摘要
以海藻酸钠和活性炭为包埋剂、CaCl_(2)为交联剂,采用吸附-包埋法制备了固定化藻菌球,处理偶氮染料碱性橙Ⅱ.通过响应面法优化了制备条件,采用扫描电镜观察了藻菌球外部和内部的结构,并考察了其重复利用性能.结果表明,藻菌球的最佳制备条件为:海藻酸钠、活性炭、CaCl_(2)质量浓度分别为2.58%、0.838%、2%;固定化生物量为1.139%(质量浓度),泥和藻的质量比为2:1;固定化时间为14h.当进水染料浓度在50~250mg/L,进水pH值在6~10.5范围内,脱色率均可达到90%以上,TOC的去除率在74%~90%之间.由紫外-可见全波长扫描图谱和GC-MS扫描图谱可知,碱性橙Ⅱ中的氮氮双键、共轭体系以及苯环结构均被破坏,发生脱色降解反应,实现了对该偶氮染料的矿化.藻菌球经过5次重复利用,仍可保持较高的脱色率和TOC去除率.
The adsorption-embedding method was used to prepare immobilized algal-bacteria spheres,in which sodium alginate and activated carbon were used as embedding agents,along with CaCl_(2) as the cross-linking agent for treating azo dye basic orange ll.The external and internal structures of these spheres were examined via scanning electron microscopy and their reusability was investigated.Results indicate that the optimal preparation conditions were as follows:sodium alginate,activated carbon and CaCl_(2) concentrations(w/w)of 2.58%,0.838%and 2%,respectively,an immobilized biomass concentration of 1.139%,a sludge-to-algae mass ratio of 2:1 and an immobilization period of 14h.Decolorization efficiency exceeded 90%,while TOC removal rates ranged from 74%to 90%at influent dye concentrations between 50 and 250mg/L and influent pH values between 6and 10.5.UV-visible full-wavelength and GC-MS scanning spectra demonstrated the destruction of the nitrogen-nitrogen double bond,conjugated system and benzene ring structure in basic orange II,which confirmed the decolorization and degradation reactions,thereby the mineralization of the azo dye.After five cycles of reuse,the algal-bacteria spheres maintained a high efficiency of decolorization and TOC removal.
作者
赵联芳
丁奎元
于雪晴
ZHAO Lian-fang;DING Kui-yuan;YU Xue-qing(College of Environment,Hohai University,Nanjing 210098,China;Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Education,Hohai University,Nanjing 210098,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2024年第2期781-792,共12页
China Environmental Science
关键词
藻菌共生系统
固定化
响应面法
碱性橙Ⅱ
降解过程
algal-bacterial symbiotic system
immobilized
response surface methodology
basic orange II
degradation process
