电动修复去除沙质土壤中多种重金属污染物

发布时间：2018-04-02 13:04

本文选题：土壤修复　切入点：电动修复技术　出处：《安徽理工大学》2017年硕士论文

【摘要】：土壤重金属污染是环境污染防治领域的重要研究方向之一,传统的修复技术工程量大、易产生二次污染。本研究采用原位电动修复技术去除受多种重金属污染沙质土壤中的锌(Zn)、铬(Cr)、铜(Cu)、镍(Ni)、铅(Pb)、镉(Cd)六种重金属污染物,选取泰兴某处受化工厂固体废弃物污染的土壤区域为实验场地,以场地内50-150 cm范围内土壤重金属为实验对象。在实验过程中,对电极电流、电解液参数(pH值、电导率、氧化还原电位和温度)和修复前后土壤中六种重金属污染物含量进行监测分析。结果证明,电动修复技术对沙质土壤中六种重金属具有非常好的去除成效,土壤在50-100 cm深度范围内重金属去除率分别为:Zn(57.7%)、Cr(60.5%)、Cu(67.2%)、Ni(42.7%)、Pb(32.2%)、Cd(75.0%);在100-150cm范围内重金属去除率分别为:Zn(94.3%)、Cr(71.9%)、Cu(82.9%)、Ni(35.6%)、Pb(81.1%)、Cd(68.4%);电极电流随着修复时间增加而逐渐增大,直至平稳;2个月的设备能耗为8164.74 kW·h,用电费用为6531.79元;电解液pH值和温度在正常范围内波动,氧化还原电位基本为正值;不同电极电解液电导率随修复时间的增加,阴极电解液电导率先增大后稳定,阳极总体保持稳定。该研究为重金属污染土壤的电动修复工程应用提供了一定的参考,该技术修复效果好、时间短、工程量小,具有十分广泛的应用前景。
[Abstract]:Soil heavy metal pollution is one of the important research directions in the field of environmental pollution prevention and control. It is easy to produce secondary pollution. In this study, in situ electrokinetic remediation technique was used to remove six kinds of heavy metal pollutants from sandy soils contaminated by many heavy metals, such as Zn ~ (2 +), Cr ~ (2 +), Cr ~ (2 +), Cu ~ (2 +), Ni ~ (2 +), Pb ~ (2 +), CD ~ (2 +) ~ (2 +). The soil area contaminated by solid waste of chemical plant in Taixing was selected as the experimental site, and the heavy metals in the soil in the range of 50-150 cm were selected as experimental objects. During the experiment, the electrode current, electrolyte parameters, pH value and conductivity were measured. The redox potential and temperature) and the contents of six heavy metal pollutants in soil before and after remediation were monitored and analyzed. The results show that the electrokinetic remediation technology has a very good effect on the removal of six heavy metals in sandy soil. In the range of 50-100 cm, the removal rates of heavy metals in the soil are respectively:% ZnZn 57.7cm, 60.5%. The electrode current increases gradually until the repair time increases, and the removal rate of heavy metals in the range of 100-150cm is 8164.74 kW / h, the cost is 6531.79 yuan respectively, and the electrode current increases gradually until the recovery time increases, and the energy consumption of the equipment increases to 6531.79 yuan (RMB) for 2 months, and the removal rate of heavy metals in the soil is 77.77.7cm / cm, respectively, and the electrode current increases gradually until the repair time increases, and the cost of the equipment is 6531.79 yuan (RMB), respectively, for the removal rate of heavy metals in the range of 50-100 cm. The removal rates of heavy metals in the soil are as follows: (1) in the 100-150cm range, the removal rates of heavy metals are: (1) the removal rate of heavy metals in the soil is 57.77.7cm in depth, and the removal rates of heavy metals in the soil are as follows: 1. The pH and temperature of electrolyte fluctuated in the normal range, and the redox potential was basically positive. The conductivity of different electrode electrolyte increased first and then stabilized with the increase of repair time. The study provides a reference for the application of electrically operated remediation of heavy metal contaminated soil. The technology has a good effect, short time, small amount of engineering, and has a very wide application prospect.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X53

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