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Fenton氧化技术处理稠油污染土壤

Keywords: Fenton氧化,稠油污染土壤,原油四组分,生物修复

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Abstract:

利用Fenton氧化技术对稠油污染土壤进行氧化处理,分析对后续微生物修复的促进作用。向1000g石油类含量为8%的稠油污染土壤中加入10.0mL18mmol/LFe2+溶液与10.0mL30%H2O2,反应时间为2h。氧化处理后土壤中石油烃的总去除率可达到31.38%,胶质去除率为45.22%,沥青质去除率为51.26%,胶质的分子量由1841下降到1472,沥青质的分子量由5831下降到5073。Fenton氧化可使土壤酶活、各类微生物的数量及呼吸强度有不同程度的下降,但在氧化后30d内,土壤各类微生物数量都超过了原有水平,其中细菌数量最高达到9.84×105CFU/g,是氧化前的数量的1.57倍。以上实验结果表明,Fenton氧化可以有效去除土壤中胶质和沥青质,并且使土壤中微生物的生长速率加快。因此,Fenton氧化能够促进后续的微生物修复。

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