| 本文已被：浏览 1408次 下载 1232次 |
码上扫一扫！ |
|
|
| 铁铝复合改性粘土去除藻华生物的效率与机制初探 |
|
姜凯钦1,2,3,4, 俞志明1,2,3,4, 曹西华1,2,3,4, 姜文彬1,2,3,4, 宋秀贤1,2,3,4
|
|
1.中国科学院海洋研究所 海洋生态与环境科学重点实验室 青岛 266071;2.青岛海洋科学与技术试点国家实验室 海洋生态与环境科学功能实验室 青岛 266237;3.中国科学院海洋大科学研究中心 青岛 266071;4.中国科学院大学 北京 100049
|
|
| 摘要: |
| 粘土表面改性是提高粘土絮凝有害藻华效率的重要方法。本文融合铁系与铝系絮凝剂的优点，将两者复合，制备出了不同Fe含量的铁铝复合改性粘土，考察其对东海原甲藻（Prorocentrum donghaiense）、赤潮异弯藻（Heterosigma akashiwo）和塔玛亚历山大藻（Alexandrium tamarense）的去除效率。结果表明，铁的复合对原改性粘土去除藻华生物的效率具有提升作用，该作用随Fe含量的增加而增大，最高可达20%—30%。本研究还采用Zeta电位仪和粒子成像测速仪测定了复合改性粘土在海水中的表面特征和絮凝特性，发现与原改性粘土相比，铁铝复合改性粘土体系中，随Fe含量的增多，粘土表面电位最高可提升15%；稳定絮凝体指数（γ）降低，絮体强度增加。因此，Fe盐的引入，可以有效提高改性粘土颗粒表面正电性和絮体的抗破坏能力，从而增强改性粘土的絮凝除藻效果。 |
| 关键词: 铁铝复合改性粘土 有害藻华 表面电性 絮体强度 |
| DOI：10.11693/hyhz20201200334 |
| 分类号:X55 |
| 基金项目:山东省重大科技创新工程项目，2019JZZ010808号；国家重点研发计划，2017YFC1404300号；2019年度“泰山学者攀登计划”资助项目。 |
|
| REMOVAL EFFICIENCY AND MECHANISM OF ALGAL BLOOM ORGANISMS USING POLY-Al-Fe COMPOSITE MODIFIED CLAY |
|
JIANG Kai-Qin1,2,3,4, YU Zhi-Ming1,2,3,4, CAO Xi-Hua1,2,3,4, JIANG Wen-Bin1,2,3,4, SONG Xiu-Xian1,2,3,4
|
|
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, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China;3.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;4.University of Chinese Academy of Sciences, Beijing 100049, China
|
| Abstract: |
| The clay surface modification is a key method of improving the flocculation efficiency of harmful algal blooms with modified clay. In this paper, the advantages of Fe and Al series cationic flocculants were combined to prepare poly-Al-Fe composite modified clays with different Fe contents. The removal efficiency of Prorocentrum donghaiense, Heterosigma akashiwo, and Alexandrium tamarense by the composite modified clay was investigated, which showed that the removal efficiency could be improved by 20%-30% with the increase of Fe content. The Zeta potential meter and particle imaging velocimetry were used to study the surface characteristics and flocculation characteristics of the composite-modified clay in seawater. The results show that, compared with PAC-MC (polyaluminum chloride modified clay), the removal efficiency of the poly-Al-Fe composite modified clay increased with Fe content, the clay surface potential was increased by 15%, the stable floc index (γ) was decreased, and the stability of flocs was improved, thus, the flocculation and algae removal ability of the modified clay could be enhanced. |
| Key words: poly-Al-Fe composite modified clay harmful algal bloom surface electrical floc strength |