镧、铈对厌氧颗粒污泥产甲烷的Hormesis效应及其动力学研究  

Hormesis of lanthanum and cerium on methanogenesis of anaerobic granular sludge and its kinetics

作　　者：夏青[1] 任洪强[1] 丁丽丽[2] 洪宇宁[1] 吴吉春[2] 

机构地区：[1]南京大学环境学院,污染控制与资源化研究国家重点实验室,南京210093 [2]南京大学地球科学系,南京210093

出　　处：《环境科学学报》2007年第8期1233-1237,共5页Acta Scientiae Circumstantiae

基　　金：江苏省社会发展项目(No.BS2005050)~~

摘　　要：间歇培养条件下研究了单一稀土元素镧（La^3＋）和铈（Ce^3＋）在不同浓度水平下对厌氧颗粒污泥活性及其动力学行为的影响.结果表明,La^3＋和Ce^3＋对厌氧颗粒污泥比产甲烷活性有促进作用的浓度范围均为0.01～0.1 mg·L^-1,促进作用浓度峰值均为0.05mg·L^-1,最大促进百分比分别为10.35%和20.79%;La^3＋和Ce^3＋对SMA（比甲烷活性）的半抑制浓度分别为5mg·L^-1和1000mg·L^-1,La^3＋较易对污泥产生抑制作用.米-门方程可以用来描述厌氧消化过程中甲烷发酵阶段的动力学行为,稀土元素La^3＋和Ce^3＋投加至反应系统后,提高了甲烷发酵过程的动力学常数Vmax和半饱和常数Ks.Batch experiments were conducted to investigate the effects of the rare earth ions La^3 ＋ and Ce^3 ＋ on the activity of anaerobic granular sludge and the kinetics of anaerobic digestion. The results showed that both of the ions can promote the Specific Methanogenic Activity （SMA） at concentrations from 0.01 to 0.1 mg·L^-1a^3 ＋ and 20.79% for Ce^3 ＋ . The EC50 concentrations were 5 mg·L^-1 for La3 ＋ and 1000 mg·L^-1 for Ce^3 ＋ , so La^3 ＋ is a stronger suppressant. The Michaelis - Menten model could be used to describe the kinetic behavior of the methane fermentation phase in anaerobic digestion. Addition of La^3 ＋and Ce^3 ＋increased the kinetic constants Vmax and Ks.

关 键 词：镧 铈 稀土元素 厌氧颗粒污泥 产甲烷活性 动力学 

分 类 号：X703[环境科学与工程—环境工程]