Journal
BIORESOURCE TECHNOLOGY
Volume 200, Issue -, Pages 535-540Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.10.080
Keywords
Membrane bioreactor; Calcium ion; Salt shock; Bioflocculation; Membrane fouling rate
Funding
- National Science Foundation of China [51478093]
- Jilin Province Scientific and Technological Planning Project of China [20120404, 20130206061GX]
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Fouling propensity of activated sludge in membrane bioreactor (MBR) is closely related to the disturbance of a salt shock. In this work, the characteristics of membrane fouling and bioflocculation were compared in two laboratory-scale MBRs (one with calcium addition, MBR-Ca, the other without, MBR-C) with a transient salt shock. Particle size distributions, zeta potential, relative hydrophobicity, modified fouling index, the content of polysaccharides, proteins and calcium ions in different layers of sludge were monitored prior to, during and after the salt shock. Comparison with MBR-C showed that the recovery time and fouling rate of MBR-Ca were reduced by 50% and 34%, respectively. Remarkable variations of sludge properties in terms of bioflocculation, such as larger particle sizes, higher relative hydrophobicity and zeta potential, lower polysaccharides in supernatant, higher proteins/polysaccharides ratio in slime and loose bound extracellular polymeric substances, were observed in MBR-Ca after the salt shock. (C) 2015 Elsevier Ltd. All rights reserved.
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