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Excessive precipitation of CaCO3 as aragonite in a continuous aerobic granular sludge reactor

Excessive precipitation of CaCO3 as aragonite in a continuous aerobic granular sludge reactor
Excessive precipitation of CaCO3 as aragonite in a continuous aerobic granular sludge reactor
A hybrid airlift reactor was adopted to retain aerobic granules in the reactor successfully for continuous operation. It was found that aerobic granules maintained excellent physical structure stability in the continuous-flow reactor with reactor performance as good as batch operation. However, flocs appeared after batch operation was switched to continuous operation, and chemical oxygen demand (COD) in the wastewater was thus removed by co-existed granules and flocs in the reactor. Furthermore, excessive precipitation of CaCO3 as needled shaped aragonite in the continuous aerobic granular sludge reactor was observed, which led to the further enhancement of settling ability of granules with sludge volume index (SVI) reduction from 32 to 2 ml g?1 but specific oxygen utilization rate (SOUR) decrease from 61 to 23 mg O2 g?1 MLVSS h?1. Thus, apart from the physical structure stability, bioactivity stability of granules should be also considered as an important parameter to evaluate the continuous operation of aerobic granular sludge. Furthermore, the decrease in granule polysaccharide content implied that protein was more important for aragonite precipitation. The excessive aragonite precipitation in the continuous-flow reactor could be due to the competition between flocs and granules. In addition, the degradation of polysaccharide in aerobic granules under a continuous-flow mode may also contribute to excessive aragonite precipitation.
aerobic granules, precipitation, aragonite, calcium carbonate, continuous, polysaccharide, protein, extracellular polymeric substances (EPS)
0175-7598
1-10
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Lan, Guihong
0ae877a8-10a5-4c24-add4-c4c9c8f0ec43
Zeng, Ping
5434c435-d2d0-43fb-ac86-593f882f8e1c
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Lan, Guihong
0ae877a8-10a5-4c24-add4-c4c9c8f0ec43
Zeng, Ping
5434c435-d2d0-43fb-ac86-593f882f8e1c

Liu, Yongqiang, Lan, Guihong and Zeng, Ping (2016) Excessive precipitation of CaCO3 as aragonite in a continuous aerobic granular sludge reactor. Applied Microbiology and Biotechnology, 1-10. (doi:10.1007/s00253-015-6727-6).

Record type: Article

Abstract

A hybrid airlift reactor was adopted to retain aerobic granules in the reactor successfully for continuous operation. It was found that aerobic granules maintained excellent physical structure stability in the continuous-flow reactor with reactor performance as good as batch operation. However, flocs appeared after batch operation was switched to continuous operation, and chemical oxygen demand (COD) in the wastewater was thus removed by co-existed granules and flocs in the reactor. Furthermore, excessive precipitation of CaCO3 as needled shaped aragonite in the continuous aerobic granular sludge reactor was observed, which led to the further enhancement of settling ability of granules with sludge volume index (SVI) reduction from 32 to 2 ml g?1 but specific oxygen utilization rate (SOUR) decrease from 61 to 23 mg O2 g?1 MLVSS h?1. Thus, apart from the physical structure stability, bioactivity stability of granules should be also considered as an important parameter to evaluate the continuous operation of aerobic granular sludge. Furthermore, the decrease in granule polysaccharide content implied that protein was more important for aragonite precipitation. The excessive aragonite precipitation in the continuous-flow reactor could be due to the competition between flocs and granules. In addition, the degradation of polysaccharide in aerobic granules under a continuous-flow mode may also contribute to excessive aragonite precipitation.

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More information

Accepted/In Press date: 25 May 2015
e-pub ahead of print date: 9 June 2015
Published date: March 2016
Keywords: aerobic granules, precipitation, aragonite, calcium carbonate, continuous, polysaccharide, protein, extracellular polymeric substances (EPS)
Organisations: Water & Environmental Engineering Group

Identifiers

Local EPrints ID: 378076
URI: https://eprints.soton.ac.uk/id/eprint/378076
ISSN: 0175-7598
PURE UUID: 41aa2991-3a95-41ff-85c8-8598ddaa56ad

Catalogue record

Date deposited: 16 Jun 2015 10:23
Last modified: 15 Jul 2019 21:15

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Contributors

Author: Yongqiang Liu
Author: Guihong Lan
Author: Ping Zeng

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