摘要
希瓦氏菌MR-1可有效降解常用偶氮染料甲基橙(MO)等,但采用该方法实现高效深度的降解则需要较长的时间。利用海藻酸钠(SA)包埋希瓦氏菌MR-1和纳米四氧化三铁(Fe_(3)O_(4))对MO脱色处理,探讨了包埋微球SA、SA/Fe_(3)O_(4)、SA/希瓦氏菌MR-1以及SA/希瓦氏菌MR-1/Fe_(3)O_(4)的形态学、流变性以及机械强度等各方面性质,研究发现添加纳米Fe_(3)O_(4)不仅提高了海藻酸钠包埋希瓦氏菌MR-1对MO的脱色效率,而且提高了微球的机械强度,有利于SA/希瓦氏菌MR-1/Fe_(3)O_(4)微球的重复利用。同时研究和比较了包埋微球SA、SA/Fe_(3)O_(4)、SA/希瓦氏菌MR-1以及SA/希瓦氏菌MR-1/Fe_(3)O_(4)对MO脱色过程中MO的降解效率,并分析了4个循环利用过程中MO的脱色效率,结果表明所有循环过程中包埋微球SA/希瓦氏菌MR-1/Fe_(3)O_(4)对MO的脱色效率更高,而包埋微球SA、SA/Fe_(3)O_(4)对MO的脱色均是由于吸附作用造成的。第4个循环过程中,SA/希瓦氏菌MR-1/Fe_(3)O_(4)微球在1.75 h的脱色效率为77.83%,而SA/希瓦氏菌MR-1微球的脱色效率为53.19%。与SA/希瓦氏菌MR-1微球相比,添加了纳米Fe_(3)O_(4)的微球对MO的脱色效率更高,证实了纳米Fe_(3)O_(4)的添加提高了电子传递效率。
Shewanella oneidensis MR-1 has been proved to be a potential bacterium to decolorize methyl orange(MO).Nevertheless,longer reaction time was needed to achieve higher decolorization efficiency.Thus,it′s necessary to further improve the decolorization efficiency of azo dyes using S.oneidensis MR-1.The embedding of S.oneidensis MR-1 and nano-Fe_(3)O_(4)with sodium alginate(SA)is an ideal mode for efficient decolorization of MO.Morphology,rheology and mechanical strength were studied to better understand the decolorization capacity and recycle of the beads.The MO decolorization efficiency with SA,SA/Fe_(3)O_(4),SA/S.oneidensis MR-1 and SA/S.oneidensis MR-1/Fe_(3)O_(4)beads was studied.Compared with the beads of SA/S.oneidensis MR-1,the decolorization efficiency with SA/S.oneidensis MR-1/Fe_(3)O_(4)was improved.After three cycles,77.83%of decolorization capability could be recovered with beads of SA/S.oneidensis MR-1/Fe_(3)O_(4)while only 53.19%recovered with SA/S.oneidensis MR-1 at 1.75 h in cycle 4 under transverse condition,respectively.The addition of Fe_(3)O_(4)not only improved the decolorization capacity of beads of SA/S.oneidensis MR-1/Fe_(3)O_(4)but also increased the mechanical strength.This research would provide the feasibility for recycling of immobilized microbial with higher efficiency and longer lifetime during wastewater treatment.
作者
黄弘杨
黄津津
王国祥
吴向阳
沈楠
孙丽
HUANG Hong-yang;HUANG Jin-jin;WANG Guo-xiang;WU Xiang-yang;SHEN Nan;SUN Li(School of the Environmental and Safety Engineering,Jiangsu University,Zhenjiang 212013,China;School of Environment/Jiangsu Engineering Laboratory of Water and Soil Eco-Remediation,Nanjing Normal University,Nanjing 210023,China;Water Resources Bureau of Binhu District,Wuxi 214071,China)
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2021年第2期217-223,共7页
Journal of Ecology and Rural Environment
基金
国家水体污染控制与治理科技重大专项(2017ZX07203003)。
