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Control and optimization of nitrifying communities for nitritation from domestic wastewater at room temperatures

Paper ID Volume ID Publish Year Pages File Format Full-Text
17449 42669 2009 7 PDF Available
Title
Control and optimization of nitrifying communities for nitritation from domestic wastewater at room temperatures
Abstract

To achieve nitritation from complete-nitrification seed sludge at room temperature of 19 ± 1 °C, a lab-scale sequencing batch reactor (SBR) treating domestic wastewater with low C/N ratios was operated to investigate the control and optimization of nitrifying communities. Ammonia oxidizing bacteria (AOB) dominance was enhanced through the combination of low DO concentrations (<1.0 mg/L) and preset short-cycle control of aeration time. Nitritation was successfully established with NO2−-N/NOx−-N over 95%. To avoid the adverse impact of low DO concentrations on AOB activities, DO concentrations were increased to 1–2 mg/L. At the normal DO levels and temperatures, on-line control strategy of aerobic durations maintained the stability of nitritation with nitrite accumulation rate over 95% and ammonia removal above 97%. Fluorescence in-situ hybridization (FISH) analysis presented that the maximal percentage of AOB in biomass reached 10.9% and nitrite oxidizing bacteria (NOB) were washed out.

Keywords
Nitritation; Domestic wastewater; Room temperature; Ammonia oxidizing bacteria
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Control and optimization of nitrifying communities for nitritation from domestic wastewater at room temperatures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 45, Issue 3, 7 September 2009, Pages 226–232
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