While inoculating pre-acclimatized floccular sludge, nitrite-denitrifying granular sludge was obtained after approximately 40 days of cultivation in a 10 L upflow sludge blanket (USB) reactor. The nitrite removal efficiency was approximately 95% when the nitrite concentration was 50 mg L−1at an influent flow rate of 20 L h−1. The nitrite granular sludge had several notable features including good settleability (110 m h−1), high ash content (79%), and high density (1.248 g cm−3). The mixed liquor suspended solids (MLSS) of the sludge bed remained at 130.04 g L−1, at a hydraulic upflow velocity of 2 m h−1. These interesting characteristics were attributed to a high effluent pH (9.7) caused by the release of alkalinity during the nitrite denitrification process. The surfaces of the granules were dominated by cocci bacteria with a diameter of approximately 3 μm, which could be classified as Nitrosomonas-like species based on our analysis of 16 S rDNA sequences.
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Research Article|
April 01 2012
Characteristics of denitrifying granular sludge grown on nitrite medium in an upflow sludge blanket (USB) reactor Available to Purchase
Xibiao Jin;
1Research Institute of Environmental Engineering, East China University of Science & Technology, Shanghai 200237, China
E-mail: [email protected]
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Feng Wang;
Feng Wang
1Research Institute of Environmental Engineering, East China University of Science & Technology, Shanghai 200237, China
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Guohong Liu;
Guohong Liu
1Research Institute of Environmental Engineering, East China University of Science & Technology, Shanghai 200237, China
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Yongdi Liu
Yongdi Liu
1Research Institute of Environmental Engineering, East China University of Science & Technology, Shanghai 200237, China
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Water Sci Technol (2012) 65 (8): 1420–1427.
Article history
Received:
September 26 2011
Accepted:
November 30 2011
Citation
Xibiao Jin, Feng Wang, Guohong Liu, Yongdi Liu; Characteristics of denitrifying granular sludge grown on nitrite medium in an upflow sludge blanket (USB) reactor. Water Sci Technol 1 April 2012; 65 (8): 1420–1427. doi: https://doi.org/10.2166/wst.2012.021
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