Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, 8 Wudayuan Road, Wuhan 430223, China.
Department of Biotechnology, Noida International University, Yamuna Expressway, Gautam Budh Nagar, Uttar Pradesh 202001, India.
Water Sci Technol. 2017 Jun;75(12):2777-2783. doi: 10.2166/wst.2017.156.
Diatom algae are known to play an important role as primary producers in many diverse ecosystems, including artificial aquaculture ponds where they also aid in maintaining water quality by consuming excess nutrients. But factors influencing their growth are still poorly understood. In the present study the effect of micronutrients, N:P ratio and silica concentration on benthic diatom Synedra sp. grown in fish pond waste water was studied along with nutrient removal efficiency. We have studied nine different treatments, of which addition of micronutrient mixture Nualgi along with adjusted N:P to 6:1 resulted in highest cell density, followed by silicate enrichment, whereas only N:P adjustment and Nualgi addition had no significant effect on diatom growth. At the end of the growth experiment, the N removal efficiencies of treatment groups (50.23%-65.44%) were significantly higher (P < 0.05) than that of the control group (43.56%), whereas phosphate removal efficiency was significantly higher (P < 0.05) with Nualgi and N:P adjustment (53.37%-68.98%). The silicate consumption was significantly higher in the control group, at 63.87%, than in other experimental groups. These results will give us a new insight into important factors influencing beneficial algae growth and simultaneous nutrient removal from aquaculture waste water.
硅藻在许多不同的生态系统中作为初级生产者起着重要作用，包括人工水产养殖池塘，它们通过消耗过量的营养物质来帮助维持水质。但影响其生长的因素仍知之甚少。在本研究中，研究了微量元素、N:P 比和硅浓度对在鱼塘废水中生长的底栖硅藻 Synedra sp. 的影响，以及营养物质去除效率。我们研究了九种不同的处理方法，其中添加微量元素混合物 Nualgi 并将 N:P 调整到 6:1 会导致最高的细胞密度，其次是硅酸盐富化，而仅调整 N:P 和添加 Nualgi 对硅藻生长没有显著影响。在生长实验结束时，处理组的氮去除效率（50.23%-65.44%）明显高于对照组（43.56%），而磷去除效率在 Nualgi 和 N:P 调整时明显更高（53.37%-68.98%）。与其他实验组相比，对照组的硅酸盐消耗（63.87%）明显更高。这些结果将使我们对影响有益藻类生长和同时从水产养殖废水中去除营养物质的重要因素有新的认识。
