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超声改性对不同粘土去除藻华生物效率的影响
姜文彬1,2,3, 俞志明1,2,3, 曹西华1,2, 邱丽霞1,2,3, 宋秀贤1,2,3
1.中国科学院海洋生态与环境科学重点实验室(中国科学院海洋研究所) 青岛 266071;2.青岛海洋科学与技术国家实验室 海洋生态与环境科学功能实验室 青岛 266071;3.中国科学院大学 北京 100049
摘要:
粘土表面改性方法是提高改性粘土絮凝有害藻华效率的关键。本文研究了超声改性法对粘土去除藻华生物效率的影响,对比分析了粘土颗粒在改性前后的粒度分布、扫描电镜图像以及表面电位等理化特征变化,进而初步探讨了超声改性的作用机制。结果显示,超声改性处理可以有效提高本研究中所试验五种粘土去除藻华生物能力。超声改性导致粘土颗粒粒径进一步减小,且超声时间越长,颗粒粒径越小;超声处理后的粘土粒度分布集中、颗粒均匀,延长超声处理时间可以有效提高增效效果。同时发现,超声改性后粘土颗粒的表面电位负电性变弱,降低了粘土颗粒与表面负电性藻细胞之间的静电斥力,从而提高了粘土对藻华生物藻细胞的絮凝去除能力。本研究探索了提高粘土去除藻华生物效率的新方法,为进一步增强改性粘土去除能力提供了参考。
关键词:  粘土  超声改性  有害藻华  治理效率
DOI:10.11693/hyhz20171200312
分类号:X55
基金项目:国家重点研发计划资助项目,2017YFC1404300号;青岛海洋科学与技术国家实验室鳌山科技创新计划,2016ASKJ02-3号;青岛海洋科学与技术国家实验室鳌山人才计划资助,2017ASTCP-OS16号。
EFFECT OF ULTRASONIC MODIFICATION OF DIFFERENT CLAYS ON ALGAE REMOVAL EFFICIENCY
JIANG Wen-Bin1,2,3, YU Zhi-Ming1,2,3, CAO Xi-Hua1,2, QIU Li-Xia1,2,3, SONG Xiu-Xian1,2,3
1.CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;3.University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:
The clay surface modification is to improve the efficiency of harmful algal blooms flocculation with modified clay. We studied the effect of ultrasonic modification of clays on algae removal. We compared the changes of clay particle properties before and after ultrasonic treatment in particle size distribution, SEM images, and surface potentials, and discussed the mechanism. Ultrasound modification could reduce the particle size of the clay; the longer the ultrasonic time, the smaller the particle size. The particle size distribution of the clay after ultrasonic treatment was concentrated, the particles became evener, and prolonged sonicating time could effectively enhance the synergistic effect. Meanwhile, after ultrasonic modification, the negative electricity of the clay particles became weaker, which reduced the electrostatic repulsion between the clay particles and the surface negatively charged algal cells, thus improving the flocculation removal ability of the clay on the algal cells. This method could enhance the removal algae efficiency of clays, and provide a reference for enhancing the removal ability of modified clay.
Key words:  clay  ultrasonic modification  harmful algal bloom  disposal efficiency
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