With uncertainty regarding requirements for future use of chlorine gas due to safety concerns and challenges associated with chlorinated disinfection byproducts (DBPs) for gaseous or liquid chlorine, wastewater facilities are proactively looking for options to replace chlorination with disinfection alternatives.
The increased interest in alternatives has pushed technology and efficiency advances in mature as well as in innovative technologies that have been historically used in other industries. While the advances in ultraviolet (UV) and ozone disinfection make the technology more energy efficient, there sometimes are challenges, including high capital costs and consistent disinfection performance for facilities with high peaking factors or difficult effluent quality (e.g., low UV transmittance or high ozone demands)… Katherine Y. Bell and Jyh-Wei Sun are senior wastewater process engineers for CDM Smith. Angela Thompson is a microbiologist for FMC Peroxygens.