微生物修复多环芳烃污染土壤对果实类蔬菜的影响研究

立足于蔬菜基地大棚,利用微生物对PAHs污染土壤进行修复治理,将PAHs专性降解菌(N)作用于4种果实类蔬菜(黄瓜、茄子、辣椒和番茄),并采用鼠李糖脂(RL)作为强化剂。结果表明,在C K组中,种植番茄土壤中降解量最佳达32.31μg/kg;在RL组中,种植黄瓜土壤中降解量最佳达56.64吨/kg;在N组中,种植黄瓜土壤中降解量最佳达96.45μg/kg;在RL+N组中,种植黄瓜土壤中降解量最佳达195.23吨/kg。蔬菜中的PAHs含量在20.13~45.47μg/kg之间,且在RL+N实验组的黄瓜中检测得到最小值20.13μg/kg。本着“边生产边修复”以及食品安全原则,选定“RL+N组合强化黄瓜修复PAHs污染土壤方式”为修复PAHs污染土壤的最优方案。

This study is based on the vegetable base greenhouse,using microbes to repair PAHs contaminated soil,that applying the PAHs obligate degrading bacteria(N)on four kinds of fruit vegetables(cucumber,eggplant,pepper and tomato),and using rhamnolipid(RL)acts as a strengthening agent.The results showed that in the CK group,the best degradation of tomato soil was 32.31μg/kg.In the RL group,the best degradation amount of cucumber soil was 56.64μg/kg.In the N group,the best degradation amount was 96.45μg/kg in the cucumber soil.In the RL+N group,the optimum amount of degradation in cucumber planted soil is 195.23μg/kg.The content of PAHs in vegetables was between 20.13〜45.47μg/kg,and the minimum value was 20.13μg/kg in the cucumber of the RL+N experimental group.Based on the principle of“Repairing while Producing”and food safety,the“RL+N combination strengthening cucumber planted to repair PAHs contaminated soil”was selected as the optimal solution for remediation of PAHs contaminated soil.