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Title: Organics transformation and energy production potential in a high rate A-stage system: a demo-scale study
Authors: Cao, Shenbin
Lu, Dan
Phua, KianMing
Yan, Wangwang
Le, Chencheng
Tao, Guihe
Zhou, Yan
Keywords: Engineering::Environmental engineering
Issue Date: 2020
Source: Cao, S., Lu, D., Phua, K., Yan, W., Le, C., Tao, G. & Zhou, Y. (2020). Organics transformation and energy production potential in a high rate A-stage system: a demo-scale study. Bioresource Technology, 295, 122300-.
Journal: Bioresource Technology 
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.
ISSN: 0960-8524
DOI: 10.1016/j.biortech.2019.122300
Schools: School of Civil and Environmental Engineering 
Research Centres: Nanyang Environment and Water Research Institute 
Rights: © 2019 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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