Nitrification in a Salt Wedge Estuary

by Walter T. Trial, Jr., Parametrix Inc, Bellevue, WA, USA,

Document Type: Proceeding Paper

Part of: Coastal Zone '87


Autotrophic nitrifying bacterial activity and numbers were measured in a salt wedge estuary receiving ammonium-rich effluent from a municipal secondary wastewater treatment facility. Instream nitrification was observed to be primarily a benthic rather than planktonic process. The observed instream rate of nitrification below the effluent outfall was 725 mg m** minus **2 day** minus **1 at a temperature of 18. 6 degree C. Sediments located in an area of salt wedge influence exhibited a 7-fold reduction in potential nitrifying activity over upstream, freshwater sediments.

Subject Headings: Water treatment plants | Estuaries | Salts | Salt water | Bacteria | Effluents | Sediment | Ammonia

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