Microstructural strength deterioration of aerobic granule sludge under organic loading swap

Chunli Wan; Yanggui Shen; Si Chen; Xiang Liu; Guangmin Liu; Juin-Yih Lai; Duu-Jong Lee

doi:10.1016/j.biortech.2016.09.056

Microstructural strength deterioration of aerobic granule sludge under organic loading swap

Chunli Wan, Yanggui Shen, Si Chen, Xiang Liu, Guangmin Liu, Juin-Yih Lai, Duu-Jong Lee^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

21 Citations (Scopus)

Abstract

This study revealed that the gross indicators commonly adopted for monitoring the performance of aerobic granular sludge processes are not capable of probing the microstructural deterioration of granule interior upon organic loading swaps. These granules subjected to loading swaps retained their global characteristics: appearances, sizes and settling velocities, chemical oxygen demand (COD) and ammonia–nitrogen removal capacities. However, the granule interior strength, as determined by ultrasound method, was largely weakened upon COD switch-off and was not recovered in the subsequent COD re-supply stage. In response to COD switch-off, the 5.6 kDa polysaccharides component of granule extracellular polymeric substances (EPS) was diminished. Correspondingly, two bacterial species, Thauera and Sphingomonas sp., were faded away together with the significant decline in contents of intracellular cyclic dimeric GMP (c-di-GMP). The microstructural integrity of granules was seriously deteriorated upon COD switch-off, which was not detectable by the commonly adopted gross indicators.

Original language	English
Pages (from-to)	671-676
Journal	Bioresource Technology
Volume	221
DOIs	https://doi.org/10.1016/j.biortech.2016.09.056
Publication status	Published - 1 Dec 2016
Externally published	Yes

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Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Research Keywords

Bacterial community
Extracellular polymeric substances
Signal molecules
Strength

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title = "Microstructural strength deterioration of aerobic granule sludge under organic loading swap",

abstract = "This study revealed that the gross indicators commonly adopted for monitoring the performance of aerobic granular sludge processes are not capable of probing the microstructural deterioration of granule interior upon organic loading swaps. These granules subjected to loading swaps retained their global characteristics: appearances, sizes and settling velocities, chemical oxygen demand (COD) and ammonia–nitrogen removal capacities. However, the granule interior strength, as determined by ultrasound method, was largely weakened upon COD switch-off and was not recovered in the subsequent COD re-supply stage. In response to COD switch-off, the 5.6 kDa polysaccharides component of granule extracellular polymeric substances (EPS) was diminished. Correspondingly, two bacterial species, Thauera and Sphingomonas sp., were faded away together with the significant decline in contents of intracellular cyclic dimeric GMP (c-di-GMP). The microstructural integrity of granules was seriously deteriorated upon COD switch-off, which was not detectable by the commonly adopted gross indicators.",

keywords = "Bacterial community, Extracellular polymeric substances, Signal molecules, Strength",

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doi = "10.1016/j.biortech.2016.09.056",

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T1 - Microstructural strength deterioration of aerobic granule sludge under organic loading swap

AU - Wan, Chunli

AU - Shen, Yanggui

AU - Chen, Si

AU - Liu, Xiang

AU - Liu, Guangmin

AU - Lai, Juin-Yih

AU - Lee, Duu-Jong

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2016/12/1

Y1 - 2016/12/1

N2 - This study revealed that the gross indicators commonly adopted for monitoring the performance of aerobic granular sludge processes are not capable of probing the microstructural deterioration of granule interior upon organic loading swaps. These granules subjected to loading swaps retained their global characteristics: appearances, sizes and settling velocities, chemical oxygen demand (COD) and ammonia–nitrogen removal capacities. However, the granule interior strength, as determined by ultrasound method, was largely weakened upon COD switch-off and was not recovered in the subsequent COD re-supply stage. In response to COD switch-off, the 5.6 kDa polysaccharides component of granule extracellular polymeric substances (EPS) was diminished. Correspondingly, two bacterial species, Thauera and Sphingomonas sp., were faded away together with the significant decline in contents of intracellular cyclic dimeric GMP (c-di-GMP). The microstructural integrity of granules was seriously deteriorated upon COD switch-off, which was not detectable by the commonly adopted gross indicators.

AB - This study revealed that the gross indicators commonly adopted for monitoring the performance of aerobic granular sludge processes are not capable of probing the microstructural deterioration of granule interior upon organic loading swaps. These granules subjected to loading swaps retained their global characteristics: appearances, sizes and settling velocities, chemical oxygen demand (COD) and ammonia–nitrogen removal capacities. However, the granule interior strength, as determined by ultrasound method, was largely weakened upon COD switch-off and was not recovered in the subsequent COD re-supply stage. In response to COD switch-off, the 5.6 kDa polysaccharides component of granule extracellular polymeric substances (EPS) was diminished. Correspondingly, two bacterial species, Thauera and Sphingomonas sp., were faded away together with the significant decline in contents of intracellular cyclic dimeric GMP (c-di-GMP). The microstructural integrity of granules was seriously deteriorated upon COD switch-off, which was not detectable by the commonly adopted gross indicators.

KW - Bacterial community

KW - Extracellular polymeric substances

KW - Signal molecules

KW - Strength

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U2 - 10.1016/j.biortech.2016.09.056

DO - 10.1016/j.biortech.2016.09.056

M3 - RGC 21 - Publication in refereed journal

C2 - 27660187

SN - 0960-8524

VL - 221

SP - 671

EP - 676

JO - Bioresource Technology

JF - Bioresource Technology

ER -

Microstructural strength deterioration of aerobic granule sludge under organic loading swap

Abstract

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