What are we learning today How to clean a water storage tank How to disinfect a water storage tank and distribution network Questions to think about What is in these tubes Bacteria algae sand etc ID: 1027216
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1. Cleaning and Disinfection of Water Storage Tank and Distribution Network
2. What are we learning today? How to clean a water storage tankHow to disinfect a water storage tank and distribution network
3. Questions to think about: What is in these tubes?Bacteria, algae, sand, etc. What do bacteria and dirt do?Dirty the waterWhy is it necessary to clean and disinfect the tank and the distribution network? To remove the soil and bacteria from the system so we are providing potable drinking water
4. VideoYouTube video on disinfection guide for a small community water system (concrete water reservoir)YouTube video on disinfection guide for a small community water system (plastic water reservoir)
5. Let’s practice!Match the drawing to the correct water system disinfection step
6. Two Days Before3-6 people3 or more brushes3 or more protective masksRubber bootsHand scale Machete65%-75% powdered chlorine Tablespoon3 or more protective glasses3 or more rubber glovesMixing stick3 bucketsLadder2 or more brooms Advise the water system users that they should not use the disinfection water and they will not have water for 2 days Make sure you have all the necessary materials:
7. The Night BeforeThe night before the tank is cleaned, turn off the pump or cut off the water at the tank entrance, allowing the community to use the water to drain the tank.
8. Day 1The day of the cleaning, confirm the community has been notified.
9. Day 1: External Cleaning (every 3 months)Clean the rocks, undergrowth and dirt from the zone around the tank, including the tank cleanout line or drainage canal.
10. Day 1: External Cleaning (every 3 months)Remove the sanitary lid of the water storage tank and close the water storage tank inflow and outflow (to distribution network) valves.Remove the water in the water storage tank by opening the washout valve.Clean out the dirt and/or water in the valve box and check the valves for breaks or leaks.*Every system is differentCleanout valveExit valveBypass valveEntrance valve
11. Day 1: Internal Cleaning (every 3 months) Using a clean broom, remove the dirt from the floor of the water storage tank.Clean the interior water storage tank walls and accessories with the brooms and brushes. Throw out the dirty water.
12. Day 1: Tank Disinfection (every 3 months) Always use the proper protective equipment when working with chlorine powder or chlorine solution: Protective MaskRubber BootsProtective GlassesRubber Gloves
13. Day 1: Tank Disinfection (every 3 months) Using the powdered chlorine, dissolve 4 tablespoons of powder chlorine in a 20L bucket. More than one bucket of chlorine solution can be prepared if necessary. Chlorine
14. Day 1: Tank Disinfection (every 3 months) With this solution and a brush, scrub the walls, floor, roof, sanitary lid and accessories in the water storage tank. Take turns with who is inside the tank. Do not stay in the tank for a prolonged period of time (maximum 10 minutes), since the chlorine produces toxins and can cause suffocation. Using the buckets, rinse the walls of the tank with fresh water to remove the chlorine.
15. Day 1: Tank Disinfection (every 3 months) Refill the tank during the night and the next morning. The time it takes to fill the tank is different for each system.
16. Day 2: Tank Disinfection (every 3 months) When the water level in the tank is halfway, prepare the chlorine solution using the appropriate quantity.Volume of water storage tank:____Mix in parts (0.5 kg or 1 lb at a time) using a 20 L bucket. Carefully add the solution to the tank little by little.
17. Day 2: Tank Disinfection (every 3 months) Finish filling the storage tank with water and leave the solution for 2 hours. 2 hours
18. Day 2: Tank Disinfection/Distribution Network Disinfection If you are not going to disinfect the distribution network: After 2 hours, empty the water storage tank by opening the clean out valve. If you are going to disinfect the distribution network (every 6 months):After 2 hours, open the outflow valve to the water distribution network, simultaneously, open faucets in all houses and have each household remove 10 buckets of water. Then close the faucets and place a plastic bag over them to ensure no one drinks the disinfection water
19. Day 2: Distribution Network Disinfection (every 6 months) Let the chlorinated water sit in the distribution network for 4 hours. After 4 hours, remove the chlorinated water from the water storage tank and distribution system by opening all household/tap stand valves.Have each household keep their faucets open until no water comes out. Refill the storage tank with water and continue with normal water service
20. What did we learn? Why is it necessary to clean and disinfect the storage tank and distribution network?To ensure potable water is reaching the households. What do you need to do before cleaning and disinfecting?Inform the community, make sure you have all of the materials. How often (months) do you need to clean the storage tank? Disinfect the storage tank? Disinfect the distribution network?Water storage tank cleaning and disinfection is every 3 months, water distribution network disinfection is every 6 months.
21. What did we learn? At least, how many people do you need to clean and disinfect the storage tank?At least 3 peopleWhat equipment is required to perform the cleaning and disinfection?Hand scale, mixing stick, ladder, 3 or more rubber gloves, 3 or more protective masks, 2 or more brooms, 65%-75% powdered chlorine, 3 or more protective glasses, 3 or more brushes, 3 buckets, boots, machete, soup spoon
22. Thank You!