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过硫酸钠对我国典型土壤中多环芳烃氧化降解效果
邸莎,张超艳,颜增光,白利平,周友亚,王学东,李发生,等
作者单位E-mail
邸莎 首都师范大学资源环境与旅游学院 dishafighting@126.com 
张超艳 中国环境科学研究院环境基准与风险评估国家重点实验室  
颜增光 中国环境科学研究院环境基准与风险评估国家重点实验室  
白利平 中国环境科学研究院环境基准与风险评估国家重点实验室  
周友亚 中国环境科学研究院环境基准与风险评估国家重点实验室 zhouyy@craes.org.cn 
王学东 首都师范大学资源环境与旅游学院  
李发生 中国环境科学研究院环境基准与风险评估国家重点实验室  
摘要:
过硫酸钠是污染土壤化学氧化修复技术中应用较为广泛的氧化剂。为研究过硫酸钠对不同土壤中PAHs(polycyclic aromatic hydrocarbons,多环芳烃)的修复效果,以我国多种典型土壤(黑土、潮土、黄土、紫色土、褐土、砖红壤)为实验样本,以萘、菲、蒽、芘、苯并[a]芘五种PAHs为目标污染物,分析活化过硫酸钠对人为老化的降解率;此外,通过对氧化前后土壤pH 、w(有机碳)等土壤性质变化的比较和分析,探讨氧化修复过程对土壤性质的影响。结果表明:当活化过硫酸钠用量为0.8 mmol/g、温度为25 ℃、pH为6~7时,PAHs污染土壤中萘、菲、蒽、芘、苯并[a]芘的降解率最高,分别为87.82%、79.68%、87.93%、83.4%、94.31%;w(有机碳)越低,PAHs环数越高,PAHs降解率越高;高环(5~6环)、中环(4环)、低环(2~3环)PAHs降解率与总PAHs降解率变化趋势一致。此外,过硫酸钠氧化修复后土壤结构遭到一定程度的破坏,土壤的pH、w(有机碳)和土壤肥力会有不同程度地下降,对土壤的再次利用有较大影响。研究可对修复后的土壤管理和再利用提供理论依据,对推动和践行可持续修复具有重要意义。研究显示,过硫酸钠可有效氧化降解不同性质土壤中PAHs,在氧化修复PAHs污染土壤方面具有较好的应用前景。
关键词:  多环芳烃  过硫酸钠  修复
DOI:
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目),北京市教育委员会科技计划项目
Oxidative Degradation Effect of Sodium Persulfate on Polycyclic Aromatic Hydrocarbons in Typical Chinese Soils
DiSha,ZhangChaoyan,YanZengguang,BaiLiping,ZhouYouya,WangXuedong,LiFasheng,et al
Abstract:
Sodium persulfate has been widely used as an oxidant in the oxidation remediation of contaminated soils. To study the oxidative degradation effect of sodium persulfate in different kinds of soils, various soils, including black soil, fluvo-aquic soil, yellow soil, purple soil, cinnamon soil, and humid-thermo ferralitic were used in this work. Those soils were artificially contaminated by PAHs (polycyclic aromatic hydrocarbons), such as naphthalene (NAP), phenanthrene (PHE), anthracene (ANT), pyrene (PYR) and benzo[a]pyrene (BaP). The remediation efficiency of artificially aging PAHs contaminated soils oxidized by activated sodium persulfate was studied under optimum experimental conditions. The comprehensive assessment of remediation efficiency was assessed by comparing and analyzing the soils’ properties, including pH and organic carbon content. The results showed that the oxidation degradation rate of NAP, PHE, ANT, PYR and BaP got their top levels as 87.82%, 79.68%, 87.93%, 83.4% and 94.31%, respectively, when the soil pH was set at 6-7. The PAHs contaminated soil with low organic carbon content and high cation exchange capacity had high oxidation degradation efficiency. The high rings PAHs (5-6 carbon rings), the middle rings PAHs (4 carbon rings), the low rings PAHs (2-3 carbon rings)and the total PAHs shared the same degradation trend, but the PAHs with more rings showed higher degradation efficiency. Otherwise, the soils’ properties were damaged to some extent after being oxidized by sodium persulfate. For example, the soils’ pH lowered slightly and the organic carbon content and the fertility of soil declined sharply, which might affect the reuse of the remediated soils. This work can provide theoretical basis for soil management and reuse after restoration, which is of great significance to promote and practice sustainable restoration. This work indicates the fantastic potential of sodium persulfate applied as oxidant in contaminated soil remediation.
Key words:  PAHs, per-sulfate, repair