Organics transformation and energy production potential in a high rate A-stage system: A demo-scale study

Shenbin Cao; Dan Lu; Kian Ming Phua; Wangwang Yan; Chencheng Le; Guihe Tao; Yan Zhou

doi:10.1016/j.biortech.2019.122300

Organics transformation and energy production potential in a high rate A-stage system: A demo-scale study

Shenbin Cao, Dan Lu, Kian Ming Phua, Wangwang Yan, Chencheng Le, Guihe Tao, Yan Zhou^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

Current high-rate activated sludge (HRAS) process is an aerobic A-stage process that would cause significant organic loss resulted from the mineralization. In this study, the feasibility of operating a high rate A-stage without aeration (HRNS) was carried out in a demo-scale plant (275 m³/h). The organics transformation and energy production potential in A-stage were explored. The developed A-stage process was demonstrated to be more effective for organics recovery compared to that operated with aeration (53.82% versus 40.94%), despite its relatively low total COD removal efficiency (54.3% versus 63.5% with aeration). Minor organics (accounted for 1.75% of incoming COD) was found to be lost in HRNS process. Moreover, sludge generated from HRNS had higher degradability and higher methane compared to that from HRAS. Overall, this study documented the feasibility of high rate A-stage without aeration, and acted as a guide in achieving energy neutrality or even energy-positive wastewater treatment.

Original language	English
Article number	122300
Journal	Bioresource Technology
Volume	295
DOIs	https://doi.org/10.1016/j.biortech.2019.122300
Publication status	Published - Jan 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2019 Elsevier Ltd

ASJC Scopus Subject Areas

Bioengineering
Environmental Engineering
Renewable Energy, Sustainability and the Environment
Waste Management and Disposal

Keywords

Biochemical methane potential (BMP)
COD capture
Energy recovery
High rate A-stage
Municipal wastewater
Organics transformation

UN SDGs

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

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10.1016/j.biortech.2019.122300

Cite this

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title = "Organics transformation and energy production potential in a high rate A-stage system: A demo-scale study",

abstract = "Current high-rate activated sludge (HRAS) process is an aerobic A-stage process that would cause significant organic loss resulted from the mineralization. In this study, the feasibility of operating a high rate A-stage without aeration (HRNS) was carried out in a demo-scale plant (275 m3/h). The organics transformation and energy production potential in A-stage were explored. The developed A-stage process was demonstrated to be more effective for organics recovery compared to that operated with aeration (53.82% versus 40.94%), despite its relatively low total COD removal efficiency (54.3% versus 63.5% with aeration). Minor organics (accounted for 1.75% of incoming COD) was found to be lost in HRNS process. Moreover, sludge generated from HRNS had higher degradability and higher methane compared to that from HRAS. Overall, this study documented the feasibility of high rate A-stage without aeration, and acted as a guide in achieving energy neutrality or even energy-positive wastewater treatment.",

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author = "Shenbin Cao and Dan Lu and Phua, {Kian Ming} and Wangwang Yan and Chencheng Le and Guihe Tao and Yan Zhou",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2020",

month = jan,

doi = "10.1016/j.biortech.2019.122300",

language = "English",

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journal = "Bioresource Technology",

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T2 - A demo-scale study

AU - Cao, Shenbin

AU - Lu, Dan

AU - Phua, Kian Ming

AU - Yan, Wangwang

AU - Le, Chencheng

AU - Tao, Guihe

AU - Zhou, Yan

PY - 2020/1

Y1 - 2020/1

N2 - Current high-rate activated sludge (HRAS) process is an aerobic A-stage process that would cause significant organic loss resulted from the mineralization. In this study, the feasibility of operating a high rate A-stage without aeration (HRNS) was carried out in a demo-scale plant (275 m3/h). The organics transformation and energy production potential in A-stage were explored. The developed A-stage process was demonstrated to be more effective for organics recovery compared to that operated with aeration (53.82% versus 40.94%), despite its relatively low total COD removal efficiency (54.3% versus 63.5% with aeration). Minor organics (accounted for 1.75% of incoming COD) was found to be lost in HRNS process. Moreover, sludge generated from HRNS had higher degradability and higher methane compared to that from HRAS. Overall, this study documented the feasibility of high rate A-stage without aeration, and acted as a guide in achieving energy neutrality or even energy-positive wastewater treatment.

AB - Current high-rate activated sludge (HRAS) process is an aerobic A-stage process that would cause significant organic loss resulted from the mineralization. In this study, the feasibility of operating a high rate A-stage without aeration (HRNS) was carried out in a demo-scale plant (275 m3/h). The organics transformation and energy production potential in A-stage were explored. The developed A-stage process was demonstrated to be more effective for organics recovery compared to that operated with aeration (53.82% versus 40.94%), despite its relatively low total COD removal efficiency (54.3% versus 63.5% with aeration). Minor organics (accounted for 1.75% of incoming COD) was found to be lost in HRNS process. Moreover, sludge generated from HRNS had higher degradability and higher methane compared to that from HRAS. Overall, this study documented the feasibility of high rate A-stage without aeration, and acted as a guide in achieving energy neutrality or even energy-positive wastewater treatment.

KW - Biochemical methane potential (BMP)

KW - COD capture

KW - Energy recovery

KW - High rate A-stage

KW - Municipal wastewater

KW - Organics transformation

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Organics transformation and energy production potential in a high rate A-stage system: A demo-scale study

Abstract

Bibliographical note

ASJC Scopus Subject Areas

Keywords

UN SDGs

Access to Document

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