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Size-dependent calcium carbonate precipitation induced microbiologically in aerobic granules

Size-dependent calcium carbonate precipitation induced microbiologically in aerobic granules
Size-dependent calcium carbonate precipitation induced microbiologically in aerobic granules
Calcium and ash accumulation in aerobic granules treating organic wastewater was investigated systematically in this study. It was found that ash content of granular sludge reached 43% at stable state of reactor operation with calcium carbonate precipitation as the main cause. Since granular sludge in the reactor at the steady state was the mixture of granules with different sizes, granules in the reactor on operation days 90, 120 and 150, respectively, were sorted into 10 categories by size to study the inorganic substances. It was found that calcium was selectively enriched in granules and the precipitation of calcium carbonate was just dependent on granule size instead of operation duration at the steady state. More calcium carbonate was precipitated in bigger aerobic granules, but both calcium and ash contents reached stable values when granule size was bigger than 700 ?m. Analysis by X-ray diffractometer disclosed that aragonite was the only polymorph of calcium carbonate detected in aerobic granules with size bigger than 300 ?m. Scanning electron microscope revealed clearly for the first time that bundles of needle shaped aragonite was embedded in extracellular polymeric substances of aerobic granules. A mechanism on calcium carbonate precipitation was proposed to deepen the understanding of biomineralization.
aerobic granules, precipitation, calcium carbonate, aragonite, extracellular polymeric substances (EPS), size
1385-8947
341-348
Liu, Yong-Qiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Lan, Gui-Hong
4d9d990e-1a6b-4343-864f-848bf7774bc1
Zeng, Ping
5434c435-d2d0-43fb-ac86-593f882f8e1c
Liu, Yong-Qiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Lan, Gui-Hong
4d9d990e-1a6b-4343-864f-848bf7774bc1
Zeng, Ping
5434c435-d2d0-43fb-ac86-593f882f8e1c

Liu, Yong-Qiang, Lan, Gui-Hong and Zeng, Ping (2016) Size-dependent calcium carbonate precipitation induced microbiologically in aerobic granules. Chemical Engineering Journal, 285, 341-348. (doi:10.1016/j.cej.2015.10.020).

Record type: Article

Abstract

Calcium and ash accumulation in aerobic granules treating organic wastewater was investigated systematically in this study. It was found that ash content of granular sludge reached 43% at stable state of reactor operation with calcium carbonate precipitation as the main cause. Since granular sludge in the reactor at the steady state was the mixture of granules with different sizes, granules in the reactor on operation days 90, 120 and 150, respectively, were sorted into 10 categories by size to study the inorganic substances. It was found that calcium was selectively enriched in granules and the precipitation of calcium carbonate was just dependent on granule size instead of operation duration at the steady state. More calcium carbonate was precipitated in bigger aerobic granules, but both calcium and ash contents reached stable values when granule size was bigger than 700 ?m. Analysis by X-ray diffractometer disclosed that aragonite was the only polymorph of calcium carbonate detected in aerobic granules with size bigger than 300 ?m. Scanning electron microscope revealed clearly for the first time that bundles of needle shaped aragonite was embedded in extracellular polymeric substances of aerobic granules. A mechanism on calcium carbonate precipitation was proposed to deepen the understanding of biomineralization.

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Accepted/In Press date: 1 October 2015
e-pub ahead of print date: 22 October 2015
Published date: 1 February 2016
Keywords: aerobic granules, precipitation, calcium carbonate, aragonite, extracellular polymeric substances (EPS), size
Organisations: Civil Maritime & Env. Eng & Sci Unit

Identifiers

Local EPrints ID: 384954
URI: http://eprints.soton.ac.uk/id/eprint/384954
ISSN: 1385-8947
PURE UUID: 0fd04e68-eaa9-4e02-9fee-a0585f598c15
ORCID for Yong-Qiang Liu: ORCID iD orcid.org/0000-0001-9688-1786

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Date deposited: 10 Dec 2015 16:52
Last modified: 15 Mar 2024 03:47

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Author: Yong-Qiang Liu ORCID iD
Author: Gui-Hong Lan
Author: Ping Zeng

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