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Empirical model of the pH dependence of the maximum specific nitrification rate

Paper ID Volume ID Publish Year Pages File Format Full-Text
35907 45113 2007 6 PDF Available
Title
Empirical model of the pH dependence of the maximum specific nitrification rate
Abstract

A bell-shaped empirical model was proposed to describe the pH-dependent behavior of the maximum specific substrate utilization rates (MSSUR, qˆpH) of ammonium and nitrite oxidations. The model was developed using a cosine function. The model satisfactorily captured the bell-shape decrease of the MSSUR as the pH deviated from the optima. Analysis of 7 experimental data sets gave that the optimum pH (pHopt) lied in the range of 8.2 ± 0.3 for ammonium oxidizing bacteria (AOB) and 7.9 ± 0.4 for nitrite oxidizing bacteria (NOB). The pH range (ww) within which the MSSUR maintained above a half of the greatest MSSUR (qˆmax) was 3.1 ± 0.4 for AOB and 2.2 ± 0.4 for NOB, which means that NOB is more sensitive to pH changes. Since the pHopt and the pH range (ww) for NOB were smaller than those for AOB, it was inferred that a selective enrichment of AOB and consequent nitrite accumulation could be possible at an alkaline pH near or greater than the pHopt of AOB.

Keywords
Ammonium oxidizing bacteria (AOB); Empirical model; pH; Maximum specific substrate utilization rate; Nitrite oxidizing bacteria (NOB)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 42, Issue 12, December 2007, Pages 1671–1676
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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