Chemistry 2210A/B Lecture 9: Purification of Drinking Water

• School: Western University
• Department: Chemistry
• Course: Chemistry 2210A/B
• Professor: Keith Griffiths

Document Summary

Aeration is bubbling of air through water. Get water being aerobic oxygen content in water = high. Displacement of gases that we don"t want. Water can only contain so much gas. Decreases the odour of the water, since h2s and reduced organic-sulfur compounds are removed (transferred into air bubbles) The oxygen in air oxidizes the most easily oxidized organic materials; co2 is produced. Organics can be removed using activated carbon (expensive) If contain organic contaminants, after aeration, passing the water through activated carbon filter. Dissolved fe2+ is oxidized to fe3+, which then precipitates as fe(oh)3. Elemental carbon made of wood product that is heated in absence of oxygen to remove gases in the wood use a lot of heat. Is a high-carbon-content natural material such as peat, wood or lignite. Charred at temperatures below 600 c, then oxidized using co2 or steam: end up with carbon with a large surface area.