Why is it important to remove turbidity before disinfection?

Removing turbidity before disinfection is crucial because turbidity can shield pathogens from disinfectants like chlorine. When water is turbid, suspended particles can physically obstruct the chlorine from coming into contact with microorganisms. This shielding effect means that even if chlorine is present, its effectiveness in neutralizing pathogens is diminished as it cannot penetrate the particles to reach the bacteria, viruses, or protozoa that may be present.

By reducing turbidity, the disinfection process becomes much more effective, ensuring that the chlorine can interact directly with the pathogens, thus achieving the desired reduction in harmful microorganisms. This is particularly vital for ensuring safe drinking water, as proper disinfection is essential to protect public health from waterborne diseases.