摘要
为了说明脉冲放电等离子体修复体系中的主要参数对有机污染土壤修复效果的影响规律,以芘这一典型的多环芳烃持久性有机污染物为目标物,建立了针对芘污染土壤的针–网式脉冲放电等离子体修复体系,考察了主要土壤参数包括土壤粒径、土壤初始p H值、土壤初始含水体积分数、土壤中芘初始质量分数的变化对土壤中芘降解速率的影响规律。研究结果表明:1 mm粒径土壤中的芘降解速率常数比2 mm粒径土壤中的芘降解速率常数高;土壤初始p H值是影响脉冲放电等离子体修复体系中土壤修复效果的关键因素,酸性土壤比中性和碱性土壤更利于其中芘的降解,酸性土壤条件下的芘降解速率常数为0.059 76;土壤初始含水体积分数增加导致土壤孔隙减少,不利于活性物质的传输而降低了修复效果;随着土壤中芘初始质量分数的增加,芘降解速率常数降低。
In order to understand the role of several main parameters of pulsed discharge plasma remediation system in the remediation effect of organic-compound-polluted soil, we set up a remediation system using multi-needle-to-net elec- trodes to treat pyrene （one of the typical polycyclic aromatic hydrocarbons） in soil, and obtained the relation of the soil＇s particle diameter, initial pH value, initial water volume fraction, and initial mass fraction of pyrene, on the pyrene degra- dation rate of the treated soil. The results show that the degradation rate constant of pyrene in soil of 1-mm-diameter particles is higher than that of 2-ram-diameter particles. The initial pH value of the soil plays a key role in the remediation, and acidic conditions are more advantageous to the degradation of pyrene than neutral and basic conditions. For instance, the degradation rate constant of pyrene in soil with pH value of 4 is 0.059 76. Increasing the initial water volume fraction of soil decreases the pores in soil, which goes against the transfer of active species in the reaction system and lowers the re- mediation efficiency. With the increase of mass concentration of pyrene, the degradation rate constant of pyrene declines.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2015年第10期3512-3517,共6页
High Voltage Engineering
基金
国家自然科学基金(21207052)~~
关键词
脉冲放电等离子体
芘
土壤粒径
土壤初始p
H值
土壤初始含水体积分数
芘初始质量分数
pulsed discharge plasma
pyrene
soil particle diameter
initial pH value of the soil
initial water volume fraction of the soil
initial mass fraction of pyrene
