Accession Number : ADA259840


Title :   Sequential Nitrification/Denitrification in Subsurface Flow Constructed Wetlands. A Literature Review


Descriptive Note : Master's thesis


Corporate Author : TEXAS UNIV AT AUSTIN DEPT OF ENGINEERING


Personal Author(s) : Titus, Frank W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259840.pdf


Report Date : Dec 1992


Pagination or Media Count : 83


Abstract : Even though there is currently no consensus on the design of subsurface flow constructed wetlands, the ability of constructed wetlands to meet municipal wastewater requirements is well documented. Nitrogen removal appears from the existing performance data to be one of the primary problems with these systems. The negative effects of excessive levels of nitrogen on the aquatic environment include eutrophication of receiving waters and the increased risk of methemoglobinemia in human infants where elevated levels of nitrate (NO3-) or nitrite (NO2-) nitrogen are present in drinking water supplies. The performance of constructed wetlands for nitrogen removal, at best, can be rated poor to fair. As a result of the negative effects of excessive nitrogen on the environment and the problems with constructed wetlands in consistently removing nitrogen to within acceptable levels, this report will be directed towards the sequential nitrification/denitrification process.


Descriptors :   *WETLANDS , *SUBSURFACE , *NITRIFICATION , COMMUNITIES , WASTE WATER , THESES , FLOW


Subject Categories : Agricultural Chemistry
      Agricultural Engineering
      Inorganic Chemistry
      Water Pollution and Control
      Environmental Health and Safety


Distribution Statement : APPROVED FOR PUBLIC RELEASE