7. WATER TOO LITTLE TO WASTE
- We are not aware of the need to preserve fresh water.
- Water resources are not being increased along with population and their needs. Sewage is liquid waste.
- The impurities in water are called contaminants.
- Nitrates, Phosphates, metals... etc are the inorganic impurities in water.
- Air is pumped into clorified water to help aerobic bacteria to grow.
- Aeration causes organism that break down waste to grow faster thus it leads to what is called as 'Biological process'.
- We can conserve water by adopting certain good practices.
- Only one per cent of all water resources is available fresh water.
- The available resource of fresh water is getting depleted at a very fast pace due to different human activities.
- Waste water is generated at homes, industries, etc., by different human activities.
- All the waste water released by homes, industries, hospitals, offices and other users are collectively called Sewage.
- Sewage is a liquid waste. Most of it is water, which has dissolved and suspended impurities, disease causing bacteria and other microbes.
- Sewage water contains inorganic, organic and bacterial as well as other microbial contaminants.
- Waste water is treated in treatment plants.
- Physical, chemical and biological processes are involved in treatment of waste water at the treatment plants.
- Chlorine kills harmful disease causing organisms present in waste water.
- Aeration allows growth of microbes that break down wastes.
- Different types of drainage systems are open, closed and underground ones.
- Septic tanks also help in waste water disposal.
- Water should be treated before being released to water bodies.
- Water must be conserved by individual efforts as well as through efforts made by the community.