Performance of a constructed wetland with a sulfur/limestone denitrification section for wastewater nitrogen removal

Achintya N. Bezbaruah, Tian C. Zhang

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

The effectiveness of a nonvegetated lab-scale subsurface flow constructed wetland for wastewater treatment had been evaluated with the feed ammonium concentration of ∼20-40 mg of NH4+-N L-1 and a hydraulic retention time of ∼ 10 d. The present system had a nitrification zone plus a sulfur/limestone (S/L) autotrophic denitrification zone followed by an anaerobic polishing zone and was operated with and without aeration. The wetland had only 80% organics removal and no net nitrogen removal when there was no artificial aeration. However, almost 100% organics removal and ∼81 -90% total inorganic nitrogen (TIN = NH4+-N + NO2-N + NO3--N) removal were achieved when the oxic zone of the system was aerated with compressed air. S/L autotrophic denitrification contributed 21-49% of total NO3--N removal across the whole wetland and 50-95% across the S/L column. TIN and NH4+-N in the effluent were always <5.5 and < 0.7 mg L-1, respectively, when the feed had NH4+-N ≤ 35 mg L-1. Sulfate removal of ∼53-69% was achieved in the anaerobic polishing zone. The position of the S/L column was changed (1.78, 2.24, and 2.69 m from the inlet), and no remarkable difference in nitrogen removal was observed. However, without the S/L column, TIN removal decreased to ∼74%, and the effluent NO3-N increased about two times (9.13 mg of N L-1). The present study has demonstrated the possible use of S/L autotrophic denitrification for nitrate removal in a constructed wetland.

Original languageEnglish (US)
Pages (from-to)1690-1697
Number of pages8
JournalEnvironmental Science and Technology
Volume37
Issue number8
DOIs
StatePublished - Apr 15 2003

Fingerprint

Nitrogen removal
Calcium Carbonate
Denitrification
Wetlands
constructed wetland
Sulfur
denitrification
Wastewater
sulfur
limestone
wastewater
nitrogen
Polishing
Effluents
aeration
Nitrification
wetland
Compressed air
effluent
removal

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Performance of a constructed wetland with a sulfur/limestone denitrification section for wastewater nitrogen removal. / Bezbaruah, Achintya N.; Zhang, Tian C.

In: Environmental Science and Technology, Vol. 37, No. 8, 15.04.2003, p. 1690-1697.

Research output: Contribution to journalArticle

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