nZVI强化活性污泥对偶氮染料脱色及对微生物产物的影响  

Influence of nZVI Dosing for Enhanced Activated Sludge on Decoloration of Azo Dye and Microbial Products

作　　者：秦敏敏[1,2] 方芳[1,2] 李一洲[1,2] 冯骞[1,2] 操家顺[1,2] 

机构地区：[1]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098 [2]河海大学环境学院,江苏南京210098

出　　处：《净水技术》2016年第1期54-60,共7页Water Purification Technology

基　　金：国家自然科学基金(No.51008112;51208112);国家科技重大专项(No.2012ZX07101-003)

摘　　要：为研究纳米零价铁(nano-scale zero-valent iron,nZVI)对活性污泥强化偶氮染料脱色及对活性污泥微生物产物的影响,采用间歇试验考察投加nZVI对厌氧/好氧处理偶氮染料活性艳红K-2BP的活性污泥系统中,污染物去除效果及微生物胞外聚合物(EPS)和溶解性微生物产物(SMP)的影响。结果表明,在投加nZVI的活性污泥系统中(R2),活性艳红K-2BP在12h内的脱色率达到97%,远高于未投加的活性污泥系统(28%)(R1)。nZVI的投加降低了R2厌氧段化学需氧量(COD)的降解速率,而在好氧段COD降解速率几乎不受影响。nZVI腐蚀生成的Fe2+降低了R2中EPS的提取量,同时nZVI投加和K-2BP降解中间产物刺激了SMP的产生,R2中厌氧末和好氧末SMP含量分别是R1的1.2和1.5倍。To investigate the influences of nano-scale zero-valent iron （nZVI） dosing of enhanced activated sludge on decoloration of azo dye and microbial products, batch experiments were carried out to discuss the effects of anaerobic/aerobic activated sludge system for removing azo dye （reactive brilliant red K-2BP） with nZVI dosing on the pollutant removal and the productions of extracellular polymeric substances （EPS） and soluble microbial product （SMP）. The results indicated that the removal efficiency of reactive brilliant red K -2BP reached 97% within 12 hours in the activated sludge system with nZVI dosing （R2） , which was much higher than that in the activated sludge without nZ^I dosing （RI）. The chemical oxygen demand （COD） degradation rate decreased in R2 due to the dosing of nZVI, however, the COD degradation rate in aerobic phase was not influenced. The formation of Fez＋ of by nZVI corrosion reduced extracted EPS contents. In the meanwhile, SMP was stimulated because of the toxicity of nZVI and intermediates of the azo dye, and SMP concentrations in R2 at the end of anaerobic and aerobic phase were 1.2 and l. 5 fold than those in R1, respectively.

关 键 词：纳米零价铁(nZVI) 活性污泥 偶氮染料 胞外聚合物(EPS) 溶解性微生物产物(SMP) 

分 类 号：X703[环境科学与工程—环境工程]