利用电动力学方法向土壤注入无机盐研究

研究了利用电动力学向土壤注入无机盐过程中,电极运行方式、电压和注入时间对营养盐分布的影响。结果表明,采取变换电场方向的运行方式,更有利于电场中营养盐的均匀分布。通过电动注入的方式,可以在较短时间(24～36h)内向土壤中有效引入硫酸盐,且随着时间的延长,硫酸根在土壤中的浓度不断提高。由于电场可导致不同氮形式间的转化,引起含氮营养盐有效形态的流失,因此电动注入硝酸盐的时间不宜过长,在72 h内为佳。同时,由于硝酸根迁移速度较快,因此为保证硝酸盐在土壤中的浓度,0.5 V/cm电压梯度的效果较好。

Study on injection of inorganic salts into soil by electrokinetic method

The impacts of electrode manipulation pattern, voltage and time on the distribution of inorganic salts during the electrokinetic injection into soils were studied. The results showed that the inorganic salts were distributed more uniformly when the electric field reversed its direction periodically. The electrokinetic method could inject sulfate into soils effectively in a short period (24~36 h), and the concentration of the sulfate ion increased with time. The loss of effective N-containing nutrients occurred due to the complex transformations between different species of N in electric field. Thus, the injection time for nitrate ion should not be too long, better less than 72 h. In order to keep N-concentration at a high level in soils, the potential of 0.5 V/cm is considered to be appropriate since nitrate moves more quickly.