摘要
为了探究我国北方水体中藻类对Cd^(2+)的富集行为,选取常见的蓝藻(钝顶螺旋藻)和绿藻(小球衣藻),模拟天然藻类对Cd^(2+)的吸附和吸收,研究藻液浓度、时间、pH值、温度、共存阳离子类型对富集过程的影响。结果发现:2种藻对Cd^(2+)的富集性能优于活性炭,富集量高出2~17倍左右。藻对Cd^(2+)的富集率随着藻液浓度的增加而升高,而单位富集量则呈现下降趋势;8 h后富集达到饱和;当pH值在3.0~9.0范围内,富集量随着pH值的升高而增加;在室温25℃时富集量最高,低温或高温时富集量都有明显下降;Fe3+对钝顶螺旋藻富集Cd^(2+)几乎没有影响,但对小球衣藻有拮抗作用,Na+、Ca^(2+)对2种藻类富集Cd^(2+)均表现为拮抗作用,且价态越高,拮抗作用越明显。因此,在适宜的环境中,钝顶螺旋藻和小球衣藻对Cd^(2+)具有良好的富集效果。
Two kinds of common northern surface waters were selected to algal species （Spirulina platensis and absorb Cd^2＋ in order to investigate the Chlamydomonas microsphaera ） in accumulation behavior of cadmium ion （Cd^2＋ ） on aquatic algae. Accordingly, various factors that known to influence Cd^2＋ accumulation on algae, such as algal concentration, exposure time, pH value, temperature, and the type of coexisting cations, were studied. Our results showed that the Cd^2＋ accumulation capacities of the two kinds of algal species to Cd^2＋ were higher than that of active carbon by about 2 to 17 times. With the increase of algal concentrations, we found that bio-enrichment ratios of Cd^2＋ increased, whereas bio-enrichment capacity per unit mass decreased. And we also found that accumulation tended to saturate 8 h later. Bio-enrichment capacity rose when pH increased from 3.0 to 9.0. The accumulation capacity to Cd^2＋ was the greatest at 25 ℃ , and it declined when increasing or decrea- sing the temperature. Ferric iron （Fe^3＋ ） had no effect on accumulation of Cd^2＋ by S. platensis, but it showed antagonistic to accumulation by C. microsphaera. In addition, ionic sodium （Na ^＋ ） and calcium （Ca^2＋ ） were antagonistic for Cd^2＋ accumulation on both algal species, and the antagonism was reinforced with cationic valence increasing. Therefore, both S. platensis and C. microsphaera can present excellent Cd^2＋ accumulation abilities in suitable aquatic environment.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第6期2997-3004,共8页
Chinese Journal of Environmental Engineering
基金
农业部公益性行业科研专项(201203045)
关键词
钝顶螺旋藻
小球衣藻
水体
CD^2+
富集性能
影响因素
富集量
Spirulina platensis
Chlamydomonas microsphaera
water
Cd^2＋
accumulation capability
influencing factor
bio-enrichment capacity
