硫酸盐对老化土壤中多环芳烃厌氧降解的影响  

Effect of Sulfate on Anaerobic Degradation of PAHs in Aged Soil

作　　者：赵倩云 苟雅玲 杨苏才 曹正琼 宋云 李培中 麻俊胜 ZHAO Qianyun;GOU Yaling;YANG Sucai;CAO Zhengqiong;SONG Yun;LI Peizhong;MA Junsheng(Beijing Key Laboratory of Remediation of Industrial Pollution Sites,Environment Protection Research Institute of Light Industry,Beijing 100089,China;Xiangyang Thirty-sixth Middle School,Xiangyang 441000,China)

机构地区：[1]轻工业环境保护研究所,工业场地污染与修复北京重点实验室,北京100089 [2]襄阳市第三十六中学,湖北襄阳441000

出　　处：《环境科学与技术》2018年第12期200-205,共6页Environmental Science & Technology

基　　金：国家自然科学基金项目(41201516).

摘　　要：该研究以多环芳烃(PAHs)污染场地老化土壤为研究对象,通过向土壤中添加电子受体(硫酸盐),开展土壤中PAHs厌氧微生物降解规律研究。研究发现添加硫酸盐电子受体的处理(STS400和STS2000)土壤中2～4环PAHs均发生明显降解,且加入的硫酸盐量越多,PAHs的降解率越高。土壤中2～3环PAHs的降解速率在最初90 d内较高,随着时间推移逐渐放缓,4环PAHs降解较2～3环PAHs相对滞后,5～6环PAHs降解速率最慢。实时定量PCR结果表明,对照处理中微生物数量没有明显变化,添加低浓度硫酸盐处理微生物数量略有增加(0.067个数量级),添加高浓度硫酸盐的处理微生物数量有明显增加(0.724个数量级)。此外发现随着PAHs的分子量和Koc的增加PAHs的降解率降低,但随着PAHs的水溶性增加,其降解效率升高。研究结果为PAHs污染土壤的修复提供了一种选择。The present study focuses on PAHs contaminated aged soils,the anaerobic biodegradation characterizations of PAHs through adding electron acceptors (sulfates)to the soil was investigated.The addition of sulfates could significantly improve anoxic biodegradation of 2-4 rings PAHs,and the more sulfates added,the higher percentage of 2-4 rings PAHs biodegraded.The degradation rates of 2-and 3-rings PAHs is higher in the first 90 days,and it obviously slowed down after 90 days incubation in all treatments.Degradation rates of 4-rings PAHs lags behind 2-and 3-rings PAHs,and degradation rates of 5-and 6-rings is the slowest.Real-time quantification results of PCR show that the bacteria amount in the controls doesn't change obviously,and which slightly increases (0.067 order of magnitude)in the soils with low concentration electron acceptors and relatively significantly increases (0.724 order of magnitude)in the soils with high concentration electron acceptors. The results also showed that the recalcitrance of PAHs increases with increasing molecular weight and organic carbon/water partition coefficient (Koc)of PAHs,but with decreasing solubility of PAHs.The results provide a choice for the remediation of PAHs contaminated soil.

关 键 词：多环芳烃 厌氧降解 硫酸盐 土著微生物 

分 类 号：X53[环境科学与工程—环境工程]