Abstract: A series of organic guanidine-based biological slime disperants have been synthesized, with oil-based guanidinium acetate GA5 presenting the best performance. It demonstrated favorable dispersion capacity on biological slime and excellent bactericidal activity against heterotrophic bacteria, sulfate-reducing bacteria and iron bacteria. When its mass concentration exceeded 10 mg/L, the dispersion efficiency on biological slime was evaluated over 70% through the photoelectric effect method, significantly outperforming existing chemicals. The dispersion efficiency was almost unaffected with the total alkalinity at 0-600 mg/L and calcium hardness at 0-1000 mg/L. It was found that this guanidine derivative has minimal interaction with corrosion and scale inhibitors, demonstrating their good compatibility. This compound could effectively reduce the surface tension, infiltrate and penetrate into the biological slime, and disperse it into tiny particles.

Key words: biological slime, organic guanidine, dispersion, bactericidal, corrosion and scale inhibitor