https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:aquatic-and-terrestrial-pollution/x0b0e430a38ebd23f:waste-disposal-reduction-and-treatment/v/ap-es-sewage-treatment 2024-06-21T23:15:14.703721694Z Sewage treatment The process of waste disposal, reduction, and treatment involves primary, secondary, and sometimes tertiary treatments. Primary treatment physically removes large objects, while secondary treatment uses aerobic bacteria to break down organic waste. Tertiary treatment, though not always used due to cost, targets specific wastewater components for removal. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/09af1cda-eb97-461f-8326-3c1946c6a972_1280_720_base.png Sewage treatment The process of waste disposal, reduction, and treatment involves primary, secondary, and sometimes tertiary treatments. Primary treatment physically removes large objects, while secondary treatment uses aerobic bacteria to break down organic waste. Tertiary treatment, though not always used due to cost, targets specific wastewater components for removal. https://cdn.kastatic.org/ka-youtube-converted/_a8Mbkt_o80.mp4/_a8Mbkt_o80.mp4 293 Organic Impurities https://www.khanacademy.org/science/kn-class-7-science/x2edacdad2354c760:wastewater-story/x2edacdad2354c760:journey-of-wastewater-sewage/e/journey-of-wastewater 2026-04-07T22:23:57.656416987Z Journey of wastewater Explore how wastewater travels from homes to treatment plants through manholes, sewers, and screening systems. This exercise explains sewage composition, the function of manholes and sewerage routes, and the key steps of wastewater treatment - including bar screening, grit removal, sedimentation, aeration, and sludge handling - while highlighting how each stage helps clean and recycle used water. Yajurva Joshi exercise