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Effective and robust partial nitrification to nitrite by real-time aeration duration control in an SBR treating domestic wastewater

Paper ID Volume ID Publish Year Pages File Format Full-Text
35334 45087 2009 7 PDF Available
Title
Effective and robust partial nitrification to nitrite by real-time aeration duration control in an SBR treating domestic wastewater
Abstract

Achieving sustainable partial nitrification to nitrite has been proven difficult in treating low strength nitrogenous wastewater. Real-time aeration duration control was used to achieve efficient partial nitrification to nitrite in a sequencing batch reactor (SBR) to treat low strength domestic wastewater. Above 90% nitrite accumulation ratio was maintained for long-term operation at normal condition, or even lower water temperature in winter. Partial nitrification established by controlling aeration duration showed good performance and robustness even though encountering long-term extended aeration and starvation period. Process control enhanced the successful accumulation of ammonia oxidizing bacteria (AOB) and washout of nitrite oxidizing bacteria (NOB). Scanning electron microscope observations indicated that the microbial morphology showed a shift towards small rod-shaped clusters. Fluorescence in situ hybridization (FISH) results demonstrated AOB were the dominant nitrifying bacteria, up to 8.3 ± 1.1% of the total bacteria; on the contrary, the density of NOB decreased to be negligible after 135 days operation since adopting process control.

Keywords
Partial nitrification to nitrite; Aeration duration control; Nitrite accumulation; Ammonia oxidizing bacteria (AOB); Nitrite oxidizing bacteria (NOB); Sequencing batch reactor (SBR)
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Effective and robust partial nitrification to nitrite by real-time aeration duration control in an SBR treating domestic wastewater
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 44, Issue 9, September 2009, Pages 979–985
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