Water Safety Plans Melbourne Water Case Study

Transcription

1 Water Safety Plans Melbourne Water Case Study Asia Pacific WSP Network Participants Symposium Singapore 4 June 2014 Dr Melita Stevens, Principal Scientist

2 Where is Melbourne? Singapore Melbourne

3 Melbourne Water supply system Government-owned wholesale supplier of drinking water 3.5 million customers via 3 retailers 10 storage reservoirs (3000ML to 1068 GL = 800MG to 282,000 MG) Primarily sourced from large forested and protected catchments. Sewage treatment and supply of recycled water Lagoon-based treatment and tertiary treatment Drainage responsibility for Melbourne area Flood management Aquatic ecology and pollution

4 Drinking Water Safety Plans in Australia Australian Drinking Water Guidelines have adopted a risk management approach based on the principles of HACCP (2006). Hazard Analysis and Critical Control Point developed in the 1960s by Pillsbury and NASA, Codified by WHO and used as the basis for water safety plans since early 2000s. Australia involved in the development of Water Safety Plan guidance for the 3 rd Edition of Guidelines for Drinking-water Quality. All States and Territories have adopted the Australian Drinking Water Guidelines. In Victoria the Safe Drinking Water Act and Regulations require the development of a risk management plan for drinking water, audited annually by an independent certified auditor since 2005.

5 Risk Management Approach Drinking Water and Recycled Water Rigorous risk management approach adopted to enable Melbourne s drinking water supply to remain unfiltered community expectations Risk-based management systems reviewed in Australia in late 1990s Hazard Analysis Critical Control Point adopted as basis for Drinking Water Quality Risk Management Plan in 2000 Melbourne Water Certified for HACCP for drinking water in 2000 HACCP certification gained for recycled water production at Western and Eastern Treatment Plants. Sewerage system certified for ISO22000 since 2007 Drinking water planned certification ISO22000 (HACCP + ISO9001)

6 WSPs in Melbourne started with HACCP FSANZ considered if water was a food Pressure on utilities from food producers Needed to assure consumers water was safe

7 Risk Management Approach Drinking Water and Recycled Water Rigorous risk management approach adopted to enable Melbourne s drinking water supply to remain unfiltered Risk-based management systems reviewed in Australia in late 1990s Hazard Analysis Critical Control Point adopted as basis for Drinking Water Quality Risk Management Plan in 2000 Melbourne Water Certified for HACCP for drinking water in 2000 HACCP certification gained for recycled water production at Western and Eastern Treatment Plants. Sewerage system certified for ISO22000 since 2007 Drinking water planned certification ISO22000 (HACCP + ISO9001)

8 Our Water Safety Plan for Drinking Water Underpinned by extensive risk assessment from catchment to tap. Consistent with the approach in the WHO Guidelines for Drinking water Quality and the Australian Drinking Water Guidelines (2011). Used the Codex Decision Tree from the Codex Alimentarius (WHO) 5 Critical Control Points and 4 Quality Control Points

9 CCPs and QCPs Critical Control Points CCP1 Primary Disinfection CCP2 ph Correction (at primary chlorination sites) CCP3 Filtration (at 2 sites) CCP4 Filtration (at 3 sites) CCP5 Flouridation Quality Control Points QCP1 Secondary disinfection (for biofilm growth) QCP2 ph Correction (carbon dioxide) QCP3 ph Correction (at chloramination sites) QCP4 Primary Disinfection (upper concentration for taste and odour)

10 Water Guidelines based on HACCP/WSPs Australian Guidelines for Water Recycling uses WHO health-based target 1 microdaly. Australian Drinking Water Guidelines 2006 included Risk-Based Framework, including principles of HACCP. Drinking water guidelines review to adopt health-based target of 1 microdaly. Guidance will focus on sanitary survey, catchment source category and treatment log reductions.

11 Thank You