Quantitative Microbial Risk Assessment

Past Projects

Quantitative Microbial Risk Assessment for the discharge of treated meat processing factory wastewater into the Mataura River

To support a new discharge consent application for Alliance Group, Dr Dada conducted a microbial assessment that provided scientifically-robust information as to whether or not the Alliance Plant Mataura discharges have a ‘more than minor’ effect on the state of the receiving environment for recreational uses. QMRA was done utilizing predefined dose-response functions for zoonotic bacterial and protozoan pathogens relevant to human health (Salmonella, Campylobacter, E.coli 0157: H7, Giardia, Cryptosporidium).

Quantitative Microbial Risk Assessment for the discharge of treated wastewater from the Opononi WWTP into the Hokianga Harbour.

As part of the process of renewing its consents for the Opononi wastewater treatment plant (WWTP) discharge into the Hokianga Harbour, Dr Dada conducted a QMRA study to assess the level of risk to public health with a focus on recreational swimming and food gathering areas at sites that are within the area between where the discharge leaves the channel and the shore.

Quantitative modelling of public health risk associated with stormwater network improvements

Quantitative Microbial Risk Assessment for the discharge of treated wastewater at Army Bay WWTP.

A projected 4x increase in the population of the Hibiscus Coast area north of Auckland over the next 35 years indicates the need for significant investment in new wastewater infrastructure. One option being considered is to retain the existing discharge location for the Army Bay Wastewater Treatment Plant (WWTP). To support the application, Dr Dada  conducted a quantitative microbial risk assessment (QMRA) of the proposed discharge in relation to the risk of illness to swimmers and individuals who consume harvested raw shellfish.

Quantitative Microbial Risk Assessment for the discharge of treated wastewater from the Opononi WWTP into the Hokianga Harbour

As part of the process of renewing consents for the Kohokohu wastewater treatment plant (WWTP) discharge into the Hokianga Harbour, Dr Dada conducted a QMRA study to assess the level of risk to public health with a focus on recreational swimming and food gathering areas at sites that are within the area between where the discharge leaves the channel and the shore.

Working with monitoring data, historical data and time series data of contaminant concentrations generated from hydrodynamic models, Dr Dada utilized dose-response functions for pathogens relevant to human health to assess the efficacy of proposed stormwater network improvements in the Gisborne Region. The QMRA identified the network improvements that would be required to eliminate the risk of illness to swimmers and individuals who consume raw shellfish harvested from Poverty Bay and the Taruheru River (Gisborne).

Quantitative Microbial Risk Assessment for the discharge of treated wastewater into Whitford Embayment through Turanga Creek

To support a technical input into an AEE report as part of a variation of current consent conditions for a proposed residential development in Whitford, Auckland, Dr Dada conducted a quantitative microbial risk assessment (QMRA) of the proposed discharge in relation to the risk of illness to swimmers and individuals who consume harvested raw shellfish. The QMRA was able to determine treatment requirements (in terms of effluent virus concentrations) sufficient to reduce the risk of illness to swimmers and individuals who consume harvested raw shellfish to acceptable levels.

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