Municipal wastewater treatment
The contamination of groundwater and rivers with untreated wastewater from residential, commercial, and industrial areas can be environmentally harmful in many ways. Microorganisms can spread disease; the decomposition of organic materials can cause oxygen depletion in rivers, lakes, leading to the release of foul-smelling gases. Toxic substances in wastewater can accumulate in living organisms; and the nutrients in wastewater also worsen eutrophication.
The long-term effects of such pollution are also
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