Drinking Water Treatment by Media filtration and disinfection
Drinking water sources are subject to contamination and require appropriate treatment to remove disease-causing agents. Public drinking water systems use various methods of water treatment to provide safe drinking water for their communities. Today, the most common steps in water treatment used in municipal water systems (mainly surface water treatment) include: Coagulation and Flocculation - Coagulation and flocculation are often the first steps in water treatment. Chemicals with a positive charge are added to the water. The positive charge of these chemicals neutralizes the negative charge of dirt and other dissolved particles in the water. When this occurs, the particles bind with the chemicals and form larger particles, called floc. Sedimentation - During sedimentation, floc settles to the bottom of the water supply, due to its weight. This settling process is called sedimentation. Filtration - Once the floc has settled to the bottom of the water supply, the clear water on top will pass through filters of varying compositions (sand, gravel, and activated carbon) and pore sizes, in order to remove suspended solid particles, such as dust, organic and nonorganic matter. Disinfection - After the water has been filtered, a disinfectant (for example, chlorine, chloramine) may be added in order to kill any remaining parasites, bacteria, and viruses, and to protect the water from germs when it is piped to homes and businesses. Yamit designs and supplies complete drinking water systems and plants for very small to medium size (villages and small towns) manufactured and assembled in containers or on skids in house and on site from pre-fabricated components.