School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China.
Chemosphere. 2019 Feb;217:825-832. doi: 10.1016/j.chemosphere.2018.11.075. Epub 2018 Nov 13.
In our previous studies, Chlorella vulgaris had proven highly efficient in removing selenium (Se) from water, while the disposal of Se containing in algal biomass was still an issue of concern. Firstly, this research suggests algal Se could be released back to water, posing risks to aquatic wildlife. Thus, we further explored the possibility of using C. vulgaris to remove Se and produce lipid and hydrogen simultaneously. Our results show the higher percentage of saturated fatty acids, especially palmitic acid, was found in the sulfur (S) deprived algae exposed to either selenate or selenite, although the highest lipid content (21.9%) was found in the selenite treated algae in full BG11 medium. In addition, compared with the Se free algae, hydrogen production rate was 2.1- and 4.3-fold higher for the selenate and selenite treated algae, respectively. Se removal efficiency achieved by the selenite treated algae through accumulation and volatilization was 2.3-fold higher than the selenate treatment under hypoxic condition with S deprived, which is in contrast to the results obtained under aerobic conditions.
在我们之前的研究中，已证实小球藻从水中去除硒的效率非常高，而含硒藻类生物质的处理仍然是一个令人关注的问题。首先，研究表明藻类中的硒可能会被释放回水中，从而对水生野生动物构成威胁。因此，我们进一步探索了利用小球藻同时去除硒并生产脂质和氢气的可能性。研究结果表明，在缺硫条件下，无论是亚硒酸盐还是硒酸盐处理的藻类，其饱和脂肪酸（尤其是棕榈酸）的比例都较高，尽管在完全 BG11 培养基中用亚硒酸盐处理的藻类中发现了最高的脂质含量（21.9%）。此外，与不含硒的藻类相比，亚硒酸盐和硒酸盐处理的藻类的氢气产量分别提高了 2.1 倍和 4.3 倍。在缺氧条件下，缺硫时，用亚硒酸盐处理的藻类通过积累和挥发去除硒的效率比用硒酸盐处理时高 2.3 倍，这与在好氧条件下得到的结果相反。
