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Study on the coagulation of four species of red tide organisms(Nitzschia pungens,Skeletonema costatum,Prorocentrum minimum and Noctiluca scintillans)with montmorillonite,and the effect ofmontmorillonite pretreatment on the coagulation shows that the capability for montmorillonite to coagu-late with them is in the order:N.pungens>S.costatum>P.minimum>N.scintillans.Thecoagulation is discussed from the aspects of the structure,shape,size,movement,habit,etc.of differ-ent species and the results are explained theoretically.The experimental results also indicate that the treat-ment of montmorillonite with acid can enhance its coagulating capability.This is due to the fact that Al(OH_2)_6~(+3),exchanged from the clay lattice by hydrogen ion H~+,forms hydroxy-aluminum polymers on thesurface of the montmorillonite.The hydroxy-aluminum polymers positively charge and increase the positivecharacteristic of the clay surface,and also serves as a bridge between adjacent surfaces of particles.Thesetwo functions enhance
Study on the coagulation of four species of red tide organisms (Nitzschia pungens, Skeletonema costatum, Prorocentrum minimum and Noctiluca scintillans) with montmorillonite, and the effect ofmontmorillonite pretreatment on the coagulation that the capability for montmorillonite to coagu-late with them is in the order: N.pungens> S.costatum> P.minimum> N.scintillans.Thecoagulation is discussed from the aspects of the structure, shape, size, movement, habit, etc.of differ-ent species and the results are explained theoretically. The experimental results also indicate that the treat-ment of montmorillonite with acid can enhance its coagulating capability. This is due to the fact that Al (OH_2) _6 ~ (+3), exchanged from the clay lattice by hydrogen ion H ~ +, forms hydroxy-aluminum polymers on thesurface of the montmorillonite.The hydroxy-aluminum polymers positively charge and increase the positivecharacteristic of the clay surface, and also serves as a bridge between adjacent surfaces of particles.Thesetwo functions enhance