摘要
明确氧化剂需求量是实施土壤氧化修复技术的前提。氧化剂需求量受到土壤有机质含量和黏土矿物组成的影响。有机质和黏土矿物是构成土壤团聚体的重要组分,不同类型的土壤,其团聚体结构存在较大差异。然而,土壤团聚体对氧化剂需求量的影响尚不明确。作者采集了全国15个城市的土壤,以碱活化过硫酸钠为氧化剂,通过氧化试验,探究土壤团聚体组成及有机质含量对氧化剂需要量(SOD)的影响。结果表明,土壤中70%的土壤总有机碳(SOC)主要存在于微团聚体(<250μm)中。SOD与不仅与SOC显著正相关,还与土壤3个不同团聚体(2 000~250μm、250~53μm和<53μm)中的SOC也显著正相关(P<0.05),且团聚体粒径越小,显著性越高。因此,土壤有机质含量,特别是微团聚体中的有机质含量是影响氧化剂使用量的关键因子。该结果可以为氧化剂的使用剂量提供参考依据,促进氧化修复技术的高效实施。
15 soils were sampled in the present study to investigate the content of soil organic carbon(SOC)and soil aggregates,on the soil oxidant requirement(SOD)that used in the chemical oxidation remediation technology.Alkali-activated sodium persulfate was selected as the oxidant.The result showed that microaggregates(<250μm)contained 70%of SOC.A significant positive correlation was found between the value of SOD and the content of SOC of the bulk soil.Furtherly,SOD was positively correlated with SOC content of three different aggregates of soils(2000~250μm,250~53μm and<53μm),and the smaller the soil aggregates,the higher the significance value.Therefore,the SOC content,especially which in microaggregates was the key factor influencing the value of SOD.The results here could be useful for selection of the oxidant dosage and could also promote the efficiency oxidation remediation technology.
作者
曾跃春
闫志梅
李增波
王聪颖
ZENG Yuechun;YAN Zhimei;LI Zengbo;WANG Congying(Jiangsu DDBS Environmental Remediation Co.,Ltd.,Nanjing 210008,China;School of Environment and Resources,Shanxi University,Taiyuan 030006,China;School of Chemical and Biological Engineering,Taiyuan University of Science and Technology,Taiyuan 030021,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2024年第7期84-90,共7页
Environmental Science & Technology
基金
山西省自然科学基金面上项目(20220302121322)
国家重点研发计划项目(2018YFC1802005)。
关键词
土壤有机污染修复
土壤氧化剂需要量
土壤理化性质
土壤总有机碳
团聚体
remediation of soil organic pollution
soil oxidant requirements
soil physicochemical properties
total soil organic carbon
aggregates
