%0 Journal Article
%T Movement and Transformation of Nitrate in Soil by Non-uniform Electrokinetics<br>土壤中硝酸盐在非均匀电动力学作用下的迁移与转化
%A LUO Qi shi
%A WANG Hui
%A ZHANG Xi hui
%A QIAN Yi
%A <br>罗启仕
%A 王慧
%A 张锡辉
%A 钱易
%J 环境科学
%D 2004
%I 
%X Movement and accumulation of nitrate in soil and groundwater has become a serious threat in many cities and agricultural areas. At the same time, application of nitrate as bacterial nitrogenous nutrient in the in-situ bioremediation of some organics-polluted sites is often required. Laboratory experiments were conducted to examine the feasibility of using non-uniform electrokinetics (NUEK) to control the movement of nitrate in unsaturated soil-water system. A natural soil taken from woodland was used as experimental soil. Three electrokinetic processes were tested in bench-scale cells at a constant potential gradient of 1.0 V/cm: unidirectional NUEK, NUEK with periodic polarity-reversal, and conventional uniform electrokinetic (UEK). The tests showed that NUEK drove NO3- through the experimental soil at a rate of 13.5-20 cm/d depending upon the concentration of NO3- and the distribution of electric field density. Compared with UEK, NUEK process more effectively concentrated and retained NO3- close to the anode. Moreover, NUEK process maintained soil characteristics and consumed much less electric energy. Reversal the polarity of NUEK weakened the concentration of NO3- to electrodes, but it stimulated the transformation of NO3- to NO2- and further lowered the electric energy consumption.
%K non uniform electrokinetics
%K nitrate
%K movement
%K transformation
%K soil<br>非均匀电动力学
%K 硝酸盐
%K 电迁移
%K 转化
%K 土壤
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=9BA7DBC37E33B258&yid=D0E58B75BFD8E51C&vid=C5154311167311FE&iid=0B39A22176CE99FB&sid=10F298ED9F164662&eid=89F76E117E9BDB76&journal_id=0250-3301&journal_name=环境科学&referenced_num=16&reference_num=13