直流电

发布时间：2019-01-22 11:42

【摘要】：土壤中Cd污染问题日益严峻,严重影响了人类生活。因此对Cd污染土壤的修复研究已然成为热点之一。本研究采用盆栽试验,将植物修复技术与电动修复技术相结合,通过不同电压梯度、通电时间、电场方向、施用添加剂等因素探究了直流电场-东南景天联合修复Cd污染土壤的最优条件与效果。主要结果如下:(1)在试验条件下直流电场对东南景天生长具有促进作用,在电压梯度为1.0 V/cm及通电时间6 h/d处理下的东南景天生物量最高,交换电场方向对东南景天生物量影响较小。并且在两类不同土壤中的东南景天生物量相近。(2)直流电场作用下,东南景天地上部Cd吸收量有显著增加。其中电压梯度为1.0 V/cm,通电时间6 h/d,电场方向两天交换处理下的东南景天Cd吸收量最高,达到90.6μg/株。而在不交换电场方向下,东南景天Cd吸收量有所降低。在两类供试土壤中,当在无电场作用下,东南景天Cd吸收量无差异;而在直流电场作用下,Cd轻度污染的温州土中的东南景天Cd吸收量显著高于Cd重度污染的富阳土中的东南景天Cd吸收量。(3)在不同添加剂(EDTA、腐殖酸、有机肥)与电场联合作用对东南景天吸收Cd的作用不同。EDTA作为添加剂,对土壤Cd有效性提升58.35%,并且强化了东南景天吸收土壤Cd的能力。当施加电场与EDTA共同作用时,东南景天Cd吸收效果优于不施加电场处理下,单株东南景天Cd吸收量分别为56.9μg/株(不施加电场)、69.0μg/株(施加电场)。腐殖酸作为添加剂的处理中,土壤中Cd有效态含量略有提升,并且东南景天Cd吸收量显著提升,单株东南景天Cd吸收量分别为68.6μg/株(施加电场)、48.1μg/株(不施加电场),但东南景天生物量受腐殖酸抑制低于对照(无添加剂)处理。有机肥作为添加剂的处理中,东南景天生物量显著提高,但对土壤中Cd有效性并无提升作用。但是施加电场与有机肥共同处理下的东南景天Cd吸收量与不施加电场处理间无显著差异。
[Abstract]:The problem of Cd pollution in the soil is becoming more and more serious, and the human life is seriously affected. Therefore, the research on the remediation of Cd-contaminated soil has become one of the hot spots. In this study, a pot experiment was used to combine the plant repair technology with the electric restoration technology, and the optimum conditions and effects of the combined repair of Cd-contaminated soil by DC-SE-SE were investigated by means of different voltage gradient, power-on time, direction of electric field, application of additive and so on. The main results are as follows: (1) Under the condition of the test, the DC field has a catalytic effect on the growth of the southeast, and the biomass of the southeast is the highest under the treatment of the voltage gradient of 1.0 V/ cm and the power-on time of 6 h/ d, and the direction of the exchange electric field is less influenced by the biomass of the southeast. and the biomass in the southeast of the two types of different soil is similar. (2) The Cd absorption in the upper part of the southeast view is significantly increased under the action of the direct current field. in which the voltage gradient is 1.0 V/ cm, the power-on time is 6 h/ d, and the absorption of Cd in the south-east region under the two-day exchange treatment in the electric field direction is the highest, reaching the 90-6.mu. g/ strain. In the direction of non-exchange of electric field, the absorption of Cd in the southeast is reduced. In the two types of test soil, the absorption of Cd in the south-east was not different under the action of no electric field, and the amount of Cd in the south-east of the Wenzhou soil which was slightly polluted by Cd was significantly higher than that of the Cd in the south-east of the heavy-polluted soil. (3) The effect of combination of different additives (EDTA, humic acid, organic fertilizer) and electric field on the absorption of Cd in the southeast is different. As an additive, the efficiency of Cd in the soil was increased by 58. 35%, and the ability of the soil Cd to be absorbed in the southeast was enhanced. When the electric field was applied to the EDTA, the Cd absorption in the southeast was superior to that of the non-applied electric field, and the Cd absorption in the southeast of the single plant was 569.mu. g/ strain (no electric field applied), and 69.0. m u.g/ strain (applied electric field). In the treatment of the humic acid as an additive, the content of Cd in the soil increased slightly, and the amount of Cd in the southeast was significantly increased, and the Cd absorption in the southeast of the plant was 68. 6. mu. g/ strain (applied electric field), and 48. 1. m but the biomass in the southeast is controlled by the humic acid to be lower than that of the control (no additive). In the treatment of the organic fertilizer as an additive, the biomass of the southeast plant is obviously improved, but the efficiency of the Cd in the soil is not promoted. However, there was no significant difference between the absorption of Cd in the southeast and the treatment of the non-applied electric field under the co-treatment of the electric field and the organic fertilizer.
【学位授予单位】：浙江农林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X53

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