Water Purification and Sewage (Wastewater) Management
Maharashtra Board · Class 10 · Water Security
Quick revision notes for Water Purification and Sewage (Wastewater) Management — Maharashtra Board Class 10 Water Security. Key concepts, formulas, and definitions for last-minute revision.
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Key Topics to Revise
1. Turbidity of Water and Its Measurement
- Turbidity of water is the reduction in clarity, transparency, and quality of water due to suspended soil and soluble substances.
- It is misconception that turbid rainwater is waste.
- Turbid water can be kept stagnant for some time, or the right amount of alum can be added to reduce turbidity.
2. Stages of Water Purification
- The stages of water purification are pumping, air mixing, coagulation, flocculation, sedimentation, sand filtration, and disinfection.
- Pumping brings water from the source to the purification plant.
- Wire mesh is installed at the pumping stage to prevent fishes and small plants from coming out of the tap while pumping.
3. Disinfection Agents
- Chlorine is a common disinfecting gas used to kill germs in water.
- Chlorine is convenient and safe to mix in water.
- Chlorine kills germs by forming hypochlorus acid.
4. Domestic Water Purification Devices
- UV water purifier uses three-stage filtration.
- In the first stage, activated carbon removes dust, fine sand, or waste material.
- Nano silver coated carbon filters remove unwanted taste and odour.
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