低浓度Ce^(3+)对厌氧颗粒污泥比产甲烷活性和胞外多聚物的影响  

EFFECT OF LOW CONCENTRATIONS OF CERIUM(Ⅲ) ON THE SPECIFIC METHANOGENIC ACTIVITY AND EXTRA CELLAR POLYSACCARIDES OF ANAEROBIC GRANULAR SLUDGE

作　　者：夏青[1] 丁丽丽[2] 任洪强[1] 吴吉春[2] 关梅[3] 

机构地区：[1]南京大学环境学院 [2]南京大学地球科学系 [3]南京大学生命科学学院生物系,南京210093

出　　处：《环境化学》2006年第6期718-721,共4页Environmental Chemistry

基　　金：江苏省科技攻关项目(BE2005011).

摘　　要：在间歇培养条件下,研究了低浓度Ce3+对启动驯化、稳定培养和酸化等不同状态对厌氧颗粒污泥比产甲烷活性的影响.结果表明,低浓度Ce3+可促进厌氧颗粒污泥的比产甲烷活性;0.05mg.l-1Ce3+对稳定培养中的厌氧颗粒污泥比产甲烷活性促进作用最大,提高了14.29%,对酸化污泥促进作用较弱,低于5%,对启动驯化和再启动污泥有所抑制,抑制程度分别为7.67%和1.64%;驯化培养过程有利于污泥对稀土的适应.Ce3+的加入降低了启动驯化、稳定培养、严重酸化和再启动污泥的胞外多糖含量,有利于颗粒污泥的稳定性.Ce3+使驯化、稳定培养和再启动状态污泥的胞外核酸含量降低,而酸化污泥的胞外核酸含量升高,可用细胞膜通透性的改变解释.Batch experiments were conducted to study the effect of low concentration of Ce^3＋ on the activity of anaerobic granular sludge in the state of start-up, stabilization, acidification and restart-up by determining its specific methanogenic activity （SMA）, extra cellar polysaccharides and nucleic acids content. Results showed that low concentration of Ce^3＋ could stimulate the SMA of anaerobic granular sludge. The effects of 0. 05mg ·l^-1 Ce^3 ＋ on sludge in different states were different： the maximum increase of 14. 29% was found in the stabilization state; the stimulation to acidified sludge was weaker, which was under 5% ; in the start-up and restart-up, the SMA was inhibited by 7. 67% and 1.64% respectively. Acclimation and incubation of sludge favored its accommodation to the rare earth elements. Ce^3＋ decreased the extra cellar polysaccharides content of sludge in the state of start-up, stabilization, severe acidification and restart-up, which was benefit for stability of granular sludge. Ce^3＋ decreased the extra cellar nucleic acids content of sludge in the state of start-up, stabilization and restartup, but increased that of acidified sludge; this could be explained by the alteration of membrane permeability.

关 键 词：CE^3+ 厌氧颗粒污泥 产甲烷活性 胞外多聚物 

分 类 号：X132[环境科学与工程—环境科学]