Which disinfectant is usually the best for large-diameter pipes or very long pipelines?

Chlorine gas is typically the preferred disinfectant for large-diameter pipes or very long pipelines due to its effectiveness in achieving consistent disinfection over extended distances. It has a strong residual effect, which means that as water travels through long pipelines, chlorine continues to provide protection against pathogens and maintains the water quality. The ability of chlorine to penetrate and act upon biofilms, which can form on the interior surfaces of pipes, enhances its capacity to disinfect effectively, making it suitable for systems where the disinfectant must travel significant lengths before reaching the consumer.

Additionally, chlorine gas is relatively cost-effective and widely available, which suits the operational needs of many water treatment facilities. Its established protocols for dosage and residual monitoring align well with standard practices in water treatment, ensuring that the appropriate levels can be maintained throughout the treatment and distribution process. These features make chlorine gas an advantageous choice for larger systems that require reliable and sustained disinfection.