Sequential removal of heavy metals ions and organic pollutants using an algal-bacterial consortium.
Sequential removal of heavy metals ions and organic pollutants using an algal-bacterial consortium.
复制标题
DOI：
10.1016/j.chemosphere.2005.09.062
复制
发表时间：
2006-05
期刊：
影响因子：
8.8
通讯作者：
R. Muñoz;M. T. Alvarez;Adriana Muñoz;E. Terrazas;B. Guieysse;B. Mattiasson
中科院分区：
文献类型：
--
作者：
R. Muñoz;M. T. Alvarez;Adriana Muñoz;E. Terrazas;B. Guieysse;B. Mattiasson
残留的藻类细菌生物量的光合支持，有机污染物的生物降解过程中，在封闭的光生物反应器，进行了测试，其积累铜（II），镍（II），镉（II），和锌（II）的能力。选择水杨酸盐作为模型污染物。藻-菌生物质结合了微藻的高吸附能力和剩余生物质的低成本，这使其成为环境应用中有吸引力的生物吸附剂。Cu（II）优先采取了从介质中的金属时，分别存在和组合。有没有观察到的竞争吸附位点，这表明，铜（II），镍（II），镉（II），锌（II）结合到不同的网站和活性镍（II），镉（II）和锌（II）的结合基团存在于非常低的浓度。因此，特别关注Cu（II）的生物吸附。铜（II）的藻-细菌生物质的生物吸附的特征在于由一个缓慢的代谢驱动的摄取的初始快速细胞表面吸附。pH值，Cu（II），和藻菌浓度显着影响铜（II）的生物吸附能力。在初始Cu（II）浓度为20mgl-1、pH为5时，藻菌对Cu（II）的最大吸附容量为8.5 ± 0.4mgg-1。这些与在类似条件下报道的其他微生物吸附剂的值一致。用0.0125M HCl溶液洗脱，从饱和的生物质中解吸Cu（II）是可行的。同时铜（II）和水杨酸盐的去除在连续搅拌槽光生物反应器是不可行的，由于高毒性的铜（II）对微生物培养。引入的吸附柱，挤满了藻类-细菌生物质，之前的光生物反应器降低Cu（II）的浓度，从而允许随后的水杨酸盐的生物降解的光生物反应器。
The residual algal-bacterial biomass from photosynthetically supported, organic pollutant biodegradation processes, in enclosed photobioreactors, was tested for its ability to accumulate Cu(II), Ni(II), Cd(II), and Zn(II). Salicylate was chosen as a model contaminant. The algal-bacterial biomass combined the high adsorption capacity of microalgae with the low cost of the residual biomass, which makes it an attractive biosorbent for environmental applications. Cu(II) was preferentially taken-up from the medium when the metals were present both separately and in combination. There was no observed competition for adsorption sites, which suggested that Cu(II), Ni(II), Cd(II), and Zn(II) bind to different sites and that active Ni(II), Cd(II) and Zn(II) binding groups were present at very low concentrations. Therefore, special focus was given to Cu(II) biosorption. Cu(II) biosorption by the algal-bacterial biomass was characterized by an initial fast cell surface adsorption followed by a slower metabolically driven uptake. pH, Cu(II), and algal-bacterial concentration significantly affected the biosorption capacity for Cu(II). Maximum Cu(II) adsorption capacities of 8.5±0.4mgg−1were achieved at an initial Cu(II) concentration of 20mgl−1and at pH 5 for the tested algal-bacterial biomass. These are consistent with values reported for other microbial sorbents under similar conditions. The desorption of Cu(II) from saturated biomass was feasible by elution with a 0.0125M HCl solution. Simultaneous Cu(II) and salicylate removal in a continuous stirred tank photobioreactor was not feasible due to the high toxicity of Cu(II) towards the microbial culture. The introduction of an adsorption column, packed with the algal-bacterial biomass, prior to the photobioreactor reduced Cu(II) concentration, thereby allowing the subsequent salicylate biodegradation in the photobioreactor.