High-Rate Moving-Bed Biofilm Anaerobic Digestion for Waste Activated Sludge Treatment
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- Van Anh NGO
- Faculty of Environmental Engineering, the University of Kitakyushu, Japan
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- Thi Huyen VUONG
- Faculty of Environmental Engineering, the University of Kitakyushu, Japan
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- Van Chie LE
- Research Center for Environmental Technology and Sustainable Development, VNU University of Science, Vietnam
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- Thi Ha NGUYEN
- Faculty of Environmental Science, VNU University of Science, Vietnam
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- TERASHIMA Mitsuharu
- Faculty of Environmental Engineering, the University of Kitakyushu, Japan
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- YASUI Hidenari
- Faculty of Environmental Engineering, the University of Kitakyushu, Japan
Abstract
In a mesophilic anaerobic digestion process, decayed waste activated sludge biomass fed to a digester formed soluble COD substrates, which were eventually converted to methane by anaerobic microorganisms. To improve the decomposition of the soluble materials, performance of a high-rate anaerobic digester was experimentally evaluated. A lab-scale moving-bed biofilm digester having 83.33 m2-carrier surface/m3-reactor was operated for 200 days with decreasing HRT from 20 days to 1 day, while comparing its response to a conventional chemostat digester. Although both reactors gave a comparable methane production until a 15-day HRT, the soluble TOC in the chemostat digester elevated to 3,000 mg/L at 4-day HRT suggesting washout of the anaerobic microorganisms. On the other hand, the moving-bed biofilm digester kept a reasonable methane production rate without accumulation of the soluble materials until 3-day HRT. When the HRT was reduced to 2 days, the soluble fraction decreased due to limited production of the decayed materials. To simulate the responses, an extended IWA-Activated Sludge Model was applied and individual kinetics were estimated. The simulation demonstrated that the relevant active anaerobic biomass (acidogens and methanogens) accumulated in the moving-bed biofilm digester showing high TVS digestion efficiency (25%) at even very short HRT.
Journal
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- Journal of Water and Environment Technology
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Journal of Water and Environment Technology 12 (6), 501-509, 2014
Japan Society on Water Environment
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Details 詳細情報について
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- CRID
- 1390282680157591424
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- NII Article ID
- 130004704330
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- ISSN
- 13482165
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed