铜绿微囊藻对DBP和DEHP的富集和降解特性  

Characteristics of Accumulation and Biodegradation of DBP and DEHP in Microcystis Aeruginosa

作　　者：迟杰[1] 董林林[1] 李金娟[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072

出　　处：《天津大学学报》2006年第12期1395-1398,共4页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(20277026)

摘　　要：选择富营养化优势藻———铜绿微囊藻,研究该藻对邻苯二甲酸二丁酯(DBP)和邻苯二甲酸二异辛酯(DE-HP)这两个最常用的邻苯二甲酸酯类化合物(PAEs)的富集和降解动力学过程.实验在250 mL三角瓶中进行,光照度(4 000±100)lx,DBP和DEHP初始浓度均约为0.4 mg/L.研究结果表明,铜绿微囊藻对DBP和DEHP均有较显著的降解作用,降解过程符合一级动力学方程,降解速率常数分别为5.9×10-3和2.0×10-3h-1.铜绿微囊藻中DBP和DEHP浓度均在实验1 h时达最大值,分别为5.85和8.61 mg/g(dw).藻对DBP和DEHP的生物富集因子(BCF)值分别在实验1 h时和12 h时达最大,分别为1.64×104和2.86×104.藻分泌物在DBP和DEHP的富集过程中起着重要的作用.细胞分泌物增加,导致DBP和DEHP的生物可利用性降低,使藻中DBP和DEHP浓度及其BCFs降低.Kinetics experiments of the biodegradation and accumulation of dibutyl phthalate （DBP） and di（2- ethylhexyl） phthalate （DEHP）, two of the most important phthalate esters, were conducted in Microcystis aeruginosa. The experiments were performed in 250 mL flasks at （25 ± 1 ） ℃ with a light intensity of （4 000 ± 100） lx continuously. The initial concentration of DBP and DEHP was both about 0. 4 mg/L. Experimental resuits showed that Microcystis aeruginosa was able to accumulate and degrade DBP and DEHP significantly. The decrease of DBP and DEHP in the algal solution was well fitted with a first-order kinetic equation. The first-order biodegradation constant of DBP and DEHP by the alga was 5.9 × 10^ -3 and 2.0 × 10 ^-3 h ^-1, respectively. The amounts of DBP and DEHP accumulated by the alga both reached the maximum of 5. 85 and 8.61 mg/g（dw） at 1 h, respectively. Bioconcentration factor （BCF） reached maximum of 1.64×10^4 at 1 h for DBP and 2.86 ×10^4 at 12 h for DEHP, respectively. BCFs of DBP and DEHP decreased with increasing algal exudate as measured by dissolved organic carbon （DOC） and a strong correlation between BCFs and DOC was obtained. The results indicated that DOC played an important role in the bioconcentration of DBP and DEHP.

关 键 词：铜绿微囊藻 邻苯二甲酸二异辛酯 邻苯二甲酸二丁酯 富集 生物降解 

分 类 号：X171[环境科学与工程—环境科学]