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530:{{Information |Description={{en|1=View of a {{w|nitrification}} process tank at a sewage treatment plant.}} |Source=U.S. Environmental Protection Agency (EPA), EPA 832-R-04-001. p. 18. |Date=September 2004 |Author=U.S. Environmental Protection Agency, Washington, D.C. |other_versions= }} =={{int:license-header}}== {{PD-USGov-EPA}}
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U.S. Environmental
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