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PVA-gel beads enhance granule formation in a UASB reactor
- Source :
- Bioresource technology. 99(17)
- Publication Year :
- 2007
-
Abstract
- PVA-gel beads were used as a biocarrier in a lab-scale UASB reactor treating synthetic wastewater composed of corn steep liquor (CSL) with the aim of evaluating its use as a growth nucleus to enhance granule formation. Over 117 days of operation, the organic loading rate was increased to 22.5 kg COD/m 3 /day with an influent COD of about 10.8 g/L at an HRT of 12 h with COD removal efficiencies greater than 87%. By the end of the study period, the PVA-gel turned black and granule formation was achieved as compared with the formation of much fewer natural granules without the PVA-gel nucleus. No filamentous bacteria were found on the surface or interior of the PVA-gel beads. The PVA-gel granules had an average settling velocity 200 m/h (5 cm/s), and a biomass attachment of 0.93 g VSS/g PVA-gel. The required time for formation of PVA-gel granules was thus demonstrated to be shorter than that of ordinary sludge granules under the experimental conditions used in this study.
- Subjects :
- Environmental Engineering
Chromatography
integumentary system
Bacteria
Sewage
Renewable Energy, Sustainability and the Environment
Chemistry
Segmented filamentous bacteria
Granule (cell biology)
Fatty Acids
Bioengineering
General Medicine
Corn steep liquor
Microspheres
Bioreactors
Wastewater
Settling
Chemical engineering
Polyvinyl Alcohol
Loading rate
Gases
Volatilization
Waste Management and Disposal
Gels
Subjects
Details
- ISSN :
- 09608524
- Volume :
- 99
- Issue :
- 17
- Database :
- OpenAIRE
- Journal :
- Bioresource technology
- Accession number :
- edsair.doi.dedup.....2bbbbd19f589c3c0fc9010c808d57632