Removal of tributyltin (TBT) from wastewater by microalgae

被引:0
|
作者
Tam, NFY [1 ]
Chong, A [1 ]
Wong, YS [1 ]
机构
[1] City Univ Hong Kong, Dept Biol & Chem, Hong Kong, Hong Kong, Peoples R China
来源
WATER POLLUTION VII: MODELLING, MEASURING AND PREDICTION | 2003年 / 9卷
关键词
D O I
暂无
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The biosorption and biodegradation of tributyltin (TBT) by free cells of a resistant microalgal species, Chlorella sorokiniana at two different densities, 1x10(6) cells ml(-1) (low) and 1x10(7) (high) were investigated. TBT in contaminated water was continuously removed by microalgal cells and reached a 54% and 74% removal at the end of 14 days treatment in low and high density cultures, respectively. The pattern of TBT removal in both densities was similar: with the decreases of TBT in water, TBT uptake by algal cells increased, reached a peak and declined to low levels towards the end of the treatment period. In the high density culture, total amounts of TBT uptake, including the adsorption on cell surface and absorption inside the cells, increased from 109 to 159mug TBT+ from days 1 to 7, then declined to 95mug TBT+ at day 14. The proportions of TBT adsorbed on the cell surface decreased while that in the intracellular fraction increased with time, suggesting that the adsorbed TBT moved gradually into the cells for stepwise debutylation. The two degradation products, DBT (dibutyltin) and MBT (monbutyltin), started to appear in the intracellular fraction from day 3 and day 7onwards in high and low density cultures, respectively, with more MBT than that of DBT. These results indicate that C sorokiniana was not only capable of removing TBT from contaminated water, TBT was absorbed and degraded into DBT which was then rapidly metabolized to MBT by intracellular enzymes.
引用
收藏
页码:261 / 271
页数:11
相关论文
empty
未找到相关数据