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Characteristics of nitrifying granules developed in an air pulsing SBR

Paper ID Volume ID Publish Year Pages File Format Full-Text
35448 45090 2009 5 PDF Available
Title
Characteristics of nitrifying granules developed in an air pulsing SBR
Abstract

Nitrifying bacteria are characterized by low biomass yields and slow activity rates, the enhancement of nitrifying biomass retention by promoting the formation of granules would allow improving nitrification process. The use of a pulsing sequencing batch reactor (SBR) was tested to produce nitrifying granules minimizing the air consumption. After 400 days of operation, 1.07 g VSS/L of granular biomass with a mean diameter of 0.9 mm was accumulated in the system. The maximal nitrate production rate reached a value of 0.3 kg N/(m3 d).Sporadic nitrite accumulations were registered and attributed to oxygen diffusion limitations which were solved improving the granule-liquid mass transfer with a liquid recirculation system. FISH technique was used in order to identify the main populations in the nitrifying granules; Nitrosomonas spp. and Nitrospira spp. were identified as the main ammonia and nitrite oxidizing population, respectively. With the introduction of liquid recirculation in the reactor the ammonia oxidation efficiencies improved and the proportion of Nitrospira spp. increased from 1% to 15%.

Keywords
Aerobic granulation; Ammonia; Nitrification; Nitrite; Pulsation; Sequencing batch reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 44, Issue 5, May 2009, Pages 602–606
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