摘要
采用动态土柱试验,研究了纳米零价铁以及去离子水作用下,多种土壤与总Cr、Cr(Ⅵ)、Cr(Ⅲ)的洗出量规律。试验表明:土壤中包含的Cr在径流作用下,其洗出质量浓度与累积量在不同的洗出阶段表现出差异化特征。洗出效应集中于V_B(流出液体积)为0~1.5L区间。土壤有机质含量较高时,增强了对总Cr的吸附效应,其洗出总Cr质量浓度上升较慢。当有机质质量分数由0.24%增至11.40%时,V_B=2L时的nZVI洗出总Cr累积量减小了0.716mg.对于有机质质量分数为0.24%~11.40%的土壤,nZVI反应体系对Cr(Ⅵ)污染的土壤都具有较好的治理效果。研究中以R_(1.5)、R_6值明确了典型区间的洗出总Cr累积量占预装总Cr总量的比例;以表观Cr(Ⅲ)吸附量等指标,对洗出过程中Cr(Ⅵ)的降解分离状态进行了量化界定,对土壤重金属治理技术具有重要的参考价值。
A dynamic soil column test was conducted to study the leaching pattern between various soils and Cr（total）,Cr（Ⅵ）and Cr（Ⅲ）,under the action of nanoscale zero-valent iron and deionized water.According to the results,the concentration and accumulation of the Cr in soil under the water runoff differ in different stages of washing.The washout effect lies between 0～1.5 Lchiefly.When organic matter content of the soil is high,the adsorption effect on Cr（total）is enhanced,and the concentration of Cr（total）increases slowly.When the organic matter content increases from 0.24% to 11.40% ,the total amount of Cr（total）that is washed out by nZVI decreases by 0.716 mg at 2 L.For the soil with organic content of 0.24% ～11.40% ,the nZVI reaction system has good treatment effect on Cr（Ⅵ）contaminated soil.In this paper,R1.5 and R6 values are used to define the proportion of the accumulation amount of the washout Cr（total）to the starting Cr within the typical range.With the Cr（Ⅲ）index of apparent adsorption amount,the degradation and separation state of the Cr（Ⅵ）in the washout process is quantitatively defined.The research result in this paper has an important reference value for soil heavy metal treatment technology.
作者
李平
曹青
张弛
张思思
LI Ping1, CAO Qing1, ZHANG Chi2, ZHANG Sisi2(1. College of Chemistry and Chemical Engineering;2. College of Environmental Science and Engineering, Taiyaan University of Technology, Taiyaan 030024, Chin)
出处
《太原理工大学学报》
CAS
北大核心
2018年第3期406-411,共6页
Journal of Taiyuan University of Technology
基金
山西省重点研发计划(20150313002-2
201703D321005)
关键词
土壤
铬
纳米零价铁
还原
吸附
soil
chromium
nano zero valent iron
reduction
adsorption
