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A comparative study on the formation and characterization of aerobic 4-chloroaniline-degrading granules in SBR and SABR.
- Source :
-
Applied microbiology and biotechnology [Appl Microbiol Biotechnol] 2008 Jul; Vol. 79 (5), pp. 867-74. Date of Electronic Publication: 2008 May 01. - Publication Year :
- 2008
-
Abstract
- The formation and characterization of the aerobic 4-chloroaniline-degrading granules in the three column-type sequencing batch reactors were investigated in this paper. The granular sludge was observed since 15 days after start-up in R2 and R3 which had the high ratio of height to diameter (H/D). Since then and within the subsequent 75 days, the granulation of aerobic sludge was apparently developed by the decreased settling time and gradually increased 4-chloroaniline (4-ClA) concentration to above 400 mg.L(-1) in R1 to R3. The aerobic granules tended to be mature in all reactors continuously operated with 4-ClA loading rates of around 800 g.m(-3).d(-1), and the removal efficiencies of chemical oxygen demand, total nitrogen, and 4-ClA were maintained above 93%, 70%, and 99.9%, respectively. Mature aerobic granules in R1 to R3 featured with the average diameter of 0.78, 1.68, and 1.25 mm, minimal settling velocity of 20.5, 70.1 and 66.6 m.h(-1), specific 4-ClA degradation rates of 0.14, 0.21, and 0.27 g.gVSS(-1).d(-1), and the ratio of proteins to polysaccharides of 8.2, 10.8, and 13.7 mg.mg(-1), respectively. This study demonstrates that the reactor with a high H/D ratio and internal circulation favors the granulation and stabilization of aerobic sludge.
Details
- Language :
- English
- ISSN :
- 0175-7598
- Volume :
- 79
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Applied microbiology and biotechnology
- Publication Type :
- Academic Journal
- Accession number :
- 18449538
- Full Text :
- https://doi.org/10.1007/s00253-008-1476-4