环境工程学报2017，Vol.11Issue(6)：3907-3913,7.DOI:10.12030/j.cjee.201603145
海藻酸钠与纳米Fe3O4联合固定化菌对三氟羧草醚的降解
Biodegradation of acifluorfen using joint immobilized cells of sodium alginate and Fe3O4 nanoparticles
摘要
Abstract
A novel joint immobilization method was developed using sodium-alginate-supported Fe3 O4 nanoparticles (Fe3O4/SA) to immobilize the acifluorfen-degrading strain Pseudomonas citronellolis DK-3,and the optimal dosage of Fe3O4 nanoparticles,degradation characteristics of acifluorfen by Fe3O4/SA joint immobilized cells,and the degradation stability of Fe3 O4/SA joint immobilized cells were investigated in a sequencing batch reactor (SBR).The results of the experiments showed that when the dosage of Fe3O4 nanoparticles was 90 mg · L-1,the initial concentration of acifluorfen was 100 mg · L-1 and degradation rate of acifluorfen was 97.9％.The results from a scanning electron microscope indicated that Fe3O4/SA joint immobilized beads were more suitable for the growth and colonization of acifluorfen-degrading bacteria.The most appropriate pH and temperature for degrading acifluorfen by joint immobilized bacteria was 7-8 and 30 ℃,respectively.Moreover,Fe3 O4/SA joint immobilized cells displayed a better ability to adapt to a wide range of temperatures,pH,NaCl,anti-toxic heavy metal ion levels,and to be used repeatedly.Finally,in a laboratory-scale SBR experiment,Fe3O4/SA joint immobilized cells could maintain stable operation for 35 d and had a degradation rate over 95％.The investigation provides a foundation for the engineering applications of Fe3O4/SA in acifluorfen wastewater treatment.关键词
三氟羧草醚/纳米Fe3O4/固定化/香茅醇假单胞菌/SBRKey words
acifluorfen/nano Fe3O4/immobilization/Pseudomonas citronellolis/SBR分类
资源环境引用本文复制引用
陈道康,蔡天明,陈立伟,丁大虎,杨倩..海藻酸钠与纳米Fe3O4联合固定化菌对三氟羧草醚的降解[J].环境工程学报,2017,11(6):3907-3913,7.基金项目
江苏太湖水环境综合治理科研项目(TH2014210) （TH2014210）
