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An efficient DPB utilization process: The modified A2N process

Paper ID Volume ID Publish Year Pages File Format Full-Text
4562 232 2008 6 PDF Available
Title
An efficient DPB utilization process: The modified A2N process
Abstract

The modified A2N process was proposed on basis of the A2N process. There are two waste sludge lines in the modified A2N process: an AN (anaerobic-anoxic) waste sludge line and an AO (anaerobic–aerobic) waste sludge line. Denitrifying phosphorus removing bacteria (DPB) and common phosphorus accumulation organisms (PAOs) coexisted in the modified A2N process but was relatively separated. Two streams of mixed liquor suspended solid (MLSS) were out of the anaerobic tank with one entering the anoxic tank, where DPB was the dominant microorganism, and the other the nitrification tank, where the aerobic PAOs dominated. The effects of pH and DO on process performance were investigated. Results showed that DPB might be more pH tolerable than aerobic PAOs while DPB and aerobic PAOs shared similar responses to DO. Parameters optimization was conducted and the following optimized parameters obtained: DO in nitrification tank was 2–3 mg L−1; nominal HRT for each unit (anaerobic, anoxic and aerobic units) was 3 h; SRT was 15 d. When the influent nutrient mass ratio (C/N/P) was 26.6/7.67/1 to 26.6/3/1, the average effluent COD, TN, and TP concentrations of the optimized process were 45, 10.5 and 0.7 mg L−1, respectively, with average removal efficiency 89%, 95.3% and 76.7% for COD, TN and TP.

Keywords
Modified A2N process; Denitrifying phosphorus removing bacteria (DPB); Two waste sludge lines; Biological nutrient removal (BNR)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 38, Issue 2, 15 February 2008, Pages 158–163
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