School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China.
School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China; State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
J Hazard Mater. 2015 May 30;289:38-45. doi: 10.1016/j.jhazmat.2015.02.012. Epub 2015 Feb 7.
Microalgae are attracting attention due to their potentials in mitigating CO2 emissions and removing environmental pollutants. However, harvesting microalgal biomass from diluted cultures is one of the bottlenecks for developing economically viable processes for this purpose. Microalgal cells can be harvested by cost-effective sedimentation when flocculating strains are used. In this study, the removal of Zn(2+) and Cd(2+) by the flocculating Chlorella vulgaris JSC-7 was studied. The experimental results indicated that more than 80% Zn(2+) and 60% Cd(2+) were removed by the microalgal culture within 3 days in the presence up to 20.0mg/L Zn(2+) and 4.0mg/L Cd(2+), respectively, which were much higher than that observed with the culture of the non-flocculating C. vulgaris CNW11. Furthermore, the mechanism underlying this phenomenon was explored by investigating the effect of Zn(2+) and Cd(2+) on the growth and metabolic activities of the microalgal strains. It was found that the flocculation of the microalga improved its growth, synthesis of photosynthetic pigments and antioxidation activity under the stressful conditions, indicating a better tolerance to the heavy metal ions for a potential in removing them more efficiently from contaminated wastewaters, together with a bioremediation of other nutritional components contributed to the eutrophication of aquatic ecosystems.
微藻因其在缓解 CO2 排放和去除环境污染物方面的潜力而受到关注。然而，从稀释培养物中收获微藻生物质是开发经济可行的方法的瓶颈之一。当使用絮凝菌株时，微藻细胞可以通过具有成本效益的沉降来收获。在这项研究中，研究了絮凝小球藻 JSC-7 对 Zn(2+)和 Cd(2+)的去除作用。实验结果表明，在存在高达 20.0mg/L Zn(2+)和 4.0mg/L Cd(2+)的情况下，微藻培养物在 3 天内可去除超过 80%的 Zn(2+)和 60%的 Cd(2+)，这比非絮凝小球藻 CNW11 的培养物观察到的去除率要高得多。此外，通过研究 Zn(2+)和 Cd(2+)对微藻菌株生长和代谢活性的影响，探讨了这种现象的机制。结果发现，在胁迫条件下，微藻的絮凝提高了其生长、光合色素的合成和抗氧化活性，表明其对重金属离子有更好的耐受性，从而更有效地从受污染废水中去除它们，同时还对其他营养成分进行生物修复，有助于水生生态系统的富营养化。
