Viewing entries posted in October 2014

New Research Highlights the Role of Freshwater Mussels in Nitrate Formation

Posted by Craig Just on 1 October 2014 | 0 Comments

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Native freshwater mussels can influence the aquatic N cycle, but the mechanisms and magnitude of this effect are not fully understood. We assessed the effects of Amblema plicata and Lampsilis cardium on N transformations over 72 d in 4 continuous-flow mesocosms, with 2 replicates of 2 treatments (mesocosms with and without mussels), equipped with electronic water-chemistry sensors. We compared sensor data to discrete sample data to assess the effect of additional sensor measurements on the ability to detect mussel-related effects on NO3 formation.  Link to full article.

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Nitrogen Removal from Wastewater by an Aerated Subsurface-Flow Constructed Wetland in Cold Climates

Posted by Craig Just on 1 October 2014 | 0 Comments

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The objective of this study was to assess the role of cyclic aeration, vegetation, and temperature on nitrogen removal by subsurface-flow engineered wetlands. Aeration was shown to enhance total nitrogen and ammonia removal and to enhance removal of carbonaceous biochemical oxygen demand, chemical oxygen demand, and phosphorus. Effluent ammonia and total nitrogen concentrations were significantly lower in aerated wetland cells when compared with unaerated cells.  Link to full article.

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