What are the potential operational challenges of using UV disinfection for wastewater with high turbidity and how can these challenges be mitigated?

UV disinfection uses ultraviolet (UV) light to inactivate pathogens in wastewater. A major operational challenge with UV disinfection is high turbidity, which is the measure of the cloudiness or haziness of a fluid caused by individual particles that are generally invisible to the naked eye, similar to smoke in air. High turbidity reduces UV disinfection effectiveness because it interferes with UV light transmission. The particles in the water absorb and scatter the UV light, preventing it from reaching and inactivating the pathogens. This is referred to as shielding. The greater the turbidity, the less UV light penetrates the water, and the less effective the disinfection process becomes. This can lead to non-compliance with discharge permits if pathogen levels are not adequately reduced. Another challenge is the potenti....