Formation and Characteristics of Aerobic Granular Sludge for Simultaneous Phosphorus and Nitrogen Removal in a SBR

Abstract:

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With inoculum sludge from a conventional activated sludge wastewater treatment plant, formation of aerobic granular sludge for simultaneous phosphorus and nitrogen removal was realized in a sequencing batch reactor by the selective pressure as a driving force. Selective pressure created by means of decreasing sedimentation time and increasing substrate loading enhanced the formation of aerobic granular sludge, which followed four consecutive stages: acclimation, granulation, growth and maturation. Under the condition that the substrate loading were increased to 500mg COD/(L•d) and 48mg NH4 +-N/(L•d), the granules were the dominant sludge forms with most of diameter about 0.5–2.0 mm, a minimal settling velocity of 0.55 cm/s and a MLSS of 6800 mg/L after 120 days operation. The granules were composed of filamentous species with varying degrees of rod- and coccal-type bacteria. Microscopic examination revealed that granules microecosystem was more stable and should be less vulnerable to the changes of mixed liquor condition.

Info:

Periodical:

Advanced Materials Research (Volumes 356-360)

Edited by:

Hexing Li, Qunjie Xu and Daquan Zhang

Pages:

1630-1636

DOI:

10.4028/www.scientific.net/AMR.356-360.1630

Citation:

G. J. Yang et al., "Formation and Characteristics of Aerobic Granular Sludge for Simultaneous Phosphorus and Nitrogen Removal in a SBR", Advanced Materials Research, Vols. 356-360, pp. 1630-1636, 2012

Online since:

October 2011

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$35.00

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