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Sewage treatment plant | by eutrophication&hypoxia
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Sewage treatment plant

Though most developed countries treat sewage, treatment levels do not generally remove nutrients from the wastewater that is discharged. One exception is the state of Maryland (U.S.) where all major sewage treatment plants are required to upgrade to enhanced nutrient removal technologies that will remove most of the nutrients from the wastewater.

Photo Credit: Chesapeake Bay Program

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Taken on April 12, 2010