Profiles of and variations in aluminum species in PAC-MC used for the removal of blooming microalgae  

作　　者：Xueyi Dong Xihua Cao Wenbin Jiang Xiuxian Song Zhiming Yu Shitao Yu 

机构地区：[1]College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China [2]CAS Key Laboratory of Marine Ecology and Environmental Sciences,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [3]Functional Laboratory of Marine Ecology and Environmental Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China [4]University of Chinese Academy of Science,Beijing 100049,China [5]Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao,266071,China

出　　处：《Journal of Environmental Sciences》2021年第8期76-82,共7页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.41976145);the Taishan Scholars Climbing Program of Shandong Province of 2019;the Science and Technology Major Project of Guangxi(No.AA17202020-4);。

摘　　要：Polyaluminum chloride modified clay(PAC-MC)is a safe and efficient red tide control agent that has been studied and applied worldwide.Although it is well known that the distribution of hydrolytic aluminum species in PAC affects its flocculation,little is known about the influence of particulars aluminum species on the microalgae removal efficiency of PAC-MC;this lack of knowledge creates a bottleneck in the development of more efficient MCs based on aluminum salts.The ferron method was used in this study to quantitatively analyze the distributions of and variations in different hydrolytic aluminum species during the process of microalgae removal by PAC-MC.The results showed that Ala,which made up 5%–20%of the total aluminum,and Alp,which made up 15%–55%of the total aluminum,significantly affected microalgae removal,with Pearson’s correlation coefficients of 0.83 and 0.89,respectively.Most of the aluminum in the PAC-MC sank rapidly into the sediments,but the rate and velocity of settlement were affected by the dose of modified clay.The optimal dose of PAC-MC for precipitating microalgae was determined based on its aluminum profile.These results provide guidance for the precise application of PAC-MC in the control of harmful algal blooms.

关 键 词：Modified clay Red tide Aluminum species Microalgal removal efficiency Ecological safety 

分 类 号：X55[环境科学与工程—环境工程]