What are your opinions about chemical cleaning of water tanks compared to plain old disinfecting?
asked 7 March 2016 asked by Amy (2850 points)
Hi, The primary goal of cleaning and disinfecting drinking water is to remove anything likely to alter the microbiological quality of supplied water. Cleaning allows for the elimination of deposits on the walls (iron oxide, manganese or even lime scale) as well as the removal of sludge deposited at the bottom of the tank. This step is essential to the success of the final disinfection. Disinfection is a comprehensive step in its own right and should be a separate consideration from any cleaning you do. It is undertaken last.
Hi, We have subcontracted this operation for many years, but I'll give you a few details to think about in terms of your needs. Let's start with training and equipment. You'll need a team with confined spaces certification and trained in the use of chemicals. Operators need to have dedicated safety equipment: Harness, lanyard, fall-arrest devices Extractor fan for work where natural ventilation is limited Helmets with waterproof headlamps Air-purifying respirator with filter Rubber gloves and rubber safety boots, Personal protective clothing Gas detector (confined space) Container to disinfect the PPE; also make sure to disinfect footwear before entering the area Do not use any bleach-based products because of the risk of a reaction with the cleaning solution in the tank. Operating equipment: Pump for the spraying of your chosen cleaning product Portable lighting for work area (rechargeable LED) Vacuum pump (if needed) Dosing pump to neutralize rinse water: adjust discharge pH with a neutralizer until it is between 6.5 and 9. Broom Rope, etc. Make sure the lighting in the cleaning area is waterproof and protected with a residual current device.