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Inactivation of Cryptosporidium

Project Number # 3013

Inactivation of Cryptosporidium across the wastewater treatment train: Recycled water fit for purpose (Phase II)

Status:  Completed

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Background and Relevance

Cryptosporidium is a problematic organism for the water industry, having a significant impact on wastewater treatment processes targeted for recycling. This is due to the potential exposure of the community to the parasite through the third pipe system (with irrigation and toilet flushing), irrigation of agricultural crops and municipal irrigation. The ever-present risk of Cryptosporidium has therefore required the implementation of additional treatment processes where recycling is utilized, which may include alternative disinfection methods such as UV and ozone (due to the innate resistance to chlorine based disinfection) while sometimes requiring filtration for effective oocyst removal.

Cryptosporidium species are currently monitored in wastewaters using standard detection methodologies (USEPA 1622 and 1623) and more recently 1623.1. However, these methods provide no information on the infectivity of the detected oocysts.

Project Documents