Water Treatment Plant

On Thursday the 12th of November half of grade six went to a water treatment plant. The reason is because grade six is learning about water and how people go through the process on how to clean so it becomes clean enough to drink and do everything else with. The water treatment plant we went to is somewhere near to Anchol. While all the math and science teachers went to the water treatment plant the other half of sixth grade went to Bintaro Lama.
Step 1, Garbage Removal: At this stage they let the water from the river come in. First they let the water through a big filter to take out all the bulk in the water and send it to a place where the recycle the garbage to make other things such as bricks. After all the bulk is gone they send it to a smaller filter to take out most of the smaller pieces of the pollution in the water. At the plant they have to clean the filters every hour because the river is polluted really badly.
Step 2, Alum Added: At this stage they bring the water all the way to the back of the plant to put in a chemical that causes all the tiny dirt particles to come together and from floc. This chemical is added and then they stir the water causing all the dirt to come to the top and sick together. This takes long before the water is moved to the stage of cleaning water.
Step 3, Allow The Sediment To Settle: At this stage the alum has been added and now the floc is settling to the bottom so they can scoop up all the dirt from the bottom instead of skimming it from the top, this is called sedimentation. Once they have scooped the sediment from the bottom the water is sent to the very back of the plate. This stage might take a long time before they can move the water on to the next stage.
Step 4, Filtering The Water Through A Sand Filter: After the water has been cleaned some really tiny dirt particles still are in the water and this can cause very bad diseases. In this stage water is filtered through 1metre of sand and then sent to another tank. The sand that they use is very unique because all the sand grains are the same size because otherwise the rest of the tiny dirt particles can go through smaller grains of sand.
Step 5, Disinfecting To Make Potable: At this stage chemicals are added to the water to make the water clean and potable. They add many chemicals to make the water cleaner and able to send it to reservoir and the water is very clean after it has been through the whole process on making extreme dirty water to clean water.
We were done and now heading back to JIS, when Yash and I realized that the river where the water treatment plate used is the same river that is in front of our apartment building. I found it amazing and wanted to know other ways on how to clean water in other countries and how they use it.