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Optimized operational strategies based on maximum nitritation, stability, and nitrite accumulation potential in a continuous partial nitritation reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
34152 45005 2016 11 PDF Available
Title
Optimized operational strategies based on maximum nitritation, stability, and nitrite accumulation potential in a continuous partial nitritation reactor
Abstract

•Relative nitritation rates and nitrite accumulation potentials were assessed.•Maximum and stable nitritation activity region under various conditions was identified.•Desired nitritation performance can be achieved by optimizing SRT, pH and DO.

The relative nitritation rate (qAOB*), nitratation rate (qNOB*), and nitrite accumulation potential (NAP,qAOB*/qNOB*) were investigated to assess the operational conditions for stable and maximized nitritation in a continuous-stirred tank reactor (CSTR) with activated (flocculent) sludge. Novel stability ridge and pH optima curves were identified on a STAN-pH plane. The stability ridge divides the stable and unstable reaction regions, while the pH optima curve identifies optimal pH values for fastest nitritation at any desired STAN. Thus, the best operational pH for a desired STAN is found on the pH optima curve when it resides in the stable region; otherwise, the stability ridge itself indicates the best operational pH value. The locations of the stability ridge and pH optima are subject to the structure of the kinetic equation and parameter values. While the NAP decreases with an increase in DO, a necessary NAP for sufficient nitrite accumulation (e.g., NAP ≥ 2) is still ensured unless STAN becomes very low (e.g., ≤ 40 mgN/L). Consequently, desired nitritation performance can be achieved by optimizing both the sludge retention time and pH; a lower pH is essential to generate an anammox-suited feed. Modelling results were verified by treating a semi-synthetic sewage sludge digester effluent having ∼600 mgTAN/L at 30 °C and varying pH.

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Keywords
Relative nitritation rate; Nitrite accumulation potential; Optimal ammonium concentration; pH optima; Stability ridge; Unstable region
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Optimized operational strategies based on maximum nitritation, stability, and nitrite accumulation potential in a continuous partial nitritation reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 51, Issue 8, August 2016, Pages 1058–1068
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