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Aerobic granulation with low strength wastewater at low aeration rate in A/O/A SBR reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
17409 42666 2011 8 PDF Available
Title
Aerobic granulation with low strength wastewater at low aeration rate in A/O/A SBR reactor
Abstract

The formation of aerobic granules with low organic loading synthetic wastewater (150–200 mg L−1 of influent COD, acetate/propionate = 1/3) at low aeration rate (0.6 cm s−1 of superficial gas velocity) had been investigated in the anaerobic/oxic/anoxic SBR. Aerobic granules with smooth surface and compact structure were successfully obtained after 50 days. However, these aerobic granules were unstable when the d(0.9) of granules increased to more than 1 mm. The results suggested that the aerobic granules with small diameter (smaller than 1000 μm) were more favorable for treating the low substrate loading wastewater at the low aeration rate. The cycle test revealed that most of the influent COD was removed at the anaerobic stage. The effluent concentrations of N–NH4+ and P–PO43− were lower than 1 mg L−1, and the effluent concentration of nitrate gradually decreased with the granulation. Phosphate accumulating organisms were found to utilize O2 or NOx− as electron acceptor for phosphorus removal in the study. Simultaneous nitrogen and phosphorus removal occurred inside the granules.

Keywords
Aerobic granulation; Low-strength wastewater; Low shear force; Simultaneous nitrification and denitrification; Denitrifying phosphate accumulating organisms
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Aerobic granulation with low strength wastewater at low aeration rate in A/O/A SBR reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 49, Issue 2, 10 July 2011, Pages 215–222
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