固定化毛霉对工业和农田污染土壤中多环芳烃的降解和生物有效性评价

Degradation of polycyclic aromatic hydrocarbons in industrial and agricultural soils by immobilized Mucor sp. and their bioavailability assessment

为了探讨微生物修复不同类型多环芳烃污染土壤的可行性,应用固定化毛霉对多环芳烃污染工业土壤及农田土壤进行微生物修复,用羟丙基-β-环糊精(HPCD)提取模拟评价多环芳烃的微生物可利用性,并分析多环芳烃微生物降解和生物可利用性的相关关系.焦化厂污染土壤中多环芳烃的30 d降解率为77.6%,沈抚灌区污染土壤中多环芳烃的30 d降解率为54.2%,焦化厂土壤和污灌区农田土壤中多环芳烃降解差异明显.焦化厂土壤和污灌区土壤中多环芳烃的30 d降解量和多环芳烃的环糊精可提取量具有相关性,各环数多环芳烃的环糊精可提取量变化解释了焦化厂和污灌区土壤中多环芳烃降解的差异机制,说明可用环糊精提取量预测微生物降解土壤多环芳烃的情况.

In order to test the feasibility of microbial remediation of soils contaminated with polycyclic aromatic hydrocarbons（PAHs）,immobilized Mucor sp.was employed to remediate PAH contaminated industrial and agricultural soils,and hydroxypropyl-β-cyclodextrin（HPCD） was used to assess microbial availability of PAHs.Relationships between PAH degradation in 30 days and HPCD extractable amounts of PAHs in coking plant soil（CPS） and waste water irrigation area soil（WIAS） were also analyzed.In 30 days,77.6% of total PAH was degraded in CPS,and 54.2% of total PAH was degraded in WIAS.PAH degradation in CPS and WIAS was rather different.Good correlations were observed between PAH degradation in 30 days and HPCD extractable amounts of PAHs in both CPS and WIAS.Mechanism for the difference between individual rings of PAH degradation in CPS and WIAS is explained by the HPCD extractable amounts of individual rings of PAHs,demonstrating that PAH degradation in these soils can be predicted by using HPCD extractable amounts of PAHs.