Fan Guang-Ping, Cang Long, Zhou Dong-Mei, Zhou Li-Xiang
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Huan Jing Ke Xue. 2011 Nov;32(11):3435-9.
The effect of different soil types (red soil,yellow-brown soil and black soil) on the electrokinetic (EK)-oxidation remediation of heavy metals-organic pollutant contaminated soil was studied in laboratory-scale experiments. Copper and pyrene were chosen as model pollutant, and 12% H2O2, 10% hydroxypropyl-beta-cyclodextrin and 0.01 mol x L(-1) NaNO3 solution were added into the anode and cathode cell. The applied voltage was 1 V x cm(-1). After 15 days of EK remediation, the removal rate of pyrene and copper in red soil, yellow-brown soil and black soil were 38.5%, 46.8%, 51.3% for pyrene and 85.0%, 22.6%, 24.1% for Cu, respectively. The high pH of black soil produced high electroosmotic flow and increased the exposure of oxidants and pollutants, meanwhile the low clay content was also conducive to the desorption of pyrene. The low pH and organic matter of red soil affected the chemical species distribution of Cu and increased its removal rate. It is concluded that soil pH, clay content and heavy metal speciation in soil are the dominant factors affecting the migration and removal efficiency of pollutants.
通过实验室规模的实验，研究了不同土壤类型（红壤、黄棕壤和黑土）对重金属 - 有机污染物污染土壤电动（EK）氧化修复的影响。选择铜和芘作为模型污染物，并在阳极和阴极池中加入12%的H2O2、10%的羟丙基 - β - 环糊精和0.01 mol·L(-1)的NaNO3溶液。施加电压为1 V·cm(-1)。经过15天的EK修复后，红壤、黄棕壤和黑土中芘的去除率分别为38.5%、46.8%、51.3%，铜的去除率分别为85.0%、22.6%、24.1%。黑土的高pH值产生了高电渗流，增加了氧化剂和污染物的暴露，同时低粘土含量也有利于芘的解吸。红壤的低pH值和有机质影响了铜的化学形态分布并提高了其去除率。研究得出结论，土壤pH值、粘土含量和土壤中重金属形态是影响污染物迁移和去除效率的主要因素。
