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Organic loading rate (OLR) regulation for enhancement of aerobic sludge granulation: Role of key microorganism and their function.
- Source :
-
The Science of the total environment [Sci Total Environ] 2019 Feb 25; Vol. 653, pp. 630-637. Date of Electronic Publication: 2018 Nov 02. - Publication Year :
- 2019
-
Abstract
- According to unique growth characteristics of various environmental microorganism specially with different substrates and their levels, aerobic sludge granulation are studied under different operation mode of influent organic loading rate (OLR), and the EPS component, sludge surface characters and functional microbes are analyzed to achieve a novel process for stable sludge granulation. Results showed that activated sludge cultivated under gradient influent OLR decreasing from 5.5 to 3.5 kgCOD m <superscript>-3</superscript> d <superscript>-1</superscript> achieved complete granulation with average size of 438 μm and exopolysaccharide (PS) to protein (PN) ratio over 2.0. Meanwhile, these granules had excellent flocculability and hydrophobicity with Zeta potential and contact angle of -15 mV and 110°, respectively. Principal component analysis (PCA) illustrated that microbes with function of EPS secretion enriched with decreased OLR regulation for their suitable specific growth characteristics, then promoted other microbes aggregation and sludge granulation along with the improvement of cellular surface characters and microbial niche.<br /> (Copyright © 2018. Published by Elsevier B.V.)
- Subjects :
- Aerobiosis
Flocculation
Bioreactors
Sewage analysis
Waste Disposal, Fluid methods
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1026
- Volume :
- 653
- Database :
- MEDLINE
- Journal :
- The Science of the total environment
- Publication Type :
- Academic Journal
- Accession number :
- 30414591
- Full Text :
- https://doi.org/10.1016/j.scitotenv.2018.10.418