kjeldahl nitrogen analyzer Articles

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  Nitrogen source and rate influence on tall fescue quality and nitrate leaching in a southern California lawn

  In California, residential lawn area is second in planted acreage to production agriculture. Due to the demand for visually attractive lawns, relatively large amounts of N are often applied. The objective of this research was to investigate the effect of N source and application rate on tall fescue [Schedonorus phoenix (Scop.) Holub] visual quality and color, clipping yield, N uptake, and nitrate ...

  Jan. 1, 2010
  

  By Soil Science Society of America (SSSA)

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  A comparative study of an up-flow aerobic/anoxic sludge fixed film bioreactor and sequencing batch reactor with intermittent aeration in simultaneous nutrients (N, P) removal from synthetic wastewater

  The performance of two bench scale activated sludge reactors with two feeding regimes, continuous fed (an up-flow aerobic/anoxic sludge fixed film (UAASFF) bioreactor) and batch fed (sequencing batch reactor (SBR)) with intermittent aeration, were evaluated for simultaneous nutrients (N, P) removal. Three significant variables (retention/reaction time, chemical oxygen demand (COD): N ...

  May 12, 2017
  

  By IWA Publishing

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  French vertical-flow constructed wetlands in mountain areas: how do cold temperatures impact performances?

  The French version of vertical-flow constructed wetlands (VFCWs) is characterized by treating directly raw wastewater on a first-stage filter. VFCW is a well developed technology with more than 3,500 plants in operation in France. However, VFCW performance may be affected under the low temperatures reached in mountain areas during winter. The effect of cold conditions over 12 plants, ranging ...

  Apr. 27, 2015
  

  By IWA Publishing

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  Assessment of a rainwater harvesting system for pollutant mitigation at a commercial location in Raleigh, NC, USA

  Low Impact Development (LID) and Water Sensitive Urban Design have as one of their tenets the use of rainwater harvesting (RWH) systems to provide water for use on site. Historically implemented in arid or semi-arid regions, RWH has recently surged in popularity in more humid regions, such as the southeastern USA, due to increased interest in water conservation during severe drought conditions. ...

  Apr. 14, 2014
  

  By IWA Publishing

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  Treatment performances of French constructed wetlands: results from a database collected over the last 30 years

  Approximately 3,500 constructed wetlands (CWs) provide raw wastewater treatment in France for small communities (<5,000 people equivalent). Built during the past 30 years, most consist of two vertical flow constructed wetlands (VFCWs) in series (stages). Many configurations exist, with systems associated with horizontal flow filters or waste stabilization ponds, vertical flow with ...

  May 7, 2015
  

  By IWA Publishing