Performance of anaerobic membrane bioreactor during digestion and thickening of aerobic membrane bioreactor excess sludge

•Anaerobic membrane bioreactor was applied to the treatment of excess sludge.•Sludge was thickened and digested without membrane cleaning for 90days.•A high COD removal efficiency of 98% was achieved. In this study, we evaluated the performance of an anaerobic membrane bioreactor in terms of digesti...

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Bibliographic Details
Published in:Bioresource technology 2016-10, Vol.218, p.476-479
Main Authors: Hafuka, Akira, Mimura, Kazuhisa, Ding, Qing, Yamamura, Hiroshi, Satoh, Hisashi, Watanabe, Yoshimasa
Format: Article
Language:English
Subjects:
Anaerobic digestion
Anaerobiosis
Biofuels
biogas
Biological Oxygen Demand Analysis
Bioreactors
Biotechnology - methods
Excess sludge
Filtration
gas production (biological)
Gases
Hydrolysis
membrane bioreactors
Membrane filtration
Membranes, Artificial
Microfiltration
polytetrafluoroethylene
Sewage - chemistry
sludge
Tubular PTFE membrane module
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Summary:•Anaerobic membrane bioreactor was applied to the treatment of excess sludge.•Sludge was thickened and digested without membrane cleaning for 90days.•A high COD removal efficiency of 98% was achieved. In this study, we evaluated the performance of an anaerobic membrane bioreactor in terms of digestion and thickening of excess sludge from an aerobic membrane bioreactor. A digestion reactor equipped with an external polytetrafluoroethylene tubular microfiltration membrane module was operated in semi-batch mode. Solids were concentrated by repeated membrane filtration and sludge feeding, and their concentration reached 25,400mg/L after 92d. A high chemical oxygen demand (COD) removal efficiency, i.e., 98%, was achieved during operation. A hydraulic retention time of 34d and a pulse organic loading rate of 2200mg-COD/(L-reactor) gave a biogas production rate and biogas yield of 1.33L/(reactor d) and 0.08L/g-CODinput, respectively. The external membrane unit worked well without membrane cleaning for 90d. The transmembrane pressure reached 25kPa and the filtration flux decreased by 80% because of membrane fouling after operation for 90d.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.06.124