water waste treatment
Storyboard Text
- at waste water treatment factory
- Hey Stop
- yeah sure
- I was thinking to tell people about our work at waste water treatment factory
- inside the factory
- How do you know about that
- we will need more people for it
- I know they are going to tell people about our work
- (hehe I heard there conversation)
- what are you both talking about
- now let me go to work
- at the bottle keeping place
- First we have filteration in which The wastewater is passed through bar screen. Large objects, like rags, sticks, plastic bags, cans, etc. are removed in this process
- then we have grit and sand removal in which The wastewater is slowly passed through the sedimentation tank. Grit, sand and pebbles settle down at the bottom.
- next we have sedimentation - Water is then sent to the sedimentation tank. Solids, like faeces settle at the bottom. Floatable impurities, like oil and grease float on the surface. A scraper removes the faeces from the water. The impurity thus collected is called sludge, which is sent to the sludge tank. The sludge can be used to produce biogas or to produce manure. A skimmer removes the floatable impurities. Now, the water is called clarified water.
- afterwhile....
- after that - Aeration: Air is pumped into clarified water so that bacteria can proliferate. Bacteria consume the human waste. It leaves food waste, soap and other unwanted materials in the water. The microbes settle down at the bottom after several hours. Water is then removed from the top. This water is fit for irrigation and can be used for that purpose.
- now its time to go home
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