1 / 20

Risk Management

Risk Management. fo r. Drinking-Water Supplies. using. New Zealand Public Health Risk Management Plan Guidelines. Drinking-water quality management. There are two principal components to drinking -water quality management:. Product quality control [QC].

ryder
Télécharger la présentation

Risk Management

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Risk Management for Drinking-Water Supplies using New Zealand Public Health Risk Management Plan Guidelines

  2. Drinking-water quality management There are two principal components to drinking-water quality management: • Product quality control [QC] • Monitors compliance with standards • QC tells you something has gone wrong after it had happened • Process quality assurance [QA] • Uses risk management • QA tries to stop something going wrong

  3. Summary of PHRMP process • Make a flow chart of the supply • Identify the supply elements in the supply Risk Assessment • Identify the public health risks for each supply element • Rank the risks according to their magnitude Risk Management • Identify the options [preventive & remedial] for managing each risk • Assess the resources [dollars, staff, expertise,equipment] needed for each option • Decide on the order of priority for managing each risk [use a cost benefit approach] • Develop a programme for managing each risk.

  4. RiskAssessment

  5. Water Supply Flow Chart Dosing Pump NaOCl Tank Distribution Pipework Bore Pump Storage Reservoir Shallow Bore Huia Flats Community

  6. Components of a water supply The four components of a water supply system are: • The catchment Supplies the raw water for the supply • The treatment plant Purifies the raw water to make it safe for drinking • The reticulation [or distribution system] Conveys the drinking-water from the treatment plant to the user’s system • The user’s system May be a complex system of pipes and tanks, or as simple as a water jug.

  7. Barriers to contamination Check the presence of the four barriers to contamination: • Prevention of contamination of the raw water • Removal of particles from the water • Inactivation of any germs in the water • Prevention of recontamination after treatment

  8. Elements of a drinking-water supply The supply elements of a drinking-water supply are considered in four groups: ·               Raw water catchment ·               Treatment plant ·               Distribution ·               Use

  9. Accident Sabotage Particles Illegal Connection Catch- Treat- ment ment Distribution Solutes Animals, birds Chemicals in reservoir Backflow Excrement Microbes Cross-connections

  10. Treatment Plant Elements [1] The treatment plant elements considered are: ·Algicide application ·Destratification ·Pre-oxidation ·Waste-liquor re-introduction ·Conventional coagulation/flocculation/sedimentation ·Dissolved air flotation ·Direct filtration ·Rapid sand filtration ·Slow sand filtration ·Cartridge filtration ·Diatomaceous earth filtration ·Membrane filtration

  11. Treatment Plant Elements [2] ·Chlorine disinfection ·Chlorine dioxide disinfection ·Ozone disinfection ·Ultra-violet irradiation disinfection ·pH adjustment ·Iron and manganese removal ·Softening ·Trace organics removal ·Fluoridation ·Pump operation ·Treatment plant construction and operation

  12. PHRMP Guides [1] A PHRMP Guide is produced for each element of a drinking-water supply. To assist Risk Assessment, for each element the Guide shows: ·   The events which could give rise to public health consequences. In this element ·      How this element is influenced by, or influences, other supply elements. ·     The event linked to this supplyelement that creates the greatest risk to public health; ·    The public health hazard each event may introduce into the water. ·        A rough guide to the level of risk due to each event. ·        Possible causes of each event.

  13. Important concepts (1)

  14. Important concepts (2)

  15. RISK MANAGEMENT

  16. PHRMP Guides [2] To assist Risk Management, For each element the Guide shows: • ·Preventive measures for each cause. • ·Details of checks to decide whether the preventive measures are working. • ·Corrective actions that should be taken should an event happen. • ·The most important measures that can be taken to prevent/ minimise the effects of this event.

  17. PHRMP Guide layout

  18. Developing a Water Safety Plan Risk Management Part 2 (recap) • Decide the order of priority for managing each risk [use a benefit /cost approach] • Decide the order in which to make improvements • Develop a programme for managing the risks. • Prepare an improvement schedule, taking into account the available resource • Define the responsibilities for implementing the plan • Specify a date for reviewing the plan.

  19. Derive WSP for supply from system guides Risk management plan ~improvement schedule

  20. PHRMP Information Sources • How to Prepare and Develop Public Health Risk Management Plans for Drinking-Water Supplies 2001: Ministry of Health, Wellington, New Zealand. or Wickliffe [04] 496 2277 • The Public Health Risk Management Guides [for the various process elements] Ministry of Health Web Site www.MOH.govt.nz\publications\ online publications\July2001 • AS/NZS/ISO 9000 series:, Quality Management Systems – Requirements • AS/NZS 4360:1999, Risk Management • Framework for Management of Drinking-Water Quality: NHMRC/ARMCANZ Coordinating Group, Australia [Planned for mid 2002]

More Related