Fate of nitrogen in land application systems

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Land application of wastewater has been considered as one of the processes that can be used to reduce the pressure on fresh water resources for irrigation use. Over ten years of research on the conversion, movement, and utilization of the various forms of nitrogen applied to land application systems is presented as it relates to the system design based upon the water, nutrient, and salt balance processes. This research modeled the quality and quantity of leachate water passing through root zone. Deep percolate water was collected in lysimeter type samplers and analyzed for quality constituents. The data shows that the total nitrogen concentration in the leachate is less than 5 mg/L and typically less than 2 mg/L. Salt concentration varies with designed leaching ranging from 1100 to 2500 μS/cm. The variance of soil TKN was investigated within three types of soils at two different depth ranges over a 12-month period while the denitrification rate was measured within three soils in three different months of that period and in the lab. This research confirmed that the denitrification process prefers higher temperatures and soil moisture levels above 10%. Soil moisture content was found to be the prerequisite condition for high denitrification. In addition, there was no significant difference (p<0.05) in the TKN in the soil at the two depths of 0 to 15 cm (0 to 6 in) and 46 to 61 cm (18 to 24 in) in the mass-balanced designed and operated system.

Original languageEnglish
Title of host publication2016 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2016
PublisherAmerican Society of Agricultural and Biological Engineers
ISBN (Electronic)9781510828759
DOIs
StatePublished - 2016
Event2016 ASABE Annual International Meeting - Orlando, United States
Duration: Jul 17 2016Jul 20 2016

Publication series

Name2016 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2016

Conference

Conference2016 ASABE Annual International Meeting
CountryUnited States
CityOrlando
Period07/17/1607/20/16

Keywords

  • Nitrogen
  • Sustainable water
  • Wastewater
  • Wastewater irrigation
  • Water reuse

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