City water either comes from nearby bodies of water or from underground aquifers. it is prosseced in water treatment plants where it removes harmful bacteria so that we are able to drink the water when its been cleaned.
Sewage can be treated close to where it is created in places such as biofilters or septic tanks or collected and transported by large networks of pipes to a municipal treatment plant. Industrial sources of wastewater often require specialized treatment processes.
http://en.wikipedia.org/wiki/Sewage_treatment
how is the sewer water filtered?
how long does it take to filter the sewer water?
Footprint Blog
13 years ago
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