Development of a response surface for prediction of nitrate removal in sulfur-limestone autotrophic denitrification fixed-bed reactors

Tian C. Zhang, Hui Zeng

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Sulfur-limestone autotrophic denitrification (SLAD) processes are very efficient for treatment of ground or surface water contaminated with nitrate. However, detailed information is not available on the interaction among some major variables on the design and performance of the SLAD process. In this study, the response surface method was used by designing a rotatable central composite test scheme with 12 SLAD column tests. A polynomial linear regression model was set up to quantitatively describe the relationship of the effluent and influent nitrate-nitrogen concentration and hydraulic retention time (HRT) in the SLAD column reactors. This model may be used for estimating the effluent nitrate-nitrogen concentration when the influent nitrate-nitrogen concentration ranges between 20 and 110mg/L and the HRT ranges between 2 and 9h. Based on our model and the requirement for nitrite control, we recommend that the HRT of the SLAD column reactor be kept ≥ 6 h and the nitrate loading rate less than 200 g NO3--N/ day m3 media to achieve high nitrate removal efficiency (>99%) and prevent nitrite accumulation from being >1mg/L NO2--N.

Original languageEnglish (US)
Pages (from-to)1068-1072
Number of pages5
JournalJournal of Environmental Engineering
Volume132
Issue number9
DOIs
StatePublished - Sep 1 2006

Fingerprint

Calcium Carbonate
Denitrification
Limestone
Sulfur
Nitrates
denitrification
sulfur
limestone
nitrate
prediction
Nitrogen
Hydraulics
Nitrites
hydraulics
nitrite
Effluents
nitrogen
effluent
Surface waters
Linear regression

Keywords

  • Abatement and removal
  • Biofilm
  • Denitrification
  • Kinetics
  • Nitrates
  • Predictions
  • Reactors

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering
  • Environmental Chemistry
  • Environmental Science(all)

Cite this

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abstract = "Sulfur-limestone autotrophic denitrification (SLAD) processes are very efficient for treatment of ground or surface water contaminated with nitrate. However, detailed information is not available on the interaction among some major variables on the design and performance of the SLAD process. In this study, the response surface method was used by designing a rotatable central composite test scheme with 12 SLAD column tests. A polynomial linear regression model was set up to quantitatively describe the relationship of the effluent and influent nitrate-nitrogen concentration and hydraulic retention time (HRT) in the SLAD column reactors. This model may be used for estimating the effluent nitrate-nitrogen concentration when the influent nitrate-nitrogen concentration ranges between 20 and 110mg/L and the HRT ranges between 2 and 9h. Based on our model and the requirement for nitrite control, we recommend that the HRT of the SLAD column reactor be kept ≥ 6 h and the nitrate loading rate less than 200 g NO3--N/ day m3 media to achieve high nitrate removal efficiency (>99{\%}) and prevent nitrite accumulation from being >1mg/L NO2--N.",
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AB - Sulfur-limestone autotrophic denitrification (SLAD) processes are very efficient for treatment of ground or surface water contaminated with nitrate. However, detailed information is not available on the interaction among some major variables on the design and performance of the SLAD process. In this study, the response surface method was used by designing a rotatable central composite test scheme with 12 SLAD column tests. A polynomial linear regression model was set up to quantitatively describe the relationship of the effluent and influent nitrate-nitrogen concentration and hydraulic retention time (HRT) in the SLAD column reactors. This model may be used for estimating the effluent nitrate-nitrogen concentration when the influent nitrate-nitrogen concentration ranges between 20 and 110mg/L and the HRT ranges between 2 and 9h. Based on our model and the requirement for nitrite control, we recommend that the HRT of the SLAD column reactor be kept ≥ 6 h and the nitrate loading rate less than 200 g NO3--N/ day m3 media to achieve high nitrate removal efficiency (>99%) and prevent nitrite accumulation from being >1mg/L NO2--N.

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