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Kinetics of cross-inhibited denitrification of a high load wastewater

Paper ID Volume ID Publish Year Pages File Format Full-Text
18258 42715 2007 8 PDF Available
Title
Kinetics of cross-inhibited denitrification of a high load wastewater
Abstract

Batch denitrification of a synthetic saline medium at 37 °C, pH 7.5 was studied. A kinetic expression and an inhibition function which adequately expresses inhibition and cross-inhibition by nitrate and nitrite in denitratation and denitritation steps occurring in high organic and nitrate load wastewater treatment was determined. Denitratation and denitritation rates were measured independently. Monod- and Haldane-type kinetics were used for denitratation and denitritation, respectively. The maximum specific rate, kNO3=12.7 mg NO3-N/g VSS hkNO3=12.7 mg NO3-N/g VSS h, and the saturation constant, KSNO3=0.47 mg NO3-N/LKSNO3=0.47 mg NO3-N/L were calculated for denitratation. The maximum specific rate, kNO2=13.8 mg NO2-N/g VSS hkNO2=13.8 mg NO2-N/g VSS h, the saturation constant KSNO2=0.36 mg NO2-N/LKSNO2=0.36 mg NO2-N/L and the inhibition constant KI-NO2=906 mg NO2-N/LKI-NO2=906 mg NO2-N/L were calculated for denitritation. Among other functional forms the Levenspiel inhibition model for denitratation and denitritation kinetics was proposed. The Levenspiel constants were SNO2-M=1149.4 mg NO2-N/LSNO2-M=1149.4 mg NO2-N/L, SNO3-M=34.7 mg NO3-N/LSNO3-M=34.7 mg NO3-N/L, β1 = 1.578 and β2 = 1.005, respectively. The fitted experimental values show a good representation of the denitrification of effluents with high nitrogen load containing both nitrate and nitrite. Parametric sensitivity analysis show that inhibition functions (fi) and dimensionless constants (βi) greatly affect predicted nitrite and nitrate consumption rates.

Keywords
Denitrification; Denitratation; Denitritation; Kinetics; Saline medium
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 40, Issue 6, 2 May 2007, Pages 1627–1634
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us