中文摘要：

以红壤、黄褐土和砂姜黑土为供试土壤,以3,3′,4,4′-四氯联苯（PCB77）为目标化合物,进行了纳米Fe0、微生物以及联合体系降解土壤中PCB77的动力学研究。结果表明,土壤中PCB77自然降解率低,投加纳米Fe0和微生物均能显著加快土壤中PCB77降解速率,降解过程可用一级反应动力学方程拟合。当PCB77初始浓度为4mg·kg-1,纳米Fe0投加量为20mg·g-1,PCB77在红壤、黄褐土和砂姜黑土中反应速率常数k分别为0.0205d-1、0.0165d-1和0.0145d-1;通过富集培养的方法从污染土壤中分离出一株多氯联苯降解菌,初步鉴定该菌株为Pseudomonas sp.,当降解菌投加量为2×108cfu·g-1时,PCB77在3种土壤中反应速率常数分别为0.0136d-1、0.0094d-1和0.0124d-1;当同时投加20mg·g-1纳米Fe0和2×108cfu·g-1降解菌时,其反应速率常数分别为0.0264d-1、0.0218d-1和0.0232d-1。纳米Fe0与微生物协同降解的效果要明显优于纳米Fe0和微生物的单一体系。

英文摘要：

The degradation of 3,3′,4,4′-tetrachlorobiphenyl（PCB77） in soils by nano Fe0 and microorganism was studied. The natural degradation rate of PCB77 was very low in soils, and the degradation of PCB77 could be improved by nano Fe0, microorganism and the nano Fe0 and microorganism integrated treatment system, which followed the pseudo first-order reaction kinetics. When the initial concentration of PCB77 in soil was 4 mg·kg-1, and the dosage of nano Fe0 was 20 mg·g-1, the reaction rate constants（k） were 0.020 5 d-1, 0.016 5 d-1 and 0.014 5 d-1 in red soil, yellow cinnamon soil and shajiang black soil, respectively. When the microbial inoculation amount was 2×108 cfu·g-1, the reaction rate constants（k） were 0.013 6 d-1, 0.009 4 d-1 and 0.012 4 d-1. In the nano Fe0 and microorganism integrated treatment system, the reaction rate constants（k） were 0.026 4 d-1, 0.021 8 d-1 and 0.023 2 d-1. As a result, a combination of nano Fe0 and microorganism could accelerate the degradation of PCB77 compared to the individual use. It suggested that there were significant synergistic effects between nano Fe0 and microorganism for the degradation of PCB77.