粘土-MMH体系对赤潮生物的絮凝作用机制研究  

A STUDY ON THE COAGULATION OF CLAY-MMH SYSTEM WITH RED TIDE ORGANISMS

作　　者：孙晓霞[1] 宋秀贤[1] 张波[1] 俞志明[1] 

机构地区：[1]中国科学院海洋研究所,青岛266071

出　　处：《海洋科学》1999年第2期46-49,共4页Marine Sciences

基　　金：国家自然科学基金!49406072号;国家自然科学基金!39790110号

摘　　要：根据粘土表面改性对其絮凝作用影响的理论模型，提出在粘土中引入 ＭＭＨ（混合 金属层状氢氧化物正电胶体）的改性方法；考察了ＭＭＨ浓度及ＰＨ值对絮凝作用的影响。 结果表明，粘土中引入ＭＭＨ后，显著提高了对赤潮异弯藻（Ｈｅｔｅｒｏｓｉｇｍａ　ａｋａｓｈｉｗｏ）和新月菱形 藻（Ｎｉｔｚｃｈｉａ　ｃｌｏｓｔｅｒｉｕｍ）的去除效率，二者的适宜配比为ＭＭＨ：粘土＝０．１ｇ：１ｇ。在此基础上， 进一步研究了ＭＭＨ促进粘土絮凝作用的机制，发现其去除赤潮生物的效率与改性后表面 电性呈正相关，相关系数Ｒ＝０．９３，与以前提出的理论模型一致。According to theoretical model on effect of surface modification of clays on coagulation, the improved method adding MMH (Mixed Metal Layered Hydroxide) in clays is proposed. The impacts of MMH concentration and pH are examined. The results show that the removal rates of Helerosigma akashiwo and Nitzchia closterium increase markedly due to addition of MMH and MMH:Clay=0. 1 g: 1 g is thought to be a suitable proportion. The mechanism of MMH promoting the coagulation is studied and the removal rates of H. akashiwo show a positive linear relationship with surface potential of modified clay particles, R^2= 0. 86, which is in accord with the model put forward in the previous papers.

关 键 词：粘土 MMH 絮凝作用 赤潮生物 海洋污染 红潮 

分 类 号：X55[环境科学与工程—环境工程]