Sewage treatment - Wikipedia, the free encyclopedia
"...
Sewage treatment is the process of removing
contaminants from
wastewater, including household
sewage and
runoff (
effluents). It includes physical, chemical, and biological processes to remove physical, chemical and biological contaminants. Its objective is to produce an environmentally safe fluid waste stream (or treated
effluent) and a solid waste (or treated
sludge) suitable for disposal..."
Sewage treatment
"There are significant advantages to sewage treatment accruing both to humans and the natural environment. With regard to people, the most significant benefit is a major decrease in incidence of waterborne disease, since most effluent streams have the potential to enter drinking water supplies as well as dermal contact. Pathogens in untreated wastewater include
bacteria, viruses and
protozoa; helminthes (intestinal worms and worm-like parasites);"
Introduction | Sewage Sludge (Biosolids) | US EPA
"Thirty years ago, thousands of American cities dumped their raw sewage directly into our nation's rivers, lakes, and bays. Today, because of improved wastewater treatment, our waterways have been cleaned up and made safer for recreation and seafood harvest. And, because of the strict Federal and state standards, the treated residuals from wastewater treatment (biosolids) can be safely recycled. Local governments make the decision whether to recycle the biosolids as a fertilizer, incinerate it or bury it in a landfill."
Stickney Water Reclamation Plant, Chicago. Capacity: 1.44 billion gallons per day.
Deer Island Sewage Treatment Plant — Boston, USA. Capacity: 1.27 billion gallons per day.