H2O2分次投加对Fenton氧化修复石油污染土壤及后续生物降解的影响
Impact of stepwise addition of H2O2 on Fenton oxidation and subsequent biodegradation of oil-contaminated soil
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摘要: Fenton化学氧化和生物联合修复可以有效提高土壤有机污染物的去除效率.本文考察了H2O2分次投加对Fenton氧化过程中，土壤有机物（SOM）氧化量、石油烃（TPH）去除量、营养物质释放情况以及后续生物修复过程中的营养利用情况和修复效果的影响.结果表明，H2O2分次投加可以有效减少SOM的氧化、提高TPH去除率并能促进后续生物修复.实验发现，当900 mmol·L-1 H2O2分4次投加时，Fenton氧化阶段SOM氧化率最低（1.86%）、TPH去除率最高（32.14%），且土著细菌的残余量也最高（5.0×106 CFU·g-1），这使得该体系营养物质在生物修复阶段得以充分利用，生物去除率高达38%，总TPH去除率达到70%，在4种投加方式下是最高的.H2O2分次投加的Fenton氧化方式是提高TPH去除率并促进后续生物降解的有效方法.Abstract: The removal efficiency of soil organic pollutants could be effectively improved by the combination of Fenton chemical oxidation and bioremediation. In this paper, the effect of stepwise addition of H2O2 on the oxidation of soil organic matter (SOM), the removal of total petroleum hydrocarbons (TPH), the release of nutrients in the Fenton oxidation process, and the nutrient mobilization and the removal efficiency in the subsequent bioremediation were investigated. The results showed that the removal efficiency of TPH increased and promote subsequent bioremediation after the stepwise addition of H2O2, due to the oxidation of SOM be effectively reduced. In addition, when the 900 mmol·L-1 H2O2 was divided 4 times to add, the TPH removal efficiency was the highest (32.14%), and the residual amount of the indigenous bacteria was the highest (5.0×106 CFU·g-1). The reason is that the SOM oxidation efficiency was the lowest (1.86%). These could promote nutrition mobilization in this system. What's more, the biological removal efficiency was up to 38% and the total TPH removal efficiency reached 70%, which was the highest in four ways. It is indicated that the stepwise addition of H2O2 in Fenton oxidation process is an effective way to improve the TPH removal efficiency and promote subsequent biodegradation.
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