臭氧氧化含有藻类的饮用水有时会对凝血产生有益影响。这些益处通常归因于藻类的细胞外有机物（EOM）。本研究主要研究从三种藻类中提取的EOM的性质。臭氧氧化降低了EOM的表观分子大小和疏水性。臭氧氧化也增加了EOM化合物的官能团电荷，但降低了胶体电荷滴定法测得的电荷。用提取的EOM进行的凝聚实验表明，中和带正电的乳胶粒子只需少量。臭氧对EOM没有显著影响，因此不会影响这些颗粒的凝聚。海藻酸是一种模型EOM化合物，与提取的EOM进行了比较，其表现与高分子量提取的EOM相似。包括30个参考文献、表格和图表。

Ozonation of drinking water containing algae sometimes produces beneficial effects on coagulation. These benefits are often attributed to the extracellular organic matter (EOM) from the algae. This study focused on the properties of extracted EOM from three species of algae. Ozonation of EOM reduced its apparent molecular size and hydrophobicity. Ozonation also increased the functional group charge of EOM compounds but decreased the charge as measured by the colloid charge titration. Coagulation experiments with extracted EOM indicated that only small amounts were necessary to neutralize positively charged latex particles. Ozone produced no significant effect on EOM and thus did not affect coagulation of these particles. Alginic acid, a model EOM compound, was compared with the extracted EOM and behaved similarly to the high-molecular-size extracted EOM. Includes 30 references, tables, figures.