沉积物中有机质及金属水合氧化物对γ-666、p,p′-DDT缺氧生物降解性影响  

The Effects of Organic Matter and Hydrous Metal Oxides on the Anaerobic Degradation of γ-666, p,p′-DDT in Liaohe River Sediments

作　　者：赵旭[1] 全燮[1] 赵慧敏[1] 陈硕[1] 陈景文[1] 赵雅芝[1] 

机构地区：[1]大连理工大学环境科学与工程学院,大连116012

出　　处：《环境科学》2002年第3期115-118,共4页Environmental Science

基　　金：国家自然科学基金资助项目 (2 97770 0 2 ) ;教育部重点基金资助项目 (0 0 0 2 8)

摘　　要：通过逐级去除辽河流域沉积物中有机质 ,水合铁、铝、锰氧化物 ,考察了沉积物中有机质和金属水合氧化物对γ 666、p ,p′ DDT的缺氧生物降解的影响 .结果表明 ,γ 666、p ,p′ DDT的缺氧生物降解均符合准一级动力学方程 .在无外加碳源的原沉积物中准一级动力学常数分别为 0 0 2 0d- 1、0 0 0 9d- 1.外加碳源后 ,γ 666、p ,p′ DDT在原沉积物中的准一级动力学常数分别为 0 0 71d- 1、0 0 5 4d- 1;在去除有机质的沉积物中为 0 0 47d- 1、0 0 3 7d- 1;在同时去除有机质和金属水合氧化物的沉积物中为 0 0 67d- 1、0 0 5 9d- 1.表明沉积物中的有机质促进了γ 666、p ,p′ DDT的缺氧生物降解性 .而金属水合氧化物对γ 666、p ,p′Effects of organic matter and active Fe, Al, Mn oxides on the anaerobic degradation of γ 666, p,p′ DDT were investigated by means of removing organic matter and hydrous metal oxides in Liaohe River sediments sequentially. The results showed that the anaerobic degradation of γ 666, p,p′ DDT followed pseudo first order kinetics in different sediments; but, the extents and rates of degradation were different, even the other conditions remained same. Anaerobic degradation rates of γ 666, p,p′ DDT were 0 020 d -1 , 0 009 d -1 respectively for the sediments without additional carbon resources. However, with additional carbon resources, the anaerobic degradation rates of γ 666, p,p′ DDT were 0 071d -1 and 0 054d -1 in the original sediments respectively. After removing organic matter, the rates were decreased to 0 047d -1 , 0 037 d -1 . In the sediments removed organic matter and hydrous metal oxides, the rates were increased to 0 067d -1 , 0 059 d -1 . This results indicated that organic matter in the sediments accelerated the anaerobic degradation of γ 666 , p,p′ DDT; the hydrous metal oxides inhibited the anaerobic degradation of γ 666 and p,p′ DDT.

关 键 词：缺氧降解 有机质 金属水合氧化物 γ-666、p p′-DDT 

分 类 号：X131.3[环境科学与工程—环境科学]