GGR100H1 Chapter Notes -Aeration, Secondary Treatment, Sewage Treatment
Document Summary
Sewer systems to collect wastewater in 19th century: Cso combined sewage overflow temporary direct discharge of untreated water. Cso most frequently occur when city has combined sewer system that collects wastewater, sanitary wastewater and storm water runoff in various pipes, which then flows into single treatment facility. During dry weather, wastewater directly into sewage treatment. During rain, volume of water exceeds, rainwater is not directed separately anymore and mingles with household waste and industrial wastes. Sss sanitary sewer system built in cites in 20th century have separate popes that collect sewage and storm water separately. But when rains, excess storm water can overload system, so storm water is discharged directly untreated concentrations increased sewage plants like algae, source of damaging pollutants, beach closures and shellfish decline. Pollutants from cso and sss discharge include nutrients (stimulate growth of algae); deplete dissolved oxygen in water, bacteria and other pathogens (impair drinking water, recreational resources) metals and toxic chemicals.
