室土壤中的盐分，而EK试验系统I更适用于温室土壤修复。但是，要实现成功的现场应用仍存在改进的空间。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号