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Nitrification–denitrification via nitrite in SBR using real-time control strategy when treating domestic wastewater

Paper ID Volume ID Publish Year Pages File Format Full-Text
4798 246 2007 6 PDF Available
Title
Nitrification–denitrification via nitrite in SBR using real-time control strategy when treating domestic wastewater
Abstract

A lab-scale sequencing batch reactor (SBR) was employed to treat low C/N ratio municipal wastewater to investigate the stability of nitrification–denitrification via nitrite using a real-time control strategy to switch aeration on and off. Three parameters, pH, DO and ORP, were selected as control parameters in the SBR reactor operation. Nitrite accumulation was observed under real-time control conditions (NO2−-N/NOx−-N > 0.8), implying that nitrification–denitrification mainly via nitrite was achieved by the process control strategy applied. The nitrite concentration in the SBR decreased sharply when the SBR system was operated using a fixed time aeration control strategy for 7 days. Ammonia nitrogen concentration (NH4+-N) and temperature also affect nitrite accumulation. Ammonia shock loads limited nitrification due to alkalinity limitations, but the system recovered quickly from short-time high ammonia shock loads when the real-time control strategy was applied. Temperature was observed to affect nitrite accumulation rate when the real-time control strategy was used in the SBR reactor, with higher nitrite accumulation at 28 ± 0.5 °C (NO2−-N/NOx−-N = 0.84), compared to the accumulation at the ambient average temperature of 20 °C (NO2−-N/NOx−-N > 0.61).

Keywords
SBR; Real-time control; Nitrification–denitrification via nitrite; Ammonia shocking; Temperature
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 36, Issue 2, 15 September 2007, Pages 87–92
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