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| DPQAC-PAC-MC复合改性粘土在不同介质中的絮凝行为研究 |
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吴婷1,2, 曹西华2,3,4,5, 俞志明2,3,4,5, 宋秀贤2,3,4,5, 姜文彬2,3,4,5, 袁涌铨2,3,4,5, 吴在兴2,3,4,5, 贺立燕2,3,4,5, 范子初6
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1.中国海洋大学海洋生命学院 青岛 266003;2.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;3.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;4.中国科学院大学 北京 100049;5.中国科学院海洋大科学研究中心 青岛 266071;6.国家海洋局秦皇岛海洋环境监测中心站 秦皇岛 066002
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| 摘要: |
| 改性粘土法絮凝消除浮游微藻是我国迄今唯一得到大规模应用的有害赤潮应急处置方法，研发安全高效的改性粘土材料是该方法发展的重要方向之一。本文研究了双烷基聚氧乙烯基三季铵盐（DPQAC）与聚合氯化铝（PAC）复合改性粘土获得新材料DPQAC-PAC-MC在去离子水、海水及东海原甲藻藻液（Prorocentrum donghaiense）等不同介质中的絮凝行为，分析了水体中硫酸根离子和藻源胞外有机质（extracellular organic matters，EOMs）对其影响，探讨了该复合改性粘土高絮凝性能的成因与机制，为该类型改性粘土进一步增效优化及应用推广提供参考。研究结果表明，与双烷基聚氧乙烯基三季铵盐改性粘土（DPQAC-MC）、聚合氯化铝改性粘土（PAC-MC）等单组分改性粘土相比，DPQAC-PAC-MC表现出更强的絮凝能力，但在不同介质中其絮凝行为差异明显。其中，在藻液中形成的絮凝体颗粒更大、强度更高、再生能力更强、生长速度更快。介质中的硫酸根离子或胞外有机质都可促进DPQAC-PAC-MC的絮凝，并且具有最佳促凝浓度，硫酸根离子浓度为10-3 mol/L，EOMs浓度为50%含量，在此浓度之前随浓度增加，絮凝体生长时间缩短、强度增加、絮凝效果提升；超过最佳浓度后，促凝效果随浓度的进一步增加而降低。对影响DPQAC-PAC-MC在藻液中絮凝行为的分析发现：（1）复合改性有效提高了颗粒的表面正电性，长链大分子增强了颗粒间的桥联聚结作用，从而增强了粘土颗粒的自身絮凝能力；（2）赤潮暴发水体中大量存在的硫酸根离子、EOMs可以进一步增效复合改性粘土颗粒的絮凝聚结能力。 |
| 关键词: 赤潮治理 复合改性粘土 絮凝行为 聚合氯化铝 季铵盐 |
| DOI：10.11693/hyhz20200400118 |
| 分类号:X55 |
| 基金项目:国家自然科学基金资助项目，41976145号，41576119号；广西创新驱动发展专项资金资助项目，桂科AA17202020-4号。 |
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| COAGULATION OF DPQAC-PAC COMPOSITE MODIFIED CLAY IN DIFFERENT MEDIA |
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WU Ting1,2, CAO Xi-Hua2,3,4,5, YU Zhi-Ming2,3,4,5, SONG Xiu-Xian2,3,4,5, JIANG Wen-Bin2,3,4,5, YUAN Yong-Quan2,3,4,5, WU Zai-Xing2,3,4,5, HE Li-Yan2,3,4,5, FAN Zi-Chu6
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1.College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China;2.CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;3.Laboratory of Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China;4.University of Chinese Academy of Sciences, Beijing 100049, China;5.Center for Ocean Mega Science, Chinese Academy of Sciences, Qingdao 266071, China;6.Qinhuangdao Marine Environmental Monitoring Central Station, State Oceanic Administration(SOA), Qinhuangdao 066002, China
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| Abstract: |
| Modified clay is the only method for harmful red tide mitigation, which has been successfully applied in several large-scale fields in China. In this study, coagulation of DPQAC-PAC composite modified clay (DPQAC-PAC-MC) were studied in deionized water, seawater, and in Prorocentrum donghaiense, and the influences of sulfate ions and algal extracellular organic matters (EOMs) in culture water were analyzed, and the mechanisms of DPQAC-PAC-MC coagulation were analyzed. Results show that DPQAC-PAC-MC presented the best coagulation performance among others. The coagulation behavior of DPQAC-PAC-MC varied obviously in different media. In the culture of Prorocentrum donghaiense, the growth time of flocs was shortened, the strength was increased, and the flocculation effect was improved. When the optimal concentration was exceeded, the coagulation promoting effect decreased with the further increase of the concentration. The coagulation efficiency of DPQAC-PAC-MC could be improved with sulfate ions and EOMs. The excellent coagulating behavior of DPQAC-PAC-MC was resulted from:(1) the increasing of the positive surface potential and the bridge ability of the composite clay particles after modification; (2) a large number of sulfate ions and EOMs particles in algal cultures. |
| Key words: red tide control composite modified clay coagulating behavior poly aluminum chloride quaternary ammonium compounds |
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