期刊
BIORESOURCE TECHNOLOGY
卷 351, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.126965
关键词
A-stage; Anaerobic membrane bioreactor; Sludge digestion; Energy recovery; Nutrient recovery
资金
- Istanbul Water and Sewerage Administration (ISKI)
- Turkish Academy of Sciences (TUBA)
- Istanbul Technical University, Turkey [MDK-202142990, MYL-2020-42701]
This study found that treating A-stage sludge was more efficient in terms of methane production and methanogenic activity compared to treating primary sludge. Introducing an A-stage treatment can significantly increase the recovery of organic matter in wastewater as methane.
Energy-rich sludge can be obtained from primary clarifiers preceding biological reactors. Alternatively, the incoming wastewater can be sent to a very-high-loaded activated sludge system, i.e., a so-called A-stage. However, the effects of applying an A-stage instead of a primary clarifier, on the subsequent sludge digestion for long-term operation is still unknown. In this study, biogas production and permeate quality, and filterability characteristics were investigated in a lab-scale anaerobic membrane bioreactor for primary sludge and A-stage sludge (A-sludge) treatment. A higher specific methane yield was obtained from digestion of A-sludge compared to primary sludge. Similarly, specific methanogenic activity was higher when the anaerobic membrane bioreactor was fed with A-sludge compared to primary sludge. Plant-wide mass balance analysis indicated that about 35% of the organic matter in wastewater was recovered as methane by including an A-stage, compared to about 20% with a primary clarifier.
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