SOLUBILIZER DESIGN FOR INTENSIFYING REMEDIATION OF SOIL WITH PETROLEUM HYDROCARBON POLLUTANTS
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摘要: 石油烃是一种典型的石化场地特征污染物,具有较强的人体健康和生态系统毒性。在各类修复技术中,原位生物修复技术扰动小、成本低、安全性好,适合在役场地污染土壤修复,但该类技术存在修复周期长、去除效率低等问题。针对石油烃污染土壤生物修复技术存在的制约问题,制备了4种用于强化石油烃污染物微生物降解的新型增溶剂,其临界胶束浓度均为100~120 mg/kg,表面张力约为30 mN/m。淋洗试验的条件下,LAS-1、LIS-1、LAS-2 3种增溶剂均能将27000 mg/kg的石油烃含量降低至4500 mg/kg以下,污染物溶出效果主要取决于增溶剂与污染土壤的用量比。微生物-增溶试验中,增溶剂强化效果明显,淋洗处理方式与增溶处理效果一致,对提高增溶剂性能评价效率有着良好的借鉴意义。Abstract: Several remediation technologies have been exploited and developed to remove petroleum hydrocarbons, a typical pollutant in the petrochemical industry. Bio-remediation has been considered an appropriate one to treat the in-service sites for its advantages in difficulty, cost, and security. Nevertheless, the application of this technology was still restricted by tedious periods and limited efficiency. Thus, 4 kinds of solubilizers were designed and tested in this paper. To all solubilizers, the critical micelle concentration(CMC) was determined within 100~120 mg/kg and the corresponding surface tension was around 30 mN/m. In a typical soil-flushing process, the total petroleum hydrocarbons(TPHs) could be decreased from 27000 mg/kg to 4500 mg/kg or less by LIS-1, LAS-1, and LIS-2, and the TPH removal was proved to depend mainly on the ratio of solubilizers to the polluted soil. The intensification of the solubilizer was confirmed by the micro-biological degradation process, and the results were proved consistent with that of the soil-flushing process. Further, such consistency could help reduce the design period of more new types of solubilizers and improve the development efficiency of soil solubilization technology.
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