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Encyclopedia > Raw sewage

Raw sewage is any untreated waste water from a city. It will invariably contain human wastes as well as everything else that goes down the drain, such as detergents and soaps, condoms, etc. Raw sewage was commonly released directly into oceon in the past but this practice is strongly discourged due to its severe negative envronmental consequence.

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  Results from FactBites:
 
NRDC: Sewage Pollution Threatens Public Health (830 words)
Untreated sewage carries a dangerous cargo of infectious bacteria, viruses, parasites and toxic chemicals.
Raw sewage is supposed to be carried to wastewater treatment plants for processing.
Yet our sewage collection systems -- 200 years old in places -- are plagued by broken, leaking or overloaded pipes that allow untreated sewage to be released directly into the environment on a routine basis.
Sewage Treatment (726 words)
The goal of sewage treatment systems is to reduce the concentrations of organic pollutants in raw sewage such that the clarified waste can be discharged into natural bodies of water without disrupting the ecosystem.
The sewage is continually circulated through trickle filters housed in "biotowers" or "activated growth units" where redwood slats are stacked and act as substrates for the attachment and growth of layers of aerobic, heterotrophic microorganisms.
The liquid sewage is sprayed over the slats to enhance aerobic conditions, and the organic compounds are broken down as the sewage trickles past the microbes growing on the slats.
  More results at FactBites »


 

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