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 The purification of water means making the unhealthy water potable. The purification of water involves following steps - Screening - The first step of purification of water is screening. In this step, the floating matter of large size present in the water is removed. Screening prevents the pumps and other equipments from the possible damage due to floating matter of sewage. Aeration - The process of exposing large surface of water to the atmospheric air is called aeration. After screening, water is collected in a large aeration tank and aerated by compressed air. This process removes volatile substances and gases like Hydrogen sulfide and carbon dioxide causing bad taste and odor. It increases the oxygen level in water. Due to aeration, precipitate of iron and magnese is formed which are separated from water. Sedimentation - The process by which suspended particles settle down under the action of gravity is known as sedimentation. Now, aerated water is placed in the sedimentati...

 Environmental engineering is application of science and engineering principles to make a healthy environment, to provide potable water, clean air and land to accommodate all creatures. It is the study of land, air, water, life and complex interactions between all. ENVIRONMENT     An environment is everything that is around us which includes both living and non-living things and their surroundings. It helps in feeding life on the earth. It involves land, air, water and life. Lithosphere   It indicates the soul body, it means earth. It is the hard & rigid outer layer of earth. It includes crust, core and mantle. Atmosphere   It is the layer of gases surrounding the earth. Nitrogen, Oxygen, Argon and Carbon-dioxide are major gases. Rest of gases are called trace gases. Hydrosphere It represents the water body present in our environment. All liquids & frozen surface water, ground water held in soil & rock, atmospheric water vapour. Biosphere   The ...