Kulik Niina, Goi Anna, Trapido Marina, Tuhkanen Tuula
Department of Chemical Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia.
J Environ Manage. 2006 Mar;78(4):382-91. doi: 10.1016/j.jenvman.2005.05.005. Epub 2005 Sep 9.
The ability of pre-oxidation to overcome polycyclic aromatic hydrocarbons (PAH) recalcitrance to biodegradation was investigated in creosote contaminated soil. Sand and peat artificially spiked with creosote (quality WEI C) were used as model systems. Ozonation and Fenton-like treatment were proved to be feasible technologies for PAH degradation in soil. The efficiency of ozonation was strongly dependent on the water content of treated soil samples. The removal of PAH by Fenton-like treatment depended on the applied H2O2/soil weight ratio and ferrous ions addition. It was determined that the application of chemical oxidation in sand resulted in a higher PAH removal and required lower oxidant (ozone, hydrogen peroxide) doses. The enhancement of PAH biodegradability by different pre-treatment technologies also depended on the soil matrix. It was ascertained that combined chemical and biological treatment was more efficient in PAH elimination in creosote contaminated soil than either one alone. Thus, the combination of Fenton-like and the subsequent biological treatment resulted in the highest removal of PAH in creosote contaminated sand, and biodegradation with pre-ozonation was found to be the most effective technology for PAH elimination in peat.
研究了预氧化克服杂酚油污染土壤中多环芳烃（PAH）难生物降解性的能力。用人工添加杂酚油（质量等级为WEI C）的沙子和泥炭作为模型系统。臭氧化和类芬顿处理被证明是土壤中PAH降解的可行技术。臭氧化效率强烈依赖于处理后土壤样品的含水量。类芬顿处理对PAH的去除取决于所施加的H2O2/土壤重量比和亚铁离子添加量。已确定在沙子中应用化学氧化导致更高的PAH去除率，并且需要更低的氧化剂（臭氧、过氧化氢）剂量。不同预处理技术对PAH生物降解性的增强也取决于土壤基质。已确定化学和生物联合处理在去除杂酚油污染土壤中的PAH方面比单独的任何一种处理都更有效。因此，类芬顿处理与后续生物处理相结合导致杂酚油污染沙子中PAH的去除率最高，并且发现预臭氧化生物降解是泥炭中PAH去除的最有效技术。
