Akvo - the control of legionella bacteria in bakery water systems

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The control of legionella bacteria in bakery water systems code has been approved by the health and safety commission with the consent of the secretary of state. It gives practical advice on how to comply with the law.

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Akvo - the control of legionella bacteria in bakery water systems

  1. 1. The control of legionella Bacteria in Water Systems June 2013 – Bakery Water Systems
  2. 2. IT HAS LEGAL STATUS This code has been approved by the health and safety commission with the consent of the secretary of state. It gives practical advice on how to comply with the law. If you follow the advice you will be doing enough to comply with the law in respect of those specific matters on which the code gives advice. You may use alternative methods to those set out in order to comply with the law. However the code has a special legal status. If you are prosecuted for breach of health and safety law, and it is proved that you did not follow the relevant provisions of the code, you will need to show that you have complied with the law in some other way or a court will find you at fault.
  3. 3. WHERE TO START Risk Assessment Schematic drawings of water systems Written Scheme of actions required to both monitor and control bacteria in water systems
  4. 4. RISK AREAS Any water system that has the potential to support legionella bacterial growth, and the means to create water droplets that can be inhaled.
  5. 5. LEGIONELLA GROWTH Food – bacteria, corrosion deposits, contaminants, general sludge and debris Temperature – 20ºC to 45ºC Habitat – scale, tanks, dead legs, stagnant water areas, biofilm
  6. 6. LEGIONNAIRES DISEASE Approximately 40 species of legionella bacteria exist. Legionella Pneumophila Serogroup 1 is most commonly causes 82% of all known cases of legionellosis. 12% of reported cases are fatal. Incubation takes 2-10 days Most at risk are males aged 45 who are alcoholics and smoke and have diabetes, cancer and chronic respiratory or kidney disease. i.e. the immunosuppressed.
  7. 7. HIGH RISK WATER SYSTEMS Cooling towers / evaporative condensers Basket washers / tub washes Bread coolers Pressure washers Hot and cold water domestic systems Lorry washers Splitters / sprayers
  8. 8. COOLING TOWERS/CONDENSERS
  9. 9. BASKET WASHERS
  10. 10. BREADCOOLERS
  11. 11. HOT AND COLD DOMESTICS
  12. 12. Written scheme Details all required tests, actions, monitoring required to minimise the growth and dissemination of legionella bacteria Defines what tests are to be done, by whom and at what frequency.
  13. 13. TYPICAL WRITTEN SCHEME - DAILY Check systems are operating correctly Check water treatment chemicals are stocked and dosing Report any unusual conditions immediately All of the above must be logged
  14. 14. WEEKLY CHECKS Flush little used outlets, dead legs etc. Test cooling towers Test breadcoolers Test basket washers Clean breadcoolers, basket washers, splitters, tub washers etc.
  15. 15. DIP SLIDE RESULTS
  16. 16. TOWER TESTS - WEEKLY Conductivity pH Free Halogen TVC 1000-2000 6.5 - 9.0 0.5 - 3.0 <105
  17. 17. BREAD COOLER TESTS - WEEKLY Conductivity / concentration factor to demonstrate chemical retention time pH to ensure correct environment for chemical activity Visual inspections for breadcrumb, mould etc. Dip slide for TVC and mould Chemical tests where applicable.
  18. 18. BASKET / TRAY / RACK WASHERS - WEEKLY Temperature in wash & rinse sections pH for chemical in wash tank Checks on pumps, drains, air blowers, tanks etc.
  19. 19. MONTHLY Temperatures Full Water analysis of towers, breadcoolers, lorry washes etc by water treatment service provider Bacterial analysis of varied water systems and random sample points. Legionella tests of systems that are out of specification and a cause for concern
  20. 20. QUARTERLY Legionella sampling of cooling towers Descale and sterilisation of showerheads and spray nozzles Bacterial analysis of incoming water supplies to key water systems like cooling towers. Formal review of water treatment records, results, checks and any corrective actions
  21. 21. Bi-ANNUAL Sterilisation of softener resin beds Cooling tower cleans Full chemical deep cleans of breadcoolers Temperature of incoming water supplies to water storage tanks and buildings.
  22. 22. YEARLY Inspection of water storage tanks Blowdown and inspection of hot water calorifiers Review of written scheme, training records, lines of communication Re-issue of code of conduct, contractors safe at work cert, risk assessments and method statements for activities on site
  23. 23. TWO YEARLY Review of risk assessment. This is not limited to every 2 years. If any changes to a system occur, a review of the risk to that system must be completed immediately.
  24. 24. FOR FURTHER INFORMATION Contact AKVO Ltd Tel 0844 244 8726 Or visit www.akvo.co.uk

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