Size-dependent anaerobic digestion rates of flocculated activated sludge: Role of intrafloc mass transfer resistance

C. P. Chu; D. G. Tsai; D. J. Lee; J. H. Tay

doi:10.1016/j.jenvman.2005.01.022

Size-dependent anaerobic digestion rates of flocculated activated sludge: Role of intrafloc mass transfer resistance

C. P. Chu
, D. G. Tsai
, D. J. Lee
, J. H. Tay

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

49 Citations (Scopus)

Abstract

The anaerobic digestion rate for flocculated sludge has been considered to be lower than that of original sludge, particularly in the later stages of digestion; Chu et al. (2003) attributed this relatively slower rate to the increased mass transfer resistance for reactants through the large flocs after flocculation. This study confirmed that methane production was retarded by flocculation. The structure of the floc was identified with fluorescence in situ hybridization (FISH) and a confocal laser scanning microscope (CLSM) technique. To verify the mass transfer resistance induced by flocculation, microsensors were applied to assess the response of oxygen concentration distribution inside the flocs that are subjected to sudden changes in ambient oxygen levels. Response time for the electrode at a floc's center was five times greater than the response time in original sludge flocs. Although the effective diffusivity of oxygen in the floc increased by 2.3 times after flocculation, the increased size of the flocculated floc was the major contributor to the total mass transfer resistance to oxygen. © 2005 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	239-244
Journal	Journal of Environmental Management
Volume	76
Issue number	3
DOIs	https://doi.org/10.1016/j.jenvman.2005.01.022
Publication status	Published - Aug 2005
Externally published	Yes

Bibliographical note

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].

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 6 Clean Water and Sanitation

Research Keywords

Activated sludge
Anaerobic digestion
CLSM
Mass transfer resistance

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10.1016/j.jenvman.2005.01.022

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abstract = "The anaerobic digestion rate for flocculated sludge has been considered to be lower than that of original sludge, particularly in the later stages of digestion; Chu et al. (2003) attributed this relatively slower rate to the increased mass transfer resistance for reactants through the large flocs after flocculation. This study confirmed that methane production was retarded by flocculation. The structure of the floc was identified with fluorescence in situ hybridization (FISH) and a confocal laser scanning microscope (CLSM) technique. To verify the mass transfer resistance induced by flocculation, microsensors were applied to assess the response of oxygen concentration distribution inside the flocs that are subjected to sudden changes in ambient oxygen levels. Response time for the electrode at a floc's center was five times greater than the response time in original sludge flocs. Although the effective diffusivity of oxygen in the floc increased by 2.3 times after flocculation, the increased size of the flocculated floc was the major contributor to the total mass transfer resistance to oxygen. {\textcopyright} 2005 Elsevier Ltd. All rights reserved.",

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doi = "10.1016/j.jenvman.2005.01.022",

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TY - JOUR

T1 - Size-dependent anaerobic digestion rates of flocculated activated sludge

T2 - Role of intrafloc mass transfer resistance

AU - Chu, C. P.

AU - Tsai, D. G.

AU - Lee, D. J.

AU - Tay, J. H.

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 - 2005/8

Y1 - 2005/8

N2 - The anaerobic digestion rate for flocculated sludge has been considered to be lower than that of original sludge, particularly in the later stages of digestion; Chu et al. (2003) attributed this relatively slower rate to the increased mass transfer resistance for reactants through the large flocs after flocculation. This study confirmed that methane production was retarded by flocculation. The structure of the floc was identified with fluorescence in situ hybridization (FISH) and a confocal laser scanning microscope (CLSM) technique. To verify the mass transfer resistance induced by flocculation, microsensors were applied to assess the response of oxygen concentration distribution inside the flocs that are subjected to sudden changes in ambient oxygen levels. Response time for the electrode at a floc's center was five times greater than the response time in original sludge flocs. Although the effective diffusivity of oxygen in the floc increased by 2.3 times after flocculation, the increased size of the flocculated floc was the major contributor to the total mass transfer resistance to oxygen. © 2005 Elsevier Ltd. All rights reserved.

AB - The anaerobic digestion rate for flocculated sludge has been considered to be lower than that of original sludge, particularly in the later stages of digestion; Chu et al. (2003) attributed this relatively slower rate to the increased mass transfer resistance for reactants through the large flocs after flocculation. This study confirmed that methane production was retarded by flocculation. The structure of the floc was identified with fluorescence in situ hybridization (FISH) and a confocal laser scanning microscope (CLSM) technique. To verify the mass transfer resistance induced by flocculation, microsensors were applied to assess the response of oxygen concentration distribution inside the flocs that are subjected to sudden changes in ambient oxygen levels. Response time for the electrode at a floc's center was five times greater than the response time in original sludge flocs. Although the effective diffusivity of oxygen in the floc increased by 2.3 times after flocculation, the increased size of the flocculated floc was the major contributor to the total mass transfer resistance to oxygen. © 2005 Elsevier Ltd. All rights reserved.

KW - Activated sludge

KW - Anaerobic digestion

KW - CLSM

KW - Mass transfer resistance

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U2 - 10.1016/j.jenvman.2005.01.022

DO - 10.1016/j.jenvman.2005.01.022

M3 - RGC 21 - Publication in refereed journal

C2 - 15932786

SN - 0301-4797

VL - 76

SP - 239

EP - 244

JO - Journal of Environmental Management

JF - Journal of Environmental Management

IS - 3

ER -

Size-dependent anaerobic digestion rates of flocculated activated sludge: Role of intrafloc mass transfer resistance

Abstract

Bibliographical note

UN SDGs

Research Keywords

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