纳米Fe~0协同微生物对PCB77的降解研究

研究了纳米零价铁协同微生物降解水溶液中的PCB77。从污染土样中分离出一株多氯联苯（PCBs）降解菌,对其进行革兰氏染色形态观察,并用降解菌降解PCB77。结果表明：培养温度30℃、溶液pH 7.0、微生物接种量109 cfu·mL-1、PCB77初始质量浓度1.0 mg·L-1时,降解菌对PCB77的降解率为58.63%。纳米零价铁对PCB77的降解是一个还原脱氯过程,7 d时的降解率为82.99%。采用纳米零价铁/微生物联合体系降解水溶液中PCB77,降解率显著高于微生物和纳米零价铁单一体系,降解率可达93.30%。研究结果将为环境中PCBs残留提供了一种高效去除的方法,并为PCBs污染土壤的修复提供理论依据。

Degradation of PCB77 by nanoscale zero-valent iron and microorganism integrated treatment system

The degradation of PCB77 in solution with a combination of nanoscale zero-valent iron and micro-organism were studied.A bacterium strain was isolated from soil contaminated by polychlorinated biphenyls（PCBs）,which was enriched and used to de-grade PCB77.When the incubation temperature was 30 ℃,solution pH was 7.0,the inoculation amount of microorganism was 109 cfu.mL-1 and the concentration of PCB77 was 1.0 mg·L-1,the degradation rate of PCB77 was 58.63 % on the seventh day.Meanwhile,PCB77 could be reductive dechlorined by nanoscale zero-valent iron,and the degradation rate of PCB77 could reach to 82.99%.Furthermore,the combination of nanoscale zero-valent iron and microorganism could accelerate the degradation of PCB77 compared to the individual,the degradation rate of PCB77 by the integrated system could reach to 93.30%.The studies will provide an effec-tive method for the degradation of PCBs and theoretical basis for the remediation of contaminated soil by PCBs.