石油烃污染土壤生物修复的强化增溶剂研究

SOLUBILIZER DESIGN FOR INTENSIFYING REMEDIATION OF SOIL WITH PETROLEUM HYDROCARBON POLLUTANTS

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。

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.