Denitrification with corncob as carbon source and biofilm carriers

In this research the agricultural by-product corncob was investigated as a carbon source as well as a biofilm carrier to remove organic matter, expressed as chemical oxygen demand (COD) and nitrate nitrogen (nitrate-N), from wastewater in a batch laboratory reactor. The performance of a reactor with...

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Bibliographic Details
Published in:Water science and technology 2012-01, Vol.65 (7), p.1238-1243
Main Authors: Li, Guochao, Chen, Jie, Yang, Tao, Sun, Jianqi, Yu, Shenglu
Format: Article
Language:English
Subjects:
Agricultural research
Batch reactors
Biofilms
Biological Oxygen Demand Analysis
Bioreactors
Carbon
Carbon - metabolism
Carbon sources
Chemical oxygen demand
Denitrification
Feasibility studies
Glucose
Limiting factors
Nitrates
Nitrates - isolation & purification
Nitrogen
Organic matter
Reaction time
Reactors
Removal
Wastewater
Zea mays
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Summary:In this research the agricultural by-product corncob was investigated as a carbon source as well as a biofilm carrier to remove organic matter, expressed as chemical oxygen demand (COD) and nitrate nitrogen (nitrate-N), from wastewater in a batch laboratory reactor. The performance of a reactor with corncob as the carbon source and the biofilm carrier was compared with a control batch reactor with suspended plastic carriers and glucose as the sole carbon source. With 60 vol% of corncob carriers inside the reactor, a soluble COD/N ratio of 4.2 g COD g N(-1) was enough for total denitrification, nearly half of the control reactor (9.5 g COD g N(-1)), at 23 h reaction time. The specific denitrification rate decreased with increasing soluble COD consumption for both reactors. Nitrate and COD removal efficiencies decreased with shorter retention times, with accentuated effects in the reactor. This study suggested corncob as a feasible carbon source and that reaction time was a limiting factor with corncob used as the carbon source for denitrification.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2012.960