微生物复合改性粘土去除东海原甲藻(Prorocentrum donghaiense)初探

近年来,随着对抑藻微生物认识的深入,利用藻-菌相互作用控制有害藻华展现出极大的应用前景。在前期改性粘土治理有害藻华方法的基础上,首次将不同种类的微生物与传统的改性粘土复合,研究了不同的复合比例、制备方式等对典型有害藻华生物——东海原甲藻(Prorocentrum donghaiense)去除效率的影响,初步探讨了其作用机制。结果表明:菌密度1.5×1010 cells/L的EM菌(effectivemicroorganisms,有效性微生物)及其滤液可以有效去除东海原甲藻;利用EM菌对粘土进行复合改性处理可以进一步提高改性粘土的除藻能力,呈现出1+12的效果。在适宜范围内,增加熟化时间与温度有利于复合改性粘土除藻效率的提升。文章进一步分析探讨了EM菌复合改性粘土的除藻机制,认为改性粘土通过富集EM菌和分泌的抑藻物质,增加了其对微藻的直接和间接除藻作用;适宜的熟化温度和熟化时间可促进EM菌的繁殖及其在改性粘土上的吸附,有利于复合改性粘土去除效率的提升。上述研究结果为改性粘土治理有害藻华技术的进一步提升和完善提供了新的探索。

RESEARCH ON MITIGATION OF PROROCENTRUM DONGHAIENSE BY MICRO-MODIFIED CLAY

With the deepening understanding of anti-algal microorganisms, application of algal-bacterial interaction to control harmful algal blooms has shown a great prospect. To develop a highly efficient and environment-friendly algal inhibition method, the effect of modified clay combined with algae inhibition bacteria on putting down Prorocentrum donghaiense bloom was studied. Results show that the effective microorganisms (EM) in concentration of >1.5×10¹⁰ cells/L could mitigate Prorocentrum donghaiense. The composite modification of clay with the EM effectively increased the rate of the algal removal. In the suitable range, increasing the time and temperature of treatment enhanced the algae removal efficiency. The method was shown environmental friendly for emergency elimination of harmful algal blooms and for long-term restoration of water quality as well.