Remediation Of Typical Organic Pollution Sites Contaminated By Relocated Enterprise

With the development of modern advance and the accelerated process of urbanization, there has been a series of entironment problems emerging. Among of these, soil contamination arisen from relocated enterprise becomes especially prominent. The remediation technique of contaminated sites depends on the characteristics of contaminated site and the types of landfill reclamation. In order to reach the remediation objectives of contamination sites with high concentration and recalcitrant pollutant and land landfill using for commercial, chemical and physical technique commonly used in the soil remediation. Therefore, this research focused on the degradation characteristic of chloroorganics pollution in the ultrasonic/zero-valent iron system basing contamination sites with heavy pollution and commercial using. In order to achieve the remediation purpose of contamination sites with low concentration pollutant and land landfill using for noncommercial, ecological restoration technique commonly used in the soil remediation. Accordingly, in this paper I studied the phytoremediation process in soil contaminated with phenanthrene and nitrobenzene. The main research content and conclusions are summarized as follows:1) The influencing factors of degradation of chloroorganics pollution in the ultrasonic/zero-valent iron system were researched. The result showed that the system of ultrasonic/zero-valent iron had good removal effect. The amount of zero-valent iron is the dominating factor influencing chlordane and mirex degradation. The reduction speed of chlordane and mirex increased and then decreased along with the amount of zero-valent iron. The reduction speed of chlordane and mirex increased along with the time and power and the reduction speed reached a plateau. In addition, The influence of the ratio of sludge is not distinct. The best combination of factors for the degradation of chlordane was A2B2C3D2and for mirex was A2B3C4D2. The result of acute toxicity test showed that the ultrasonic/zero-valent iron system is a safe and efficient system for the degradation of chloroorganics pollution. In the pilot test, after90min chlorobenzen was degraded completely in the ultrasonic/zero-valent iron system.2) The effect of willow, horseradish, organic fertilizer and irrigation on the degradation and transference of phenanthrene and nitrobenzene in plant soil field system were investigated. In the presence of willow, horseradish, organic fertilizer, the concentration of phenanthrene and nitrobenzene in soils decreased more effectively. During the330day’s planting, phenanthrene concentration in leaves and stems of willow increased and then decreased; nitrobenzene concentration in leaves and stems of willow increased steadily. In the presence of willow organic fertilizer, phenanthrene and nitrobenzene concentration in root of willow is the highest in the all treatment group. In addition, the root concentration factors (RCFs) for phenanthrene higher than the RCFs of leaves and stems, just the opposite for nitrobenzene. In a word, three is promising future for phytoremediation with willow horseradish and organic fertilizer. The phytoremediation is environment-friendly and high efficiency technique.